diff --git a/plugins/clang/duchain/parsesession.cpp b/plugins/clang/duchain/parsesession.cpp
index a81340f881..a3f0714556 100644
--- a/plugins/clang/duchain/parsesession.cpp
+++ b/plugins/clang/duchain/parsesession.cpp
@@ -1,505 +1,510 @@
 /*
     This file is part of KDevelop
 
     Copyright 2013 Olivier de Gaalon <olivier.jg@gmail.com>
     Copyright 2013 Milian Wolff <mail@milianw.de>
     Copyright 2013 Kevin Funk <kfunk@kde.org>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Library General Public License for more details.
 
     You should have received a copy of the GNU Library General Public License
     along with this library; see the file COPYING.LIB.  If not, write to
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 */
 
 #include "parsesession.h"
 #include <QStandardPaths>
 #include "clangproblem.h"
 #include "clangdiagnosticevaluator.h"
 #include "todoextractor.h"
 #include "clanghelpers.h"
 #include "clangindex.h"
 #include "clangparsingenvironment.h"
 #include "util/clangdebug.h"
 #include "util/clangtypes.h"
 #include "util/clangutils.h"
 
 #include <language/duchain/duchainlock.h>
 #include <language/duchain/duchain.h>
 
 #include <KShell>
 
 #include <QDir>
 #include <QFileInfo>
 #include <QMimeDatabase>
 #include <QMimeType>
 
 #include <algorithm>
 
 using namespace KDevelop;
 
 namespace {
 
 QVector<QByteArray> extraArgs()
 {
     const auto extraArgsString = QString::fromLatin1(qgetenv("KDEV_CLANG_EXTRA_ARGUMENTS"));
     const auto extraArgs = KShell::splitArgs(extraArgsString);
 
     // transform to list of QByteArrays
     QVector<QByteArray> result;
     result.reserve(extraArgs.size());
     foreach (const QString& arg, extraArgs) {
         result << arg.toLatin1();
     }
     clangDebug() << "Passing extra arguments to clang:" << result;
 
     return result;
 }
 
 QVector<QByteArray> argsForSession(const QString& path, ParseSessionData::Options options, const ParserSettings& parserSettings)
 {
     QMimeDatabase db;
     if(db.mimeTypeForFile(path).name() == QStringLiteral("text/x-objcsrc")) {
         return {QByteArrayLiteral("-xobjective-c++")};
     }
 
     // TODO: No proper mime type detection possible yet
     // cf. https://bugs.freedesktop.org/show_bug.cgi?id=26913
     if (path.endsWith(QLatin1String(".cl"), Qt::CaseInsensitive)) {
         return {QByteArrayLiteral("-xcl")};
     }
 
     // TODO: No proper mime type detection possible yet
     // cf. https://bugs.freedesktop.org/show_bug.cgi?id=23700
     if (path.endsWith(QLatin1String(".cu"), Qt::CaseInsensitive)) {
         return {QByteArrayLiteral("-xcuda")};
     }
 
     if (parserSettings.parserOptions.isEmpty()) {
         // The parserOptions can be empty for some unit tests that use ParseSession directly
         auto defaultArguments = ClangSettingsManager::self()->parserSettings(path).toClangAPI();
         defaultArguments.append(QByteArrayLiteral("-nostdinc"));
         defaultArguments.append(QByteArrayLiteral("-nostdinc++"));
         defaultArguments.append(QByteArrayLiteral("-xc++"));
         return defaultArguments;
     }
 
     auto result = parserSettings.toClangAPI();
     result.append(QByteArrayLiteral("-nostdinc"));
     if (parserSettings.isCpp()) {
         result.append(QByteArrayLiteral("-nostdinc++"));
     }
 
     if (options & ParseSessionData::PrecompiledHeader) {
         result.append(parserSettings.isCpp() ? QByteArrayLiteral("-xc++-header") : QByteArrayLiteral("-xc-header"));
         return result;
     }
 
     result.append(parserSettings.isCpp() ? QByteArrayLiteral("-xc++") : QByteArrayLiteral("-xc"));
     return result;
 }
 
 void addIncludes(QVector<const char*>* args, QVector<QByteArray>* otherArgs,
                  const Path::List& includes, const char* cliSwitch)
 {
     foreach (const Path& url, includes) {
         if (url.isEmpty()) {
             continue;
         }
         
         QFileInfo info(url.toLocalFile());
         QByteArray path = url.toLocalFile().toUtf8();
 
         if (info.isFile()) {
             path.prepend("-include");
         } else {
             path.prepend(cliSwitch);
         }
         otherArgs->append(path);
         args->append(path.constData());
     }
 }
 
 void addFrameworkDirectories(QVector<const char*>* args, QVector<QByteArray>* otherArgs,
                  const Path::List& frameworkDirectories, const char* cliSwitch)
 {
     foreach (const Path& url, frameworkDirectories) {
         if (url.isEmpty()) {
             continue;
         }
 
         QFileInfo info(url.toLocalFile());
         if (!info.isDir()) {
             qCWarning(KDEV_CLANG) << "supposed framework directory is not a directory:" << url.pathOrUrl();
             continue;
         }
         QByteArray path = url.toLocalFile().toUtf8();
 
         otherArgs->append(cliSwitch);
         otherArgs->append(path);
         args->append(cliSwitch);
         args->append(path.constData());
     }
 }
 
 QVector<CXUnsavedFile> toClangApi(const QVector<UnsavedFile>& unsavedFiles)
 {
     QVector<CXUnsavedFile> unsaved;
     unsaved.reserve(unsavedFiles.size());
     std::transform(unsavedFiles.begin(), unsavedFiles.end(),
                 std::back_inserter(unsaved),
                 [] (const UnsavedFile& file) { return file.toClangApi(); });
     return unsaved;
 }
 
 bool needGccCompatibility(const ClangParsingEnvironment& environment)
 {
     const auto& defines = environment.defines();
     // TODO: potentially do the same for the intel compiler?
     return defines.contains(QStringLiteral("__GNUC__"))
         && !environment.defines().contains(QStringLiteral("__clang__"));
 }
 
 bool hasQtIncludes(const Path::List& includePaths)
 {
     return std::find_if(includePaths.begin(), includePaths.end(), [] (const Path& path) {
         return path.lastPathSegment() == QLatin1String("QtCore");
     }) != includePaths.end();
 }
 
 }
 
 ParseSessionData::ParseSessionData(const QVector<UnsavedFile>& unsavedFiles, ClangIndex* index,
                                    const ClangParsingEnvironment& environment, Options options)
     : m_file(nullptr)
     , m_unit(nullptr)
 {
     unsigned int flags = CXTranslationUnit_DetailedPreprocessingRecord
 #if CINDEX_VERSION_MINOR >= 34
         | CXTranslationUnit_KeepGoing
 #endif
     ;
     if (options.testFlag(SkipFunctionBodies)) {
         flags |= CXTranslationUnit_SkipFunctionBodies;
     }
     if (options.testFlag(PrecompiledHeader)) {
         flags |= CXTranslationUnit_ForSerialization;
     } else {
         flags |= CXTranslationUnit_CacheCompletionResults
 #if CINDEX_VERSION_MINOR >= 32
               |  CXTranslationUnit_CreatePreambleOnFirstParse
 #endif
               |  CXTranslationUnit_PrecompiledPreamble;
         if (environment.quality() == ClangParsingEnvironment::Unknown) {
             flags |= CXTranslationUnit_Incomplete;
         }
     }
 
     const auto tuUrl = environment.translationUnitUrl();
     Q_ASSERT(!tuUrl.isEmpty());
 
     const auto arguments = argsForSession(tuUrl.str(), options, environment.parserSettings());
     QVector<const char*> clangArguments;
 
     const auto& includes = environment.includes();
     const auto& pchInclude = environment.pchInclude();
 
     // uses QByteArray as smart-pointer for const char* ownership
     QVector<QByteArray> smartArgs;
     smartArgs.reserve(includes.system.size() + includes.project.size()
                       + pchInclude.isValid() + arguments.size() + 1);
     clangArguments.reserve(smartArgs.size());
 
     std::transform(arguments.constBegin(), arguments.constEnd(),
                    std::back_inserter(clangArguments),
                    [] (const QByteArray &argument) { return argument.constData(); });
 
     // NOTE: the PCH include must come before all other includes!
     if (pchInclude.isValid()) {
         clangArguments << "-include";
         QByteArray pchFile = pchInclude.toLocalFile().toUtf8();
         smartArgs << pchFile;
         clangArguments << pchFile.constData();
     }
 
     if (needGccCompatibility(environment)) {
         const auto compatFile = QStandardPaths::locate(QStandardPaths::GenericDataLocation, QStringLiteral("kdevclangsupport/gcc_compat.h")).toUtf8();
         if (!compatFile.isEmpty()) {
             smartArgs << compatFile;
             clangArguments << "-include" << compatFile.constData();
         }
     }
 
     if (hasQtIncludes(includes.system)) {
         const auto wrappedQtHeaders = QStandardPaths::locate(QStandardPaths::GenericDataLocation,
                                                              QStringLiteral("kdevclangsupport/wrappedQtHeaders"),
                                                              QStandardPaths::LocateDirectory).toUtf8();
         if (!wrappedQtHeaders.isEmpty()) {
             smartArgs << wrappedQtHeaders;
             clangArguments << "-isystem" << wrappedQtHeaders.constData();
             const QByteArray qtCore = wrappedQtHeaders + "/QtCore";
             smartArgs << qtCore;
             clangArguments << "-isystem" << qtCore.constData();
         }
     }
 
     addIncludes(&clangArguments, &smartArgs, includes.system, "-isystem");
     addIncludes(&clangArguments, &smartArgs, includes.project, "-I");
 
     const auto& frameworkDirectories = environment.frameworkDirectories();
     addFrameworkDirectories(&clangArguments, &smartArgs, frameworkDirectories.system, "-iframework");
     addFrameworkDirectories(&clangArguments, &smartArgs, frameworkDirectories.project, "-F");
 
     smartArgs << writeDefinesFile(environment.defines());
     clangArguments << "-imacros" << smartArgs.last().constData();
 
     // append extra args from environment variable
     static const auto extraArgs = ::extraArgs();
     foreach (const QByteArray& arg, extraArgs) {
         clangArguments << arg.constData();
     }
 
     QVector<CXUnsavedFile> unsaved;
     //For PrecompiledHeader, we don't want unsaved contents (and contents.isEmpty())
     if (!options.testFlag(PrecompiledHeader)) {
         unsaved = toClangApi(unsavedFiles);
     }
 
     // debugging: print hypothetical clang invocation including args (for easy c&p for local testing)
     if (qEnvironmentVariableIsSet("KDEV_CLANG_DISPLAY_ARGS")) {
         QTextStream out(stdout);
         out << "Invocation: clang";
         foreach (const auto& arg, clangArguments) {
             out << " " << arg;
         }
         out << " " << tuUrl.byteArray().constData() << "\n";
     }
 
     const CXErrorCode code = clang_parseTranslationUnit2(
         index->index(), tuUrl.byteArray().constData(),
         clangArguments.constData(), clangArguments.size(),
         unsaved.data(), unsaved.size(),
         flags,
         &m_unit
     );
     if (code != CXError_Success) {
         qCWarning(KDEV_CLANG) << "clang_parseTranslationUnit2 return with error code" << code;
         if (!qEnvironmentVariableIsSet("KDEV_CLANG_DISPLAY_DIAGS")) {
             qCWarning(KDEV_CLANG) << "  (start KDevelop with `KDEV_CLANG_DISPLAY_DIAGS=1 kdevelop` to see more diagnostics)";
         }
     }
 
     if (m_unit) {
         setUnit(m_unit);
         m_environment = environment;
 
         if (options.testFlag(PrecompiledHeader)) {
             clang_saveTranslationUnit(m_unit, QByteArray(tuUrl.byteArray() + ".pch").constData(), CXSaveTranslationUnit_None);
         }
     } else {
         qCWarning(KDEV_CLANG) << "Failed to parse translation unit:" << tuUrl;
     }
 }
 
 ParseSessionData::~ParseSessionData()
 {
     clang_disposeTranslationUnit(m_unit);
 }
 
 QByteArray ParseSessionData::writeDefinesFile(const QMap<QString, QString>& defines)
 {
     m_definesFile.open();
     Q_ASSERT(m_definesFile.isWritable());
 
     {
         QTextStream definesStream(&m_definesFile);
         // don't show warnings about redefined macros
         definesStream << "#pragma clang system_header\n";
         for (auto it = defines.begin(); it != defines.end(); ++it) {
+            if (it.key().startsWith(QLatin1String("__has_include("))
+                || it.key().startsWith(QLatin1String("__has_include_next(")))
+            {
+                continue;
+            }
             definesStream << QStringLiteral("#define ") << it.key() << ' ' << it.value() << '\n';
         }
     }
     m_definesFile.close();
 
     if (qEnvironmentVariableIsSet("KDEV_CLANG_DISPLAY_DEFINES")) {
         QFile f(m_definesFile.fileName());
         f.open(QIODevice::ReadOnly);
         Q_ASSERT(f.isReadable());
         QTextStream out(stdout);
         out << "Defines file: " << f.fileName() << "\n"
             << f.readAll() << f.size()
             << "\n VS defines:" << defines.size() << "\n";
     }
 
     return m_definesFile.fileName().toUtf8();
 }
 
 void ParseSessionData::setUnit(CXTranslationUnit unit)
 {
     m_unit = unit;
     if (m_unit) {
         const ClangString unitFile(clang_getTranslationUnitSpelling(unit));
         m_file = clang_getFile(m_unit, unitFile.c_str());
     } else {
         m_file = nullptr;
     }
 }
 
 ClangParsingEnvironment ParseSessionData::environment() const
 {
     return m_environment;
 }
 
 ParseSession::ParseSession(const ParseSessionData::Ptr& data)
     : d(data)
 {
     if (d) {
         ENSURE_CHAIN_NOT_LOCKED
         d->m_mutex.lock();
     }
 }
 
 ParseSession::~ParseSession()
 {
     if (d) {
         d->m_mutex.unlock();
     }
 }
 
 void ParseSession::setData(const ParseSessionData::Ptr& data)
 {
     if (data == d) {
         return;
     }
 
     if (d) {
         d->m_mutex.unlock();
     }
 
     d = data;
 
     if (d) {
         ENSURE_CHAIN_NOT_LOCKED
         d->m_mutex.lock();
     }
 }
 
 ParseSessionData::Ptr ParseSession::data() const
 {
     return d;
 }
 
 IndexedString ParseSession::languageString()
 {
     static const IndexedString lang("Clang");
     return lang;
 }
 
 QList<ProblemPointer> ParseSession::problemsForFile(CXFile file) const
 {
     if (!d) {
         return {};
     }
 
     QList<ProblemPointer> problems;
 
     // extra clang diagnostics
     const uint numDiagnostics = clang_getNumDiagnostics(d->m_unit);
     problems.reserve(numDiagnostics);
     for (uint i = 0; i < numDiagnostics; ++i) {
         auto diagnostic = clang_getDiagnostic(d->m_unit, i);
 
         CXSourceLocation location = clang_getDiagnosticLocation(diagnostic);
         CXFile diagnosticFile;
         clang_getFileLocation(location, &diagnosticFile, nullptr, nullptr, nullptr);
         // missing-include problems are so severe in clang that we always propagate
         // them to this document, to ensure that the user will see the error.
         if (diagnosticFile != file && ClangDiagnosticEvaluator::diagnosticType(diagnostic) != ClangDiagnosticEvaluator::IncludeFileNotFoundProblem) {
             continue;
         }
 
         ProblemPointer problem(ClangDiagnosticEvaluator::createProblem(diagnostic, d->m_unit));
         problems << problem;
 
         clang_disposeDiagnostic(diagnostic);
     }
 
     // other problem sources
 
     TodoExtractor extractor(unit(), file);
     problems << extractor.problems();
 
 #if CINDEX_VERSION_MINOR > 30
     // note that the below warning is triggered on every reparse when there is a precompiled preamble
     // see also TestDUChain::testReparseIncludeGuard
     const QString path = QDir(ClangString(clang_getFileName(file)).toString()).canonicalPath();
     const IndexedString indexedPath(path);
     if (ClangHelpers::isHeader(path) && !clang_isFileMultipleIncludeGuarded(unit(), file)
         && !clang_Location_isInSystemHeader(clang_getLocationForOffset(d->m_unit, file, 0)))
     {
         ProblemPointer problem(new Problem);
         problem->setSeverity(IProblem::Warning);
         problem->setDescription(i18n("Header is not guarded against multiple inclusions"));
         problem->setExplanation(i18n("The given header is not guarded against multiple inclusions, "
             "either with the conventional #ifndef/#define/#endif macro guards or with #pragma once."));
         problem->setFinalLocation({indexedPath, KTextEditor::Range()});
         problem->setSource(IProblem::Preprocessor);
         problems << problem;
         // TODO: Easy to add an assistant here that adds the guards -- any takers?
     }
 #endif
 
     return problems;
 }
 
 CXTranslationUnit ParseSession::unit() const
 {
     return d ? d->m_unit : nullptr;
 }
 
 CXFile ParseSession::file(const QByteArray& path) const
 {
     return clang_getFile(unit(), path.constData());
 }
 
 CXFile ParseSession::mainFile() const
 {
     return d ? d->m_file : nullptr;
 }
 
 bool ParseSession::reparse(const QVector<UnsavedFile>& unsavedFiles, const ClangParsingEnvironment& environment)
 {
     if (!d || environment != d->m_environment) {
         return false;
     }
 
     auto unsaved = toClangApi(unsavedFiles);
 
     const auto code = clang_reparseTranslationUnit(d->m_unit, unsaved.size(), unsaved.data(),
                                                    clang_defaultReparseOptions(d->m_unit));
     if (code != CXError_Success) {
         qCWarning(KDEV_CLANG) << "clang_reparseTranslationUnit return with error code" << code;
         // if error code != 0 => clang_reparseTranslationUnit invalidates the old translation unit => clean up
         clang_disposeTranslationUnit(d->m_unit);
         d->setUnit(nullptr);
         return false;
     }
 
     // update state
     d->setUnit(d->m_unit);
     return true;
 }
 
 ClangParsingEnvironment ParseSession::environment() const
 {
     return d->m_environment;
 }
diff --git a/plugins/clang/tests/test_duchain.cpp b/plugins/clang/tests/test_duchain.cpp
index f2d3ba3692..92e263a56a 100644
--- a/plugins/clang/tests/test_duchain.cpp
+++ b/plugins/clang/tests/test_duchain.cpp
@@ -1,2029 +1,2072 @@
 /*
  * Copyright 2014  Milian Wolff <mail@milianw.de>
  * Copyright 2014  Kevin Funk <kfunk@kde.org>
  * Copyright 2015  Sergey Kalinichev <kalinichev.so.0@gmail.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License or (at your option) version 3 or any later version
  * accepted by the membership of KDE e.V. (or its successor approved
  * by the membership of KDE e.V.), which shall act as a proxy
  * defined in Section 14 of version 3 of the license.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "test_duchain.h"
 
 #include <tests/testcore.h>
 #include <tests/autotestshell.h>
 #include <tests/testfile.h>
 #include <tests/testproject.h>
 #include <language/duchain/duchainlock.h>
 #include <language/duchain/duchain.h>
 #include <language/duchain/declaration.h>
 #include <language/duchain/parsingenvironment.h>
 #include <language/duchain/problem.h>
 #include <language/duchain/types/integraltype.h>
 #include <language/duchain/types/structuretype.h>
 #include <language/duchain/types/functiontype.h>
 #include <language/duchain/types/typealiastype.h>
 #include <language/duchain/duchainutils.h>
 #include <language/duchain/classdeclaration.h>
 #include <language/duchain/abstractfunctiondeclaration.h>
 #include <language/duchain/functiondefinition.h>
 #include <language/duchain/classfunctiondeclaration.h>
 #include <language/duchain/forwarddeclaration.h>
 #include <language/duchain/use.h>
 #include <language/duchain/duchaindumper.h>
 #include <language/backgroundparser/backgroundparser.h>
 #include <interfaces/ilanguagecontroller.h>
 #include <interfaces/idocumentcontroller.h>
 #include <util/kdevstringhandler.h>
 
 #include "duchain/clangparsingenvironmentfile.h"
 #include "duchain/clangparsingenvironment.h"
 #include "duchain/parsesession.h"
 
 #include <custom-definesandincludes/idefinesandincludesmanager.h>
 
 #include <KConfigGroup>
 
 #include <QTest>
 #include <QSignalSpy>
 #include <QLoggingCategory>
 #include <QThread>
 
 QTEST_MAIN(TestDUChain);
 
 using namespace KDevelop;
 
 class TestEnvironmentProvider final : public IDefinesAndIncludesManager::BackgroundProvider
 {
 public:
     ~TestEnvironmentProvider() override = default;
     QHash< QString, QString > definesInBackground(const QString& /*path*/) const override
     {
         return defines;
     }
 
     Path::List includesInBackground(const QString& /*path*/) const override
     {
         return includes;
     }
 
     Path::List frameworkDirectoriesInBackground(const QString&) const override
     {
         return {};
     }
 
     IDefinesAndIncludesManager::Type type() const override
     {
         return IDefinesAndIncludesManager::UserDefined;
     }
 
     QHash<QString, QString> defines;
     Path::List includes;
 };
 
 TestDUChain::~TestDUChain() = default;
 
 void TestDUChain::initTestCase()
 {
     QLoggingCategory::setFilterRules(QStringLiteral("*.debug=false\ndefault.debug=true\nkdevelop.plugins.clang.debug=true\n"));
     QVERIFY(qputenv("KDEV_DISABLE_PLUGINS", "kdevcppsupport"));
     QVERIFY(qputenv("KDEV_CLANG_DISPLAY_DIAGS", "1"));
     AutoTestShell::init({QStringLiteral("kdevclangsupport")});
     auto core = TestCore::initialize();
     delete core->projectController();
     m_projectController = new TestProjectController(core);
     core->setProjectController(m_projectController);
 }
 
 void TestDUChain::cleanupTestCase()
 {
     TestCore::shutdown();
 }
 
 void TestDUChain::cleanup()
 {
     if (m_provider) {
         IDefinesAndIncludesManager::manager()->unregisterBackgroundProvider(m_provider.data());
     }
 }
 
 void TestDUChain::init()
 {
     m_provider.reset(new TestEnvironmentProvider);
     IDefinesAndIncludesManager::manager()->registerBackgroundProvider(m_provider.data());
 }
 
 struct ExpectedComment
 {
     QString identifier;
     QString comment;
 };
 Q_DECLARE_METATYPE(ExpectedComment)
 Q_DECLARE_METATYPE(AbstractType::WhichType)
 
 void TestDUChain::testComments()
 {
     QFETCH(QString, code);
     QFETCH(ExpectedComment, expectedComment);
 
     TestFile file(code, QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     auto top = file.topContext();
     QVERIFY(top);
     auto candidates = top->findDeclarations(QualifiedIdentifier(expectedComment.identifier));
     QVERIFY(!candidates.isEmpty());
     auto decl = candidates.first();
     QString comment = QString::fromLocal8Bit(decl->comment());
     comment = KDevelop::htmlToPlainText(comment, KDevelop::CompleteMode);
     QCOMPARE(comment, expectedComment.comment);
 }
 
 void TestDUChain::testComments_data()
 {
     QTest::addColumn<QString>("code");
     QTest::addColumn<ExpectedComment>("expectedComment");
 
     // note: Clang only retrieves the comments when in doxygen-style format (i.e. '///', '/**', '///<')
     QTest::newRow("invalid1")
         << "//this is foo\nint foo;"
         << ExpectedComment{"foo", QString()};
     QTest::newRow("invalid2")
         << "/*this is foo*/\nint foo;"
         << ExpectedComment{"foo", QString()};
     QTest::newRow("basic1")
         << "///this is foo\nint foo;"
         << ExpectedComment{"foo", "this is foo"};
     QTest::newRow("basic2")
         << "/**this is foo*/\nint foo;"
         << ExpectedComment{"foo", "this is foo"};
     QTest::newRow("enumerator")
         << "enum Foo { bar1, ///<this is bar1\nbar2 ///<this is bar2\n };"
         << ExpectedComment{"Foo::bar1", "this is bar1"};
     QTest::newRow("comment-formatting")
         << "/** a\n * multiline\n *\n * comment\n */ int foo;"
         << ExpectedComment{"foo", "a multiline\ncomment"};
     QTest::newRow("comment-doxygen-tags")
         << "/** @see bar()\n@param a foo\n*/\nvoid foo(int a);\nvoid bar();"
         << ExpectedComment{"foo", "bar()\na\nfoo"};
 }
 
 void TestDUChain::testElaboratedType()
 {
     QFETCH(QString, code);
     QFETCH(AbstractType::WhichType, type);
 
     TestFile file(code, QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     auto top = file.topContext();
     QVERIFY(top);
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
 
     auto decl = file.topContext()->localDeclarations()[1];
     QVERIFY(decl);
 
     auto function = dynamic_cast<FunctionDeclaration*>(decl);
     QVERIFY(function);
 
     auto functionType = function->type<FunctionType>();
     QVERIFY(functionType);
 
 #if CINDEX_VERSION_MINOR < 34
     QEXPECT_FAIL("namespace", "The ElaboratedType is not exposed through the libclang interface, not much we can do here", Abort);
 #endif
     QVERIFY(functionType->returnType()->whichType() != AbstractType::TypeDelayed);
 #if CINDEX_VERSION_MINOR < 34
     QEXPECT_FAIL("typedef", "After using clang_getCanonicalType on ElaboratedType all typedef information get's stripped away", Continue);
 #endif
     QCOMPARE(functionType->returnType()->whichType(), type);
 }
 
 void TestDUChain::testElaboratedType_data()
 {
     QTest::addColumn<QString>("code");
     QTest::addColumn<AbstractType::WhichType>("type");
 
     QTest::newRow("namespace")
         << "namespace NS{struct Type{};} struct NS::Type foo();"
         << AbstractType::TypeStructure;
     QTest::newRow("enum")
         << "enum Enum{}; enum Enum foo();"
         << AbstractType::TypeEnumeration;
     QTest::newRow("typedef")
         << "namespace NS{typedef int type;} NS::type foo();"
         << AbstractType::TypeAlias;
 }
 
 void TestDUChain::testInclude()
 {
     TestFile header(QStringLiteral("int foo() { return 42; }\n"), QStringLiteral("h"));
     // NOTE: header is _not_ explicitly being parsed, instead the impl job does that
 
     TestFile impl("#include \"" + header.url().str() + "\"\n"
                   "int main() { return foo(); }", QStringLiteral("cpp"), &header);
     impl.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     auto implCtx = impl.topContext();
     QVERIFY(implCtx);
 
     DUChainReadLocker lock;
     QCOMPARE(implCtx->localDeclarations().size(), 1);
 
     auto headerCtx = DUChain::self()->chainForDocument(header.url());
     QVERIFY(headerCtx);
     QVERIFY(!headerCtx->parsingEnvironmentFile()->needsUpdate());
     QCOMPARE(headerCtx->localDeclarations().size(), 1);
 
     QVERIFY(implCtx->imports(headerCtx, CursorInRevision(0, 10)));
 
     Declaration* foo = headerCtx->localDeclarations().first();
     QCOMPARE(foo->uses().size(), 1);
     QCOMPARE(foo->uses().begin().key(), impl.url());
     QCOMPARE(foo->uses().begin()->size(), 1);
     QCOMPARE(foo->uses().begin()->first(), RangeInRevision(1, 20, 1, 23));
 }
 
 void TestDUChain::testMissingInclude()
 {
     auto code = R"(
 #pragma once
 #include "missing1.h"
 
 template<class T>
 class A
 {
     T a;
 };
 
 #include "missing2.h"
 
 class B : public A<int>
 {
 };
     )";
 
     // NOTE: This fails and needs fixing. If the include of "missing2.h"
     //       above is commented out, then it doesn't fail. Maybe
     //       clang stops processing when it encounters the second missing
     //       header, or similar.
 
     TestFile header(code, QStringLiteral("h"));
     TestFile impl("#include \"" + header.url().str() + "\"\n", QStringLiteral("cpp"), &header);
     QVERIFY(impl.parseAndWait(TopDUContext::AllDeclarationsContextsAndUses));
 
     DUChainReadLocker lock;
 
     auto top = impl.topContext();
     QVERIFY(top);
 
     QCOMPARE(top->importedParentContexts().count(), 1);
 
     TopDUContext* headerCtx = dynamic_cast<TopDUContext*>(top->importedParentContexts().first().context(top));
     QVERIFY(headerCtx);
     QCOMPARE(headerCtx->url(), header.url());
 
 #if CINDEX_VERSION_MINOR < 34
     QEXPECT_FAIL("", "Second missing header isn't reported", Continue);
 #endif
     QCOMPARE(headerCtx->problems().count(), 2);
 
     QCOMPARE(headerCtx->localDeclarations().count(), 2);
 
     auto a = dynamic_cast<ClassDeclaration*>(headerCtx->localDeclarations().first());
     QVERIFY(a);
 
     auto b = dynamic_cast<ClassDeclaration*>(headerCtx->localDeclarations().last());
     QVERIFY(b);
 
 #if CINDEX_VERSION_MINOR < 34
     QEXPECT_FAIL("", "Base class isn't assigned correctly", Continue);
 #endif
     QCOMPARE(b->baseClassesSize(), 1u);
 
 #if CINDEX_VERSION_MINOR < 34
     // at least the one problem we have should have been propagated
     QCOMPARE(top->problems().count(), 1);
 #else
     // two errors:
     // /tmp/testfile_f32415.h:3:10: error: 'missing1.h' file not found
     // /tmp/testfile_f32415.h:11:10: error: 'missing2.h' file not found
     QCOMPARE(top->problems().count(), 2);
 #endif
 }
 
 QByteArray createCode(const QByteArray& prefix, const int functions)
 {
     QByteArray code;
     code += "#ifndef " + prefix + "_H\n";
     code += "#define " + prefix + "_H\n";
     for (int i = 0; i < functions; ++i) {
         code += "void myFunc_" + prefix + "(int arg1, char arg2, const char* arg3);\n";
     }
     code += "#endif\n";
     return code;
 }
 
 void TestDUChain::testIncludeLocking()
 {
     TestFile header1(createCode("Header1", 1000), QStringLiteral("h"));
     TestFile header2(createCode("Header2", 1000), QStringLiteral("h"));
     TestFile header3(createCode("Header3", 1000), QStringLiteral("h"));
 
     ICore::self()->languageController()->backgroundParser()->setThreadCount(3);
 
     TestFile impl1("#include \"" + header1.url().str() + "\"\n"
                    "#include \"" + header2.url().str() + "\"\n"
                    "#include \"" + header3.url().str() + "\"\n"
                    "int main() { return 0; }", QStringLiteral("cpp"));
 
     TestFile impl2("#include \"" + header2.url().str() + "\"\n"
                    "#include \"" + header1.url().str() + "\"\n"
                    "#include \"" + header3.url().str() + "\"\n"
                    "int main() { return 0; }", QStringLiteral("cpp"));
 
     TestFile impl3("#include \"" + header3.url().str() + "\"\n"
                    "#include \"" + header1.url().str() + "\"\n"
                    "#include \"" + header2.url().str() + "\"\n"
                    "int main() { return 0; }", QStringLiteral("cpp"));
 
     impl1.parse(TopDUContext::AllDeclarationsContextsAndUses);
     impl2.parse(TopDUContext::AllDeclarationsContextsAndUses);
     impl3.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     QVERIFY(impl1.waitForParsed(5000));
     QVERIFY(impl2.waitForParsed(5000));
     QVERIFY(impl3.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(DUChain::self()->chainForDocument(header1.url()));
     QVERIFY(DUChain::self()->chainForDocument(header2.url()));
     QVERIFY(DUChain::self()->chainForDocument(header3.url()));
 }
 
 void TestDUChain::testReparse()
 {
     TestFile file(QStringLiteral("int main() { int i = 42; return i; }"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     DeclarationPointer mainDecl;
     DeclarationPointer iDecl;
     for (int i = 0; i < 3; ++i) {
         QVERIFY(file.waitForParsed(500));
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->childContexts().size(), 1);
         QCOMPARE(file.topContext()->localDeclarations().size(), 1);
         DUContext *exprContext = file.topContext()->childContexts().first()->childContexts().first();
         QCOMPARE(exprContext->localDeclarations().size(), 1);
 
         if (i) {
             QVERIFY(mainDecl);
             QCOMPARE(mainDecl.data(), file.topContext()->localDeclarations().first());
 
             QVERIFY(iDecl);
             QCOMPARE(iDecl.data(), exprContext->localDeclarations().first());
         }
         mainDecl = file.topContext()->localDeclarations().first();
         iDecl = exprContext->localDeclarations().first();
 
         QVERIFY(mainDecl->uses().isEmpty());
         QCOMPARE(iDecl->uses().size(), 1);
         QCOMPARE(iDecl->uses().begin()->size(), 1);
 
         if (i == 1) {
             file.setFileContents(QStringLiteral("int main()\n{\nfloat i = 13; return i - 5;\n}\n"));
         }
 
         file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
     }
 }
 
 void TestDUChain::testReparseError()
 {
     TestFile file(QStringLiteral("int i = 1 / 0;\n"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     for (int i = 0; i < 2; ++i) {
         QVERIFY(file.waitForParsed(500));
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
         if (!i) {
             QCOMPARE(file.topContext()->problems().size(), 1);
             file.setFileContents(QStringLiteral("int i = 0;\n"));
         } else {
             QCOMPARE(file.topContext()->problems().size(), 0);
         }
 
         file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
     }
 }
 
 void TestDUChain::testTemplate()
 {
     TestFile file("template<typename T> struct foo { T bar; };\n"
                   "int main() { foo<int> myFoo; return myFoo.bar; }\n", QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto fooDecl = file.topContext()->localDeclarations().first();
     QVERIFY(fooDecl->internalContext());
     QCOMPARE(fooDecl->internalContext()->localDeclarations().size(), 2);
 
     QCOMPARE(file.topContext()->findDeclarations(QualifiedIdentifier("foo< T >")).size(), 1);
     QCOMPARE(file.topContext()->findDeclarations(QualifiedIdentifier("foo< T >::bar")).size(), 1);
 
     auto mainCtx = file.topContext()->localDeclarations().last()->internalContext()->childContexts().first();
     QVERIFY(mainCtx);
     auto myFoo = mainCtx->localDeclarations().first();
     QVERIFY(myFoo);
     QCOMPARE(myFoo->abstractType()->toString().remove(' '), QStringLiteral("foo<int>"));
 }
 
 void TestDUChain::testNamespace()
 {
     TestFile file("namespace foo { struct bar { int baz; }; }\n"
                   "int main() { foo::bar myBar; }\n", QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto fooDecl = file.topContext()->localDeclarations().first();
     QVERIFY(fooDecl->internalContext());
     QCOMPARE(fooDecl->internalContext()->localDeclarations().size(), 1);
 
     DUContext* top = file.topContext().data();
     DUContext* mainCtx = file.topContext()->childContexts().last();
 
     auto foo = top->localDeclarations().first();
     QCOMPARE(foo->qualifiedIdentifier().toString(), QString("foo"));
 
     DUContext* fooCtx = file.topContext()->childContexts().first();
     QCOMPARE(fooCtx->localScopeIdentifier().toString(), QString("foo"));
     QCOMPARE(fooCtx->scopeIdentifier(true).toString(), QString("foo"));
     QCOMPARE(fooCtx->localDeclarations().size(), 1);
     auto bar = fooCtx->localDeclarations().first();
     QCOMPARE(bar->qualifiedIdentifier().toString(), QString("foo::bar"));
     QCOMPARE(fooCtx->childContexts().size(), 1);
 
     DUContext* barCtx = fooCtx->childContexts().first();
     QCOMPARE(barCtx->localScopeIdentifier().toString(), QString("bar"));
     QCOMPARE(barCtx->scopeIdentifier(true).toString(), QString("foo::bar"));
     QCOMPARE(barCtx->localDeclarations().size(), 1);
     auto baz = barCtx->localDeclarations().first();
     QCOMPARE(baz->qualifiedIdentifier().toString(), QString("foo::bar::baz"));
 
     for (auto ctx : {top, mainCtx}) {
         QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo")).size(), 1);
         QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo::bar")).size(), 1);
         QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo::bar::baz")).size(), 1);
     }
 }
 
 void TestDUChain::testAutoTypeDeduction()
 {
     TestFile file(QStringLiteral(R"(
         const volatile auto foo = 5;
         template<class T> struct myTemplate {};
         myTemplate<myTemplate<int>& > templRefParam;
         auto autoTemplRefParam = templRefParam;
     )"), QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
 
     DUContext* ctx = file.topContext().data();
     QVERIFY(ctx);
     QCOMPARE(ctx->localDeclarations().size(), 4);
     QCOMPARE(ctx->findDeclarations(QualifiedIdentifier("foo")).size(), 1);
     Declaration* decl = ctx->findDeclarations(QualifiedIdentifier(QStringLiteral("foo")))[0];
     QCOMPARE(decl->identifier(), Identifier("foo"));
 #if CINDEX_VERSION_MINOR < 31
     QEXPECT_FAIL("", "No type deduction here unfortunately, missing API in Clang", Continue);
 #endif
     QVERIFY(decl->type<IntegralType>());
 #if CINDEX_VERSION_MINOR < 31
     QCOMPARE(decl->toString(), QStringLiteral("const volatile auto foo"));
 #else
     QCOMPARE(decl->toString(), QStringLiteral("const volatile int foo"));
 #endif
 
     decl = ctx->findDeclarations(QualifiedIdentifier(QStringLiteral("autoTemplRefParam")))[0];
     QVERIFY(decl);
     QVERIFY(decl->abstractType());
 #if CINDEX_VERSION_MINOR < 31
     QEXPECT_FAIL("", "Auto type is not exposed via LibClang", Continue);
 #endif
     QCOMPARE(decl->abstractType()->toString(), QStringLiteral("myTemplate< myTemplate< int >& >"));
 }
 
 void TestDUChain::testTypeDeductionInTemplateInstantiation()
 {
     // see: http://clang-developers.42468.n3.nabble.com/RFC-missing-libclang-query-functions-features-td2504253.html
     TestFile file(QStringLiteral("template<typename T> struct foo { T member; } foo<int> f; auto i = f.member;"), QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
 
     DUContext* ctx = file.topContext().data();
     QVERIFY(ctx);
     QCOMPARE(ctx->localDeclarations().size(), 3);
     Declaration* decl = nullptr;
 
     // check 'foo' declaration
     decl = ctx->localDeclarations()[0];
     QVERIFY(decl);
     QCOMPARE(decl->identifier(), Identifier("foo< T >"));
 
     // check type of 'member' inside declaration-scope
     QCOMPARE(ctx->childContexts().size(), 1);
     DUContext* fooCtx = ctx->childContexts().first();
     QVERIFY(fooCtx);
     // Should there really be two declarations?
     QCOMPARE(fooCtx->localDeclarations().size(), 2);
     decl = fooCtx->localDeclarations()[1];
     QCOMPARE(decl->identifier(), Identifier("member"));
 
     // check type of 'member' in definition of 'f'
     decl = ctx->localDeclarations()[1];
     QCOMPARE(decl->identifier(), Identifier("f"));
     decl = ctx->localDeclarations()[2];
     QCOMPARE(decl->identifier(), Identifier("i"));
 #if CINDEX_VERSION_MINOR < 31
     QEXPECT_FAIL("", "No type deduction here unfortunately, missing API in Clang", Continue);
 #endif
     QVERIFY(decl->type<IntegralType>());
 }
 
 void TestDUChain::testVirtualMemberFunction()
 {
     //Forward-declarations with "struct" or "class" are considered equal, so make sure the override is detected correctly.
     TestFile file(QStringLiteral("struct S {}; struct A { virtual S* ret(); }; struct B : public A { virtual S* ret(); };"), QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     DUContext* top = file.topContext().data();
     QVERIFY(top);
 
     QCOMPARE(top->childContexts().count(), 3);
     QCOMPARE(top->localDeclarations().count(), 3);
     QCOMPARE(top->childContexts()[2]->localDeclarations().count(), 1);
     Declaration* decl = top->childContexts()[2]->localDeclarations()[0];
     QCOMPARE(decl->identifier(), Identifier("ret"));
     QVERIFY(DUChainUtils::getOverridden(decl));
 }
 
 void TestDUChain::testBaseClasses()
 {
     TestFile file(QStringLiteral("class Base {}; class Inherited : public Base {};"), QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     DUContext* top = file.topContext().data();
     QVERIFY(top);
 
     QCOMPARE(top->localDeclarations().count(), 2);
     Declaration* baseDecl = top->localDeclarations().first();
     QCOMPARE(baseDecl->identifier(), Identifier("Base"));
 
     ClassDeclaration* inheritedDecl = dynamic_cast<ClassDeclaration*>(top->localDeclarations()[1]);
     QCOMPARE(inheritedDecl->identifier(), Identifier("Inherited"));
 
     QVERIFY(inheritedDecl);
     QCOMPARE(inheritedDecl->baseClassesSize(), 1u);
 
     QCOMPARE(baseDecl->uses().count(), 1);
     QCOMPARE(baseDecl->uses().first().count(), 1);
     QCOMPARE(baseDecl->uses().first().first(), RangeInRevision(0, 40, 0, 44));
 }
 
 void TestDUChain::testReparseBaseClasses()
 {
     TestFile file(QStringLiteral("struct a{}; struct b : a {};\n"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     for (int i = 0; i < 2; ++i) {
         qDebug() << "run: " << i;
         QVERIFY(file.waitForParsed(500));
         DUChainWriteLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->childContexts().size(), 2);
         QCOMPARE(file.topContext()->childContexts().first()->importers().size(), 1);
         QCOMPARE(file.topContext()->childContexts().last()->importedParentContexts().size(), 1);
 
         QCOMPARE(file.topContext()->localDeclarations().size(), 2);
         auto aDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().first());
         QVERIFY(aDecl);
         QCOMPARE(aDecl->baseClassesSize(), 0u);
         auto bDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().last());
         QVERIFY(bDecl);
         QCOMPARE(bDecl->baseClassesSize(), 1u);
         int distance = 0;
         QVERIFY(bDecl->isPublicBaseClass(aDecl, file.topContext(), &distance));
         QCOMPARE(distance, 1);
 
         file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
     }
 }
 
 void TestDUChain::testReparseBaseClassesTemplates()
 {
     TestFile file(QStringLiteral("template<typename T> struct a{}; struct b : a<int> {};\n"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     for (int i = 0; i < 2; ++i) {
         qDebug() << "run: " << i;
         QVERIFY(file.waitForParsed(500));
         DUChainWriteLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->childContexts().size(), 2);
         QCOMPARE(file.topContext()->childContexts().first()->importers().size(), 1);
         QCOMPARE(file.topContext()->childContexts().last()->importedParentContexts().size(), 1);
 
         QCOMPARE(file.topContext()->localDeclarations().size(), 2);
         auto aDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().first());
         QVERIFY(aDecl);
         QCOMPARE(aDecl->baseClassesSize(), 0u);
         auto bDecl = dynamic_cast<ClassDeclaration*>(file.topContext()->localDeclarations().last());
         QVERIFY(bDecl);
         QCOMPARE(bDecl->baseClassesSize(), 1u);
         int distance = 0;
         QVERIFY(bDecl->isPublicBaseClass(aDecl, file.topContext(), &distance));
         QCOMPARE(distance, 1);
 
         file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
     }
 }
 
 void TestDUChain::testGetInheriters_data()
 {
     QTest::addColumn<QString>("code");
 
     QTest::newRow("inline") << "struct Base { struct Inner {}; }; struct Inherited : Base, Base::Inner {};";
     QTest::newRow("outline") << "struct Base { struct Inner; }; struct Base::Inner {}; struct Inherited : Base, Base::Inner {};";
 }
 
 void TestDUChain::testGetInheriters()
 {
     QFETCH(QString, code);
     TestFile file(code, QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     auto top = file.topContext();
     QVERIFY(top);
     QVERIFY(top->problems().isEmpty());
 
     QCOMPARE(top->localDeclarations().count(), 2);
     Declaration* baseDecl = top->localDeclarations().first();
     QCOMPARE(baseDecl->identifier(), Identifier("Base"));
 
     DUContext* baseCtx = baseDecl->internalContext();
     QVERIFY(baseCtx);
     QCOMPARE(baseCtx->localDeclarations().count(), 1);
 
     Declaration* innerDecl = baseCtx->localDeclarations().first();
     QCOMPARE(innerDecl->identifier(), Identifier("Inner"));
     if (auto forward = dynamic_cast<ForwardDeclaration*>(innerDecl)) {
         innerDecl = forward->resolve(top);
     }
     QVERIFY(dynamic_cast<ClassDeclaration*>(innerDecl));
 
     Declaration* inheritedDecl = top->localDeclarations().last();
     QVERIFY(inheritedDecl);
     QCOMPARE(inheritedDecl->identifier(), Identifier("Inherited"));
 
     uint maxAllowedSteps = uint(-1);
     auto baseInheriters = DUChainUtils::getInheriters(baseDecl, maxAllowedSteps);
     QCOMPARE(baseInheriters, QList<Declaration*>() << inheritedDecl);
 
     maxAllowedSteps = uint(-1);
     auto innerInheriters = DUChainUtils::getInheriters(innerDecl, maxAllowedSteps);
     QCOMPARE(innerInheriters, QList<Declaration*>() << inheritedDecl);
 
     maxAllowedSteps = uint(-1);
     auto inheritedInheriters = DUChainUtils::getInheriters(inheritedDecl, maxAllowedSteps);
     QCOMPARE(inheritedInheriters.count(), 0);
 }
 
 void TestDUChain::testGlobalFunctionDeclaration()
 {
     TestFile file(QStringLiteral("void foo(int arg1, char arg2);\n"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     file.waitForParsed();
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 1);
     QCOMPARE(file.topContext()->childContexts().size(), 1);
     QVERIFY(!file.topContext()->childContexts().first()->inSymbolTable());
 }
 
 void TestDUChain::testFunctionDefinitionVsDeclaration()
 {
     TestFile file(QStringLiteral("void func(); void func() {}\n"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed());
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto funcDecl = file.topContext()->localDeclarations()[0];
     QVERIFY(!funcDecl->isDefinition());
     QVERIFY(!dynamic_cast<FunctionDefinition*>(funcDecl));
     auto funcDef = file.topContext()->localDeclarations()[1];
     QVERIFY(dynamic_cast<FunctionDefinition*>(funcDef));
     QVERIFY(funcDef->isDefinition());
 }
 
 void TestDUChain::testEnsureNoDoubleVisit()
 {
     // On some language construct, we may up visiting the same cursor multiple times
     // Example: "struct SomeStruct {} s;"
     // decl: "SomeStruct SomeStruct " of kind StructDecl (2) in main.cpp@[(1,1),(1,17)]
     // decl: "struct SomeStruct s " of kind VarDecl (9) in main.cpp@[(1,1),(1,19)]
     // decl: "SomeStruct SomeStruct " of kind StructDecl (2) in main.cpp@[(1,1),(1,17)]
     //
     // => We end up visiting the StructDecl twice (or more)
     //    That's because we use clang_visitChildren not just on the translation unit cursor.
     //    Apparently just "recursing" vs. "visiting children explicitly"
     //    results in a different AST traversal
 
     TestFile file(QStringLiteral("struct SomeStruct {} s;\n"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed());
 
     DUChainReadLocker lock;
     auto top = file.topContext();
     QVERIFY(top);
 
     // there should only be one declaration for "SomeStruct"
     auto candidates = top->findDeclarations(QualifiedIdentifier(QStringLiteral("SomeStruct")));
     QCOMPARE(candidates.size(), 1);
 }
 
 void TestDUChain::testParsingEnvironment()
 {
     const TopDUContext::Features features = TopDUContext::AllDeclarationsContextsAndUses;
 
     IndexedTopDUContext indexed;
     ClangParsingEnvironment lastEnv;
     {
         TestFile file(QStringLiteral("int main() {}\n"), QStringLiteral("cpp"));
         auto astFeatures = static_cast<TopDUContext::Features>(features | TopDUContext::AST);
         file.parse(astFeatures);
         file.setKeepDUChainData(true);
         QVERIFY(file.waitForParsed());
 
         DUChainWriteLocker lock;
         auto top = file.topContext();
         QVERIFY(top);
         auto sessionData = ParseSessionData::Ptr(dynamic_cast<ParseSessionData*>(top->ast().data()));
         lock.unlock();
         ParseSession session(sessionData);
         lock.lock();
         QVERIFY(session.data());
         QVERIFY(top);
 
         auto envFile = QExplicitlySharedDataPointer<ClangParsingEnvironmentFile>(
             dynamic_cast<ClangParsingEnvironmentFile*>(file.topContext()->parsingEnvironmentFile().data()));
 
         QCOMPARE(envFile->features(), astFeatures);
         QVERIFY(envFile->featuresSatisfied(astFeatures));
         QCOMPARE(envFile->environmentQuality(), ClangParsingEnvironment::Source);
 
         // if no environment is given, no update should be triggered
         QVERIFY(!envFile->needsUpdate());
 
         // same env should also not trigger a reparse
         ClangParsingEnvironment env = session.environment();
         QCOMPARE(env.quality(), ClangParsingEnvironment::Source);
         QVERIFY(!envFile->needsUpdate(&env));
 
         // but changing the environment should trigger an update
         env.addIncludes(Path::List() << Path(QStringLiteral("/foo/bar/baz")));
         QVERIFY(envFile->needsUpdate(&env));
         envFile->setEnvironment(env);
         QVERIFY(!envFile->needsUpdate(&env));
 
         // setting the environment quality higher should require an update
         env.setQuality(ClangParsingEnvironment::BuildSystem);
         QVERIFY(envFile->needsUpdate(&env));
         envFile->setEnvironment(env);
         QVERIFY(!envFile->needsUpdate(&env));
 
         // changing defines requires an update
         env.addDefines(QHash<QString, QString>{ { "foo", "bar" } });
         QVERIFY(envFile->needsUpdate(&env));
 
         // but only when changing the defines for the envFile's TU
         const auto barTU = IndexedString("bar.cpp");
         const auto oldTU = env.translationUnitUrl();
         env.setTranslationUnitUrl(barTU);
         QCOMPARE(env.translationUnitUrl(), barTU);
         QVERIFY(!envFile->needsUpdate(&env));
         env.setTranslationUnitUrl(oldTU);
         QVERIFY(envFile->needsUpdate(&env));
 
         // update it again
         envFile->setEnvironment(env);
         QVERIFY(!envFile->needsUpdate(&env));
         lastEnv = env;
 
         // now compare against a lower quality environment
         // in such a case, we do not want to trigger an update
         env.setQuality(ClangParsingEnvironment::Unknown);
         env.setTranslationUnitUrl(barTU);
         QVERIFY(!envFile->needsUpdate(&env));
 
         // even when the environment changes
         env.addIncludes(Path::List() << Path(QStringLiteral("/lalalala")));
         QVERIFY(!envFile->needsUpdate(&env));
 
         indexed = top->indexed();
     }
 
     DUChain::self()->storeToDisk();
 
     {
         DUChainWriteLocker lock;
         QVERIFY(!DUChain::self()->isInMemory(indexed.index()));
         QVERIFY(indexed.data());
         QVERIFY(DUChain::self()->environmentFileForDocument(indexed));
         auto envFile = QExplicitlySharedDataPointer<ClangParsingEnvironmentFile>(
             dynamic_cast<ClangParsingEnvironmentFile*>(DUChain::self()->environmentFileForDocument(indexed).data()));
         QVERIFY(envFile);
 
         QCOMPARE(envFile->features(), features);
         QVERIFY(envFile->featuresSatisfied(features));
         QVERIFY(!envFile->needsUpdate(&lastEnv));
         DUChain::self()->removeDocumentChain(indexed.data());
     }
 }
 
 void TestDUChain::testActiveDocumentHasASTAttached()
 {
   const TopDUContext::Features features = TopDUContext::AllDeclarationsContextsAndUses;
 
     IndexedTopDUContext indexed;
     ClangParsingEnvironment lastEnv;
     {
         TestFile file(QStringLiteral("int main() {}\n"), QStringLiteral("cpp"));
         auto astFeatures = static_cast<TopDUContext::Features>(features | TopDUContext::AST);
         file.parse(astFeatures);
         file.setKeepDUChainData(true);
         QVERIFY(file.waitForParsed());
 
         DUChainWriteLocker lock;
         auto top = file.topContext();
         QVERIFY(top);
         auto sessionData = ParseSessionData::Ptr(dynamic_cast<ParseSessionData*>(top->ast().data()));
         lock.unlock();
         ParseSession session(sessionData);
         lock.lock();
         QVERIFY(session.data());
         QVERIFY(top);
         QVERIFY(top->ast());
 
         indexed = top->indexed();
     }
 
     DUChain::self()->storeToDisk();
 
     {
         DUChainWriteLocker lock;
         QVERIFY(!DUChain::self()->isInMemory(indexed.index()));
         QVERIFY(indexed.data());
     }
 
     QUrl url;
     {
         DUChainReadLocker lock;
         auto ctx = indexed.data();
         QVERIFY(ctx);
         QVERIFY(!ctx->ast());
         url = ctx->url().toUrl();
     }
 
     QVERIFY(!QFileInfo::exists(url.toLocalFile()));
     QFile file(url.toLocalFile());
     file.open(QIODevice::WriteOnly);
     Q_ASSERT(file.isOpen());
 
     auto document = ICore::self()->documentController()->openDocument(url);
     QVERIFY(document);
     ICore::self()->documentController()->activateDocument(document);
 
     QApplication::processEvents();
     ICore::self()->languageController()->backgroundParser()->parseDocuments();
     QThread::sleep(1);
 
     document->close(KDevelop::IDocument::Discard);
     {
         DUChainReadLocker lock;
         auto ctx = indexed.data();
         QVERIFY(ctx);
         QVERIFY(ctx->ast());
     }
 
     DUChainWriteLocker lock;
     DUChain::self()->removeDocumentChain(indexed.data());
 }
 
 void TestDUChain::testActiveDocumentsGetBestPriority()
 {
     // note: this test would make more sense in kdevplatform, but we don't have a language plugin available there
     // (required for background parsing)
     // TODO: Create a fake-language plugin in kdevplatform for testing purposes, use that.
 
     TestFile file1(QStringLiteral("int main() {}\n"), QStringLiteral("cpp"));
     TestFile file2(QStringLiteral("int main() {}\n"), QStringLiteral("cpp"));
     TestFile file3(QStringLiteral("int main() {}\n"), QStringLiteral("cpp"));
 
     DUChain::self()->storeToDisk();
 
     auto backgroundParser = ICore::self()->languageController()->backgroundParser();
     QVERIFY(!backgroundParser->isQueued(file1.url()));
 
     auto documentController = ICore::self()->documentController();
 
     // open first document (no activation)
     auto doc = documentController->openDocument(file1.url().toUrl(), KTextEditor::Range::invalid(), {IDocumentController::DoNotActivate});
     QVERIFY(doc);
     QVERIFY(backgroundParser->isQueued(file1.url()));
     QCOMPARE(backgroundParser->priorityForDocument(file1.url()), (int)BackgroundParser::NormalPriority);
 
     // open second document, activate
     doc = documentController->openDocument(file2.url().toUrl());
     QVERIFY(doc);
     QVERIFY(backgroundParser->isQueued(file2.url()));
     QCOMPARE(backgroundParser->priorityForDocument(file2.url()), (int)BackgroundParser::BestPriority);
 
     // open third document, activate, too
     doc = documentController->openDocument(file3.url().toUrl());
     QVERIFY(doc);
     QVERIFY(backgroundParser->isQueued(file3.url()));
     QCOMPARE(backgroundParser->priorityForDocument(file3.url()), (int)BackgroundParser::BestPriority);
 }
 
 void TestDUChain::testSystemIncludes()
 {
     ClangParsingEnvironment env;
 
     Path::List projectIncludes = {
         Path("/projects/1"),
         Path("/projects/1/sub"),
         Path("/projects/2"),
         Path("/projects/2/sub")
     };
     env.addIncludes(projectIncludes);
     auto includes = env.includes();
     // no project paths set, so everything is considered a system include
     QCOMPARE(includes.system, projectIncludes);
     QVERIFY(includes.project.isEmpty());
 
     Path::List systemIncludes = {
         Path("/sys"),
         Path("/sys/sub")
     };
     env.addIncludes(systemIncludes);
     includes = env.includes();
     QCOMPARE(includes.system, projectIncludes + systemIncludes);
     QVERIFY(includes.project.isEmpty());
 
     Path::List projects = {
         Path("/projects/1"),
         Path("/projects/2")
     };
     env.setProjectPaths(projects);
     // now the list should be properly separated
     QCOMPARE(env.projectPaths(), projects);
     includes = env.includes();
     QCOMPARE(includes.system, systemIncludes);
     QCOMPARE(includes.project, projectIncludes);
 }
 
 void TestDUChain::benchDUChainBuilder()
 {
     QBENCHMARK_ONCE {
         TestFile file(
             "#include <vector>\n"
             "#include <map>\n"
             "#include <set>\n"
             "#include <algorithm>\n"
             "#include <functional>\n"
             "#include <limits>\n"
             "#include <bitset>\n"
             "#include <iostream>\n"
             "#include <string>\n"
             "#include <mutex>\n", QStringLiteral("cpp"));
         file.parse(TopDUContext::AllDeclarationsContextsAndUses);
         QVERIFY(file.waitForParsed(60000));
 
         DUChainReadLocker lock;
         auto top = file.topContext();
         QVERIFY(top);
     }
 }
 
 void TestDUChain::testReparseWithAllDeclarationsContextsAndUses()
 {
     TestFile file(QStringLiteral("int foo() { return 0; } int main() { return foo(); }"), QStringLiteral("cpp"));
     file.parse(TopDUContext::VisibleDeclarationsAndContexts);
 
     QVERIFY(file.waitForParsed(1000));
 
     {
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->childContexts().size(), 2);
         QCOMPARE(file.topContext()->localDeclarations().size(), 2);
 
         auto dec = file.topContext()->localDeclarations().at(0);
         QEXPECT_FAIL("", "Skipping of function bodies is disabled for now", Continue);
         QVERIFY(dec->uses().isEmpty());
     }
 
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     QVERIFY(file.waitForParsed(500));
 
     {
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->childContexts().size(), 2);
         QCOMPARE(file.topContext()->localDeclarations().size(), 2);
 
         auto mainDecl = file.topContext()->localDeclarations()[1];
         QVERIFY(mainDecl->uses().isEmpty());
         auto foo = file.topContext()->localDeclarations().first();
         QCOMPARE(foo->uses().size(), 1);
     }
 }
 
 void TestDUChain::testReparseOnDocumentActivated()
 {
     TestFile file(QStringLiteral("int foo() { return 0; } int main() { return foo(); }"), QStringLiteral("cpp"));
     file.parse(TopDUContext::VisibleDeclarationsAndContexts);
 
     QVERIFY(file.waitForParsed(1000));
 
     {
         DUChainReadLocker lock;
         auto ctx = file.topContext();
         QVERIFY(ctx);
         QCOMPARE(ctx->childContexts().size(), 2);
         QCOMPARE(ctx->localDeclarations().size(), 2);
 
         auto dec = ctx->localDeclarations().at(0);
         QEXPECT_FAIL("", "Skipping of function bodies was disabled for now", Continue);
         QVERIFY(dec->uses().isEmpty());
 
         QVERIFY(!ctx->ast());
     }
 
     auto backgroundParser = ICore::self()->languageController()->backgroundParser();
     QVERIFY(!backgroundParser->isQueued(file.url()));
 
     auto doc = ICore::self()->documentController()->openDocument(file.url().toUrl());
     QVERIFY(doc);
     QVERIFY(backgroundParser->isQueued(file.url()));
 
     QSignalSpy spy(backgroundParser, &BackgroundParser::parseJobFinished);
     spy.wait();
 
     doc->close(KDevelop::IDocument::Discard);
 
     {
         DUChainReadLocker lock;
         auto ctx = file.topContext();
         QCOMPARE(ctx->features() & TopDUContext::AllDeclarationsContextsAndUses, static_cast<int>(TopDUContext::AllDeclarationsContextsAndUses));
         QVERIFY(ctx->topContext()->ast());
     }
 }
 
 void TestDUChain::testReparseInclude()
 {
     TestFile header(QStringLiteral("int foo() { return 42; }\n"), QStringLiteral("h"));
     TestFile impl("#include \"" + header.url().str() + "\"\n"
                   "int main() { return foo(); }", QStringLiteral("cpp"), &header);
 
     // Use TopDUContext::AST to imitate that document is opened in the editor, so that ClangParseJob can store translation unit, that'll be used for reparsing.
     impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsAndContexts|TopDUContext::AST));
     QVERIFY(impl.waitForParsed(5000));
     {
         DUChainReadLocker lock;
         auto implCtx = impl.topContext();
         QVERIFY(implCtx);
         QCOMPARE(implCtx->importedParentContexts().size(), 1);
     }
 
     impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST));
     QVERIFY(impl.waitForParsed(5000));
 
     DUChainReadLocker lock;
     auto implCtx = impl.topContext();
     QVERIFY(implCtx);
     QCOMPARE(implCtx->localDeclarations().size(), 1);
 
     QCOMPARE(implCtx->importedParentContexts().size(), 1);
 
     auto headerCtx = DUChain::self()->chainForDocument(header.url());
     QVERIFY(headerCtx);
     QVERIFY(!headerCtx->parsingEnvironmentFile()->needsUpdate());
     QCOMPARE(headerCtx->localDeclarations().size(), 1);
 
     QVERIFY(implCtx->imports(headerCtx, CursorInRevision(0, 10)));
 
     Declaration* foo = headerCtx->localDeclarations().first();
     QCOMPARE(foo->uses().size(), 1);
     QCOMPARE(foo->uses().begin().key(), impl.url());
     QCOMPARE(foo->uses().begin()->size(), 1);
     QCOMPARE(foo->uses().begin()->first(), RangeInRevision(1, 20, 1, 23));
 
     QCOMPARE(DUChain::self()->allEnvironmentFiles(header.url()).size(), 1);
     QCOMPARE(DUChain::self()->allEnvironmentFiles(impl.url()).size(), 1);
     QCOMPARE(DUChain::self()->chainsForDocument(header.url()).size(), 1);
     QCOMPARE(DUChain::self()->chainsForDocument(impl.url()).size(), 1);
 }
 
 void TestDUChain::testReparseChangeEnvironment()
 {
     TestFile header(QStringLiteral("int foo() { return 42; }\n"), QStringLiteral("h"));
     TestFile impl("#include \"" + header.url().str() + "\"\n"
                   "int main() { return foo(); }", QStringLiteral("cpp"), &header);
 
     uint hashes[3] = {0, 0, 0};
 
     for (int i = 0; i < 3; ++i) {
         impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
         QVERIFY(impl.waitForParsed(5000));
 
         {
             DUChainReadLocker lock;
             QVERIFY(impl.topContext());
             auto env = dynamic_cast<ClangParsingEnvironmentFile*>(impl.topContext()->parsingEnvironmentFile().data());
             QVERIFY(env);
             QCOMPARE(env->environmentQuality(), ClangParsingEnvironment::Source);
             hashes[i] = env->environmentHash();
             QVERIFY(hashes[i]);
 
             // we should never end up with multiple env files or chains in memory for these files
             QCOMPARE(DUChain::self()->allEnvironmentFiles(impl.url()).size(), 1);
             QCOMPARE(DUChain::self()->chainsForDocument(impl.url()).size(), 1);
             QCOMPARE(DUChain::self()->allEnvironmentFiles(header.url()).size(), 1);
             QCOMPARE(DUChain::self()->chainsForDocument(header.url()).size(), 1);
         }
 
         // in every run, we expect the environment to have changed
         for (int j = 0; j < i; ++j) {
             QVERIFY(hashes[i] != hashes[j]);
         }
 
         if (i == 0) {
             // 1) change defines
             m_provider->defines.insert(QStringLiteral("foooooooo"), QStringLiteral("baaar!"));
         } else if (i == 1) {
             // 2) change includes
             m_provider->includes.append(Path(QStringLiteral("/foo/bar/asdf/lalala")));
         } // 3) stop
     }
 }
 
 void TestDUChain::testMacroDependentHeader()
 {
     TestFile header(QStringLiteral("struct MY_CLASS { class Q{Q(); int m;}; int m; };\n"), QStringLiteral("h"));
     TestFile impl("#define MY_CLASS A\n"
                   "#include \"" + header.url().str() + "\"\n"
                   "#undef MY_CLASS\n"
                   "#define MY_CLASS B\n"
                   "#include \"" + header.url().str() + "\"\n"
                   "#undef MY_CLASS\n"
                   "A a;\n"
                   "const A::Q aq;\n"
                   "B b;\n"
                   "const B::Q bq;\n"
                   "int am = a.m;\n"
                   "int aqm = aq.m;\n"
                   "int bm = b.m;\n"
                   "int bqm = bq.m;\n"
                   , QStringLiteral("cpp"), &header);
 
     impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
     QVERIFY(impl.waitForParsed(500000));
 
     DUChainReadLocker lock;
     TopDUContext* top = impl.topContext().data();
     QVERIFY(top);
     QCOMPARE(top->localDeclarations().size(), 10); // 2x macro, then a, aq, b, bq
     QCOMPARE(top->importedParentContexts().size(), 1);
     AbstractType::Ptr type = top->localDeclarations()[2]->abstractType();
     StructureType* sType = dynamic_cast<StructureType*>(type.data());
     QVERIFY(sType);
     QCOMPARE(sType->toString(), QString("A"));
     Declaration* decl = sType->declaration(top);
     QVERIFY(decl);
     AbstractType::Ptr type2 = top->localDeclarations()[4]->abstractType();
     StructureType* sType2 = dynamic_cast<StructureType*>(type2.data());
     QVERIFY(sType2);
     QCOMPARE(sType2->toString(), QString("B"));
     Declaration* decl2 = sType2->declaration(top);
     QVERIFY(decl2);
 
     TopDUContext* top2 = dynamic_cast<TopDUContext*>(top->importedParentContexts()[0].context(top));
     QVERIFY(top2);
     QCOMPARE(top2->localDeclarations().size(), 2);
     QCOMPARE(top2->localDeclarations()[0], decl);
     QCOMPARE(top2->localDeclarations()[1], decl2);
     qDebug() << "DECL RANGE:" << top2->localDeclarations()[0]->range().castToSimpleRange();
     qDebug() << "CTX RANGE:" << top2->localDeclarations()[0]->internalContext()->range().castToSimpleRange();
 
     // validate uses:
     QCOMPARE(top->usesCount(), 14);
     QCOMPARE(top->uses()[0].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A"));
     QCOMPARE(top->uses()[1].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A"));
     QCOMPARE(top->uses()[2].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A::Q"));
     QCOMPARE(top->uses()[3].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B"));
     QCOMPARE(top->uses()[4].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B"));
     QCOMPARE(top->uses()[5].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B::Q"));
     QCOMPARE(top->uses()[6].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("a"));
     QCOMPARE(top->uses()[7].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A::m"));
     QCOMPARE(top->uses()[8].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("aq"));
     QCOMPARE(top->uses()[9].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("A::Q::m"));
     QCOMPARE(top->uses()[10].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("b"));
     QCOMPARE(top->uses()[11].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B::m"));
     QCOMPARE(top->uses()[12].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("bq"));
     QCOMPARE(top->uses()[13].usedDeclaration(top)->qualifiedIdentifier(), QualifiedIdentifier("B::Q::m"));
 }
 
 void TestDUChain::testHeaderParsingOrder1()
 {
     TestFile header(QStringLiteral("typedef const A<int> B;\n"), QStringLiteral("h"));
     TestFile impl("template<class T> class A{};\n"
                   "#include \"" + header.url().str() + "\"\n"
                   "B c;", QStringLiteral("cpp"), &header);
 
     impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
     QVERIFY(impl.waitForParsed(500000));
 
     DUChainReadLocker lock;
     TopDUContext* top = impl.topContext().data();
     QVERIFY(top);
     QCOMPARE(top->localDeclarations().size(), 2);
     QCOMPARE(top->importedParentContexts().size(), 1);
     AbstractType::Ptr type = top->localDeclarations()[1]->abstractType();
     TypeAliasType* aType = dynamic_cast<TypeAliasType*>(type.data());
     QVERIFY(aType);
     AbstractType::Ptr targetType = aType->type();
     QVERIFY(targetType);
     IdentifiedType *idType = dynamic_cast<IdentifiedType*>(targetType.data());
     QVERIFY(idType);
     // this declaration could be resolved, because it was created with an
     // indirect DeclarationId that is resolved from the perspective of 'top'
     Declaration* decl = idType->declaration(top);
     // NOTE: the decl. doesn't know (yet) about the template insantiation <int>
     QVERIFY(decl);
     QCOMPARE(decl, top->localDeclarations()[0]);
     
     // now ensure that a use was build for 'A' in header1
     TopDUContext* top2 = dynamic_cast<TopDUContext*>(top->importedParentContexts()[0].context(top));
     QVERIFY(top2);
     QEXPECT_FAIL("", "the use could not be created because the corresponding declaration didn't exist yet", Continue);
     QCOMPARE(top2->usesCount(), 1);
     // Declaration* decl2 = top2->uses()[0].usedDeclaration(top2);
     // QVERIFY(decl2);
     // QCOMPARE(decl, decl2);
 }
 
 void TestDUChain::testHeaderParsingOrder2()
 {
     TestFile header(QStringLiteral("template<class T> class A{};\n"), QStringLiteral("h"));
     TestFile header2(QStringLiteral("typedef const A<int> B;\n"), QStringLiteral("h"));
     TestFile impl("#include \"" + header.url().str() + "\"\n"
                   "#include \"" + header2.url().str() + "\"\n"
                   "B c;", QStringLiteral("cpp"), &header);
 
     impl.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
     QVERIFY(impl.waitForParsed(500000));
 
     DUChainReadLocker lock;
     TopDUContext* top = impl.topContext().data();
     QVERIFY(top);
     QCOMPARE(top->localDeclarations().size(), 1);
     QCOMPARE(top->importedParentContexts().size(), 2);
     AbstractType::Ptr type = top->localDeclarations()[0]->abstractType();
     TypeAliasType* aType = dynamic_cast<TypeAliasType*>(type.data());
     QVERIFY(aType);
     AbstractType::Ptr targetType = aType->type();
     QVERIFY(targetType);
     IdentifiedType *idType = dynamic_cast<IdentifiedType*>(targetType.data());
     QVERIFY(idType);
     Declaration* decl = idType->declaration(top);
     // NOTE: the decl. doesn't know (yet) about the template insantiation <int>
     QVERIFY(decl);
     
     // now ensure that a use was build for 'A' in header2
     TopDUContext* top2 = dynamic_cast<TopDUContext*>(top->importedParentContexts()[1].context(top));
     QVERIFY(top2);
     QCOMPARE(top2->usesCount(), 1);
     Declaration* decl2 = top2->uses()[0].usedDeclaration(top2);
     QCOMPARE(decl, decl2);
 }
 
 void TestDUChain::testMacrosRanges()
 {
     TestFile file(QStringLiteral("#define FUNC_MACROS(x) struct str##x{};\nFUNC_MACROS(x);"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto macroDefinition = file.topContext()->localDeclarations()[0];
     QVERIFY(macroDefinition);
     QCOMPARE(macroDefinition->range(), RangeInRevision(0,8,0,19));
     auto structDeclaration = file.topContext()->localDeclarations()[1];
     QVERIFY(structDeclaration);
     QCOMPARE(structDeclaration->range(), RangeInRevision(1,0,1,0));
 
     QCOMPARE(macroDefinition->uses().size(), 1);
     QCOMPARE(macroDefinition->uses().begin()->first(), RangeInRevision(1,0,1,11));
 }
 
 void TestDUChain::testMacroUses()
 {
     TestFile file(QStringLiteral("#define USER(x) x\n#define USED\nUSER(USED)"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto macroDefinition1 = file.topContext()->localDeclarations()[0];
     auto macroDefinition2 = file.topContext()->localDeclarations()[1];
 
     QCOMPARE(macroDefinition1->uses().size(), 1);
     QCOMPARE(macroDefinition1->uses().begin()->first(), RangeInRevision(2,0,2,4));
 #if CINDEX_VERSION_MINOR < 32
     QEXPECT_FAIL("", "This appears to be a clang bug, the AST doesn't contain the macro use", Continue);
 #endif
     QCOMPARE(macroDefinition2->uses().size(), 1);
     if (macroDefinition2->uses().size())
     {
         QCOMPARE(macroDefinition2->uses().begin()->first(), RangeInRevision(2,5,2,9));
     }
 }
 
 void TestDUChain::testMultiLineMacroRanges()
 {
     TestFile file(QStringLiteral("#define FUNC_MACROS(x) struct str##x{};\nFUNC_MACROS(x\n);"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto macroDefinition = file.topContext()->localDeclarations()[0];
     QVERIFY(macroDefinition);
     QCOMPARE(macroDefinition->range(), RangeInRevision(0,8,0,19));
     auto structDeclaration = file.topContext()->localDeclarations()[1];
     QVERIFY(structDeclaration);
     QCOMPARE(structDeclaration->range(), RangeInRevision(1,0,1,0));
 
     QCOMPARE(macroDefinition->uses().size(), 1);
     QCOMPARE(macroDefinition->uses().begin()->first(), RangeInRevision(1,0,1,11));
 }
 
 void TestDUChain::testNestedMacroRanges()
 {
     TestFile file(QStringLiteral("#define INNER int var; var = 0;\n#define MACRO() INNER\nint main(){MACRO(\n);}"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 3);
     auto main = file.topContext()->localDeclarations()[2];
     QVERIFY(main);
     auto mainCtx = main->internalContext()->childContexts().first();
     QVERIFY(mainCtx);
     QCOMPARE(mainCtx->localDeclarations().size(), 1);
     auto var = mainCtx->localDeclarations().first();
     QVERIFY(var);
     QCOMPARE(var->range(), RangeInRevision(2,11,2,11));
 
     QCOMPARE(var->uses().size(), 1);
     QCOMPARE(var->uses().begin()->first(), RangeInRevision(2,11,2,11));
 }
 
 void TestDUChain::testNestedImports()
 {
     TestFile B(QStringLiteral("#pragma once\nint B();\n"), QStringLiteral("h"));
     TestFile C("#pragma once\n#include \"" + B.url().str() + "\"\nint C();\n", QStringLiteral("h"));
     TestFile A("#include \"" + B.url().str() + "\"\n" + "#include \"" + C.url().str() + "\"\nint A();\n", QStringLiteral("cpp"));
 
     A.parse();
     QVERIFY(A.waitForParsed(5000));
 
     DUChainReadLocker lock;
 
     auto BCtx = DUChain::self()->chainForDocument(B.url().toUrl());
     QVERIFY(BCtx);
     QVERIFY(BCtx->importedParentContexts().isEmpty());
 
     auto CCtx = DUChain::self()->chainForDocument(C.url().toUrl());
     QVERIFY(CCtx);
     QCOMPARE(CCtx->importedParentContexts().size(), 1);
     QVERIFY(CCtx->imports(BCtx, CursorInRevision(1, 10)));
 
     auto ACtx = A.topContext();
     QVERIFY(ACtx);
     QCOMPARE(ACtx->importedParentContexts().size(), 2);
     QVERIFY(ACtx->imports(BCtx, CursorInRevision(0, 10)));
     QVERIFY(ACtx->imports(CCtx, CursorInRevision(1, 10)));
 }
 
 void TestDUChain::testEnvironmentWithDifferentOrderOfElements()
 {
     TestFile file(QStringLiteral("int main();\n"), QStringLiteral("cpp"));
 
     m_provider->includes.clear();
     m_provider->includes.append(Path(QStringLiteral("/path1")));
     m_provider->includes.append(Path(QStringLiteral("/path2")));
 
     m_provider->defines.clear();
     m_provider->defines.insert(QStringLiteral("key1"), QStringLiteral("value1"));
     m_provider->defines.insert(QStringLiteral("key2"), QStringLiteral("value2"));
     m_provider->defines.insert(QStringLiteral("key3"), QStringLiteral("value3"));
 
     uint previousHash = 0;
     for (int i: {0, 1, 2, 3}) {
         file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
 
         QVERIFY(file.waitForParsed(5000));
 
         {
             DUChainReadLocker lock;
             QVERIFY(file.topContext());
             auto env = dynamic_cast<ClangParsingEnvironmentFile*>(file.topContext()->parsingEnvironmentFile().data());
             QVERIFY(env);
             QCOMPARE(env->environmentQuality(), ClangParsingEnvironment::Source);
             if (previousHash) {
                 if (i == 3) {
                     QVERIFY(previousHash != env->environmentHash());
                 } else {
                     QCOMPARE(previousHash, env->environmentHash());
                 }
             }
             previousHash = env->environmentHash();
             QVERIFY(previousHash);
         }
 
         if (i == 0) {
             //Change order of defines. Hash of the environment should stay the same.
             m_provider->defines.clear();
             m_provider->defines.insert(QStringLiteral("key3"), QStringLiteral("value3"));
             m_provider->defines.insert(QStringLiteral("key1"), QStringLiteral("value1"));
             m_provider->defines.insert(QStringLiteral("key2"), QStringLiteral("value2"));
         } else if (i == 1) {
             //Add the same macros twice. Hash of the environment should stay the same.
             m_provider->defines.clear();
             m_provider->defines.insert(QStringLiteral("key2"), QStringLiteral("value2"));
             m_provider->defines.insert(QStringLiteral("key3"), QStringLiteral("value3"));
             m_provider->defines.insert(QStringLiteral("key3"), QStringLiteral("value3"));
             m_provider->defines.insert(QStringLiteral("key1"), QStringLiteral("value1"));
         } else if (i == 2) {
             //OTOH order of includes should change hash of the environment.
             m_provider->includes.clear();
             m_provider->includes.append(Path(QStringLiteral("/path2")));
             m_provider->includes.append(Path(QStringLiteral("/path1")));
         }
     }
 }
 
 void TestDUChain::testReparseMacro()
 {
     TestFile file(QStringLiteral("#define DECLARE(a) typedef struct a##_ {} *a;\nDECLARE(D);\nD d;"), QStringLiteral("cpp"));
     file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST));
     QVERIFY(file.waitForParsed(5000));
 
     {
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
     }
 
     file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 5);
 
     auto macroDefinition = file.topContext()->localDeclarations()[0];
     QVERIFY(macroDefinition);
     QCOMPARE(macroDefinition->range(), RangeInRevision(0,8,0,15));
     QCOMPARE(macroDefinition->uses().size(), 1);
     QCOMPARE(macroDefinition->uses().begin()->first(), RangeInRevision(1,0,1,7));
 
     auto structDeclaration = file.topContext()->localDeclarations()[1];
     QVERIFY(structDeclaration);
     QCOMPARE(structDeclaration->range(), RangeInRevision(1,0,1,0));
 
     auto structTypedef = file.topContext()->localDeclarations()[3];
     QVERIFY(structTypedef);
     QCOMPARE(structTypedef->range(), RangeInRevision(1,8,1,9));
     QCOMPARE(structTypedef->uses().size(), 1);
     QCOMPARE(structTypedef->uses().begin()->first(), RangeInRevision(2,0,2,1));
 }
 
 void TestDUChain::testGotoStatement()
 {
     TestFile file(QStringLiteral("int main() {\ngoto label;\ngoto label;\nlabel: return 0;}"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 1);
     auto main = file.topContext()->localDeclarations()[0];
     QVERIFY(main);
     auto mainCtx = main->internalContext()->childContexts().first();
     QVERIFY(mainCtx);
     QCOMPARE(mainCtx->localDeclarations().size(), 1);
     auto label = mainCtx->localDeclarations().first();
     QVERIFY(label);
     QCOMPARE(label->range(), RangeInRevision(3,0,3,5));
 
     QCOMPARE(label->uses().size(), 1);
     QCOMPARE(label->uses().begin()->first(), RangeInRevision(1,5,1,10));
     QCOMPARE(label->uses().begin()->last(), RangeInRevision(2,5,2,10));
 }
 
 void TestDUChain::testRangesOfOperatorsInsideMacro()
 {
     TestFile file(QStringLiteral("class Test{public: Test& operator++(int);};\n#define MACRO(var) var++;\nint main(){\nTest tst; MACRO(tst)}"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 3);
     auto testClass = file.topContext()->localDeclarations()[0];
     QVERIFY(testClass);
     auto operatorPlusPlus = testClass->internalContext()->localDeclarations().first();
     QVERIFY(operatorPlusPlus);
     QCOMPARE(operatorPlusPlus->uses().size(), 1);
     QCOMPARE(operatorPlusPlus->uses().begin()->first(), RangeInRevision(3,10,3,10));
 }
 
 void TestDUChain::testUsesCreatedForDeclarations()
 {
     auto code = R"(template<typename T> void functionTemplate(T);
             template<typename U> void functionTemplate(U) {}
 
             namespace NS { class Class{}; }
             using NS::Class;
 
             Class function();
             NS::Class function() { return {}; }
 
             int main () {
                 functionTemplate(int());
                 function(); }
     )";
     TestFile file(code, QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed());
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
 
     auto functionTemplate = file.topContext()->findDeclarations(QualifiedIdentifier(QStringLiteral("functionTemplate")));
     QVERIFY(!functionTemplate.isEmpty());
     auto functionTemplateDeclaration = DUChainUtils::declarationForDefinition(functionTemplate.first());
     QVERIFY(!functionTemplateDeclaration->isDefinition());
 #if CINDEX_VERSION_MINOR < 29
     QEXPECT_FAIL("", "No API in LibClang to determine function template type", Continue);
 #endif
     QCOMPARE(functionTemplateDeclaration->uses().count(), 1);
 
     auto function = file.topContext()->findDeclarations(QualifiedIdentifier(QStringLiteral("function")));
     QVERIFY(!function.isEmpty());
     auto functionDeclaration = DUChainUtils::declarationForDefinition(function.first());
     QVERIFY(!functionDeclaration->isDefinition());
     QCOMPARE(functionDeclaration->uses().count(), 1);
 }
 
 void TestDUChain::testReparseIncludeGuard()
 {
     TestFile header(QStringLiteral("#ifndef GUARD\n#define GUARD\nint something;\n#endif\n"), QStringLiteral("h"));
     TestFile impl("#include \"" + header.url().str() + "\"\n", QStringLiteral("cpp"), &header);
 
     QVERIFY(impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::AST  )));
     {
         DUChainReadLocker lock;
         QCOMPARE(static_cast<TopDUContext*>(impl.topContext()->
             importedParentContexts().first().context(impl.topContext()))->problems().size(), 0);
     }
     QVERIFY(impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive)));
     {
         DUChainReadLocker lock;
         QCOMPARE(static_cast<TopDUContext*>(impl.topContext()->
             importedParentContexts().first().context(impl.topContext()))->problems().size(), 0);
     }
 }
 
 void TestDUChain::testExternC()
 {
     auto code = R"(extern "C" { void foo(); })";
     TestFile file(code, QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
     QVERIFY(file.waitForParsed());
 
     DUChainReadLocker lock;
     auto top = file.topContext();
     QVERIFY(top);
     QVERIFY(!top->findDeclarations(QualifiedIdentifier("foo")).isEmpty());
 }
 
 void TestDUChain::testReparseUnchanged_data()
 {
     QTest::addColumn<QString>("headerCode");
     QTest::addColumn<QString>("implCode");
 
     QTest::newRow("include-guards") << R"(
         #ifndef GUARD
         #define GUARD
         int something;
         #endif
     )" << R"(
         #include "%1"
     )";
 
     QTest::newRow("template-default-parameters") << R"(
         #ifndef TEST_H
         #define TEST_H
 
         template<unsigned T=123, unsigned... U>
         class dummy;
 
         template<unsigned T, unsigned... U>
         class dummy {
             int field[T];
         };
 
         #endif
     )" << R"(
         #include "%1"
 
         int main(int, char **) {
             dummy<> x;
             (void)x;
         }
     )";
 }
 
 void TestDUChain::testReparseUnchanged()
 {
     QFETCH(QString, headerCode);
     QFETCH(QString, implCode);
     TestFile header(headerCode, QStringLiteral("h"));
     TestFile impl(implCode.arg(header.url().str()), QStringLiteral("cpp"), &header);
 
     auto checkProblems = [&] (bool reparsed) {
         DUChainReadLocker lock;
         auto headerCtx = DUChain::self()->chainForDocument(header.url());
         QVERIFY(headerCtx);
         QVERIFY(headerCtx->problems().isEmpty());
         auto implCtx = DUChain::self()->chainForDocument(impl.url());
         QVERIFY(implCtx);
         if (reparsed && CINDEX_VERSION_MINOR > 29 && CINDEX_VERSION_MINOR < 33) {
             QEXPECT_FAIL("template-default-parameters", "the precompiled preamble messes the default template parameters up in clang 3.7", Continue);
         }
         QVERIFY(implCtx->problems().isEmpty());
     };
 
     impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::AST  ));
     checkProblems(false);
 
     impl.parseAndWait(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses | TopDUContext::ForceUpdateRecursive));
     checkProblems(true);
 }
 
 void TestDUChain::testTypeAliasTemplate()
 {
     TestFile file(QStringLiteral("template <typename T> using Alias = T; using Foo = Alias<int>;"), QStringLiteral("cpp"));
     QVERIFY(file.parseAndWait());
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
 
     QCOMPARE(file.topContext()->localDeclarations().size(), 2);
     auto templateAlias = file.topContext()->localDeclarations().first();
     QVERIFY(templateAlias);
 #if CINDEX_VERSION_MINOR < 31
     QEXPECT_FAIL("", "TypeAliasTemplate is not exposed via LibClang", Abort);
 #endif
     QVERIFY(templateAlias->isTypeAlias());
     QVERIFY(templateAlias->abstractType());
     QCOMPARE(templateAlias->abstractType()->toString(), QStringLiteral("Alias"));
     QCOMPARE(templateAlias->uses().size(), 1);
     QCOMPARE(templateAlias->uses().first().size(), 1);
     QCOMPARE(templateAlias->uses().first().first(), RangeInRevision(0, 51, 0, 56));
 }
 
 void TestDUChain::testDeclarationsInsideMacroExpansion()
 {
     TestFile header(QStringLiteral("#define DECLARE(a) typedef struct a##__ {int var;} *a\nDECLARE(D);\n"), QStringLiteral("h"));
     TestFile file("#include \"" + header.url().str() + "\"\nint main(){\nD d; d->var;}\n", QStringLiteral("cpp"));
 
     file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST));
     QVERIFY(file.waitForParsed(5000));
 
     {
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
     }
 
     file.parse(TopDUContext::Features(TopDUContext::AllDeclarationsContextsAndUses|TopDUContext::AST|TopDUContext::ForceUpdate));
     QVERIFY(file.waitForParsed(5000));
 
     DUChainReadLocker lock;
     QVERIFY(file.topContext());
     QCOMPARE(file.topContext()->localDeclarations().size(), 1);
 
     auto context = file.topContext()->childContexts().first()->childContexts().first();
     QVERIFY(context);
     QCOMPARE(context->localDeclarations().size(), 1);
     QCOMPARE(context->usesCount(), 3);
 
     QCOMPARE(context->uses()[0].m_range, RangeInRevision({2, 0}, {2, 1}));
     QCOMPARE(context->uses()[1].m_range, RangeInRevision({2, 5}, {2, 6}));
     QCOMPARE(context->uses()[2].m_range, RangeInRevision({2, 8}, {2, 11}));
 }
 
 // see also: https://bugs.kde.org/show_bug.cgi?id=368067
 void TestDUChain::testForwardTemplateTypeParameterContext()
 {
     TestFile file(QStringLiteral(R"(
         template<typename MatchingName> class Foo;
 
         class MatchingName { void bar(); };
         void MatchingName::bar() {  }
     )"), QStringLiteral("cpp"));
 
     file.parse();
     QVERIFY(file.waitForParsed(500));
     DUChainReadLocker lock;
     const auto top = file.topContext();
     QVERIFY(top);
     DUChainDumper dumper(DUChainDumper::Features(DUChainDumper::DumpContext | DUChainDumper::DumpProblems));
     dumper.dump(top);
 
     auto declarations = top->localDeclarations();
     QCOMPARE(declarations.size(), 2);
 }
 
 // see also: https://bugs.kde.org/show_bug.cgi?id=368460
 void TestDUChain::testTemplateFunctionParameterName()
 {
     TestFile file(QStringLiteral(R"(
         template<class T>
         void foo(int name);
 
         void bar(int name);
     )"), QStringLiteral("cpp"));
 
     file.parse();
     QVERIFY(file.waitForParsed(500));
     DUChainReadLocker lock;
     const auto top = file.topContext();
     QVERIFY(top);
     DUChainDumper dumper(DUChainDumper::Features(DUChainDumper::DumpContext | DUChainDumper::DumpProblems));
     dumper.dump(top);
 
     auto declarations = top->localDeclarations();
     QCOMPARE(declarations.size(), 2);
 
     for (auto decl : declarations) {
         auto ctx = DUChainUtils::getArgumentContext(decl);
         QVERIFY(ctx);
         auto args = ctx->localDeclarations();
         if (decl == declarations.first())
             QEXPECT_FAIL("", "We get two declarations, for both template and args :(", Continue);
         QCOMPARE(args.size(), 1);
         if (decl == declarations.first())
             QEXPECT_FAIL("", "see above, this then triggers T T here", Continue);
         QCOMPARE(args.first()->toString(), QStringLiteral("int name"));
     }
 }
 
 static bool containsErrors(const QList<Problem::Ptr>& problems)
 {
     auto it = std::find_if(problems.begin(), problems.end(), [] (const Problem::Ptr& problem) {
         return problem->severity() == Problem::Error;
     });
     return it != problems.end();
 }
 
 static bool expectedXmmintrinErrors(const QList<Problem::Ptr>& problems)
 {
     foreach (const auto& problem, problems) {
         if (problem->severity() == Problem::Error && !problem->description().contains(QLatin1String("Cannot initialize a parameter of type"))) {
             return false;
         }
     }
     return true;
 }
 
 static void verifyNoErrors(TopDUContext* top, QSet<TopDUContext*>& checked)
 {
     const auto problems = top->problems();
     if (containsErrors(problems)) {
         qDebug() << top->url() << top->problems();
         if (top->url().str().endsWith(QLatin1String("xmmintrin.h")) && expectedXmmintrinErrors(problems)) {
             QEXPECT_FAIL("", "there are still some errors in xmmintrin.h b/c some clang provided intrinsincs are more strict than the GCC ones.", Continue);
             QVERIFY(false);
         } else {
             QFAIL("parse error detected");
         }
     }
     const auto imports = top->importedParentContexts();
     foreach (const auto& import, imports) {
         auto ctx = import.context(top);
         QVERIFY(ctx);
         auto importedTop = ctx->topContext();
         if (checked.contains(importedTop)) {
             continue;
         }
         checked.insert(importedTop);
         verifyNoErrors(importedTop, checked);
     }
 }
 
 void TestDUChain::testFriendDeclaration()
 {
     TestFile file(QStringLiteral(R"(
         struct FriendFoo
         {
             friend class FriendBar;
         };
 
         class FriendBar{};
 
         FriendBar friendBar;
     )"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     QVERIFY(file.waitForParsed(1000));
     {
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->localDeclarations().size(), 3);
 
         auto friendBar = file.topContext()->localDeclarations()[1];
         if (CINDEX_VERSION_MINOR < 37) {
             QEXPECT_FAIL("", "Your clang version is too old", Abort);
         }
         QCOMPARE(friendBar->uses().size(), 1);
         QCOMPARE(friendBar->uses().begin()->first(), RangeInRevision(3,25,3,34));
         QCOMPARE(friendBar->uses().begin()->last(), RangeInRevision(8,8,8,17));
     }
 }
 
 void TestDUChain::testVariadicTemplateArguments()
 {
     TestFile file(QStringLiteral(R"(
         template<typename T, typename... Targs>
         class VariadicTemplate {};
 
         VariadicTemplate<int, double, bool> variadic;
     )"), QStringLiteral("cpp"));
     file.parse(TopDUContext::AllDeclarationsContextsAndUses);
 
     QVERIFY(file.waitForParsed(1000));
     {
         DUChainReadLocker lock;
         QVERIFY(file.topContext());
         QCOMPARE(file.topContext()->localDeclarations().size(), 2);
 
         auto decl = file.topContext()->localDeclarations()[1];
         QVERIFY(decl);
         if (CINDEX_VERSION_MINOR < 37) {
             QEXPECT_FAIL("", "Your clang version is too old", Abort);
         }
         QCOMPARE(decl->toString(), QStringLiteral("VariadicTemplate< int, double, bool > variadic"));
 
         QVERIFY(decl->abstractType());
         QCOMPARE(decl->abstractType()->toString(), QStringLiteral("VariadicTemplate< int, double, bool >"));
     }
 }
 
 void TestDUChain::testGccCompatibility()
 {
     // TODO: make it easier to change the compiler provider for testing purposes
     QTemporaryDir dir;
     auto project = new TestProject(Path(dir.path()), this);
     auto definesAndIncludesConfig = project->projectConfiguration()->group("CustomDefinesAndIncludes");
     auto pathConfig = definesAndIncludesConfig.group("ProjectPath0");
     pathConfig.writeEntry("Path", ".");
     pathConfig.group("Compiler").writeEntry("Name", "GCC");
     m_projectController->addProject(project);
 
     {
         // TODO: Also test in C mode. Currently it doesn't work (some intrinsics missing?)
         TestFile file(QStringLiteral(R"(
             #include <x86intrin.h>
 
             int main() { return 0; }
         )"), QStringLiteral("cpp"), project, dir.path());
 
         file.parse();
         QVERIFY(file.waitForParsed(5000));
 
         DUChainReadLocker lock;
         QSet<TopDUContext*> checked;
         verifyNoErrors(file.topContext(), checked);
     }
 
     m_projectController->closeAllProjects();
 }
 
 void TestDUChain::testQtIntegration()
 {
     QTemporaryDir includeDir;
     {
         QDir dir(includeDir.path());
         dir.mkdir(QStringLiteral("QtCore"));
         // create the file but don't put anything in it
         QFile header(includeDir.path() + "/QtCore/qobjectdefs.h");
         QVERIFY(header.open(QIODevice::WriteOnly | QIODevice::Text));
     }
     QTemporaryDir dir;
     auto project = new TestProject(Path(dir.path()), this);
     m_provider->defines.clear();
     m_provider->includes = {Path(includeDir.path() + "/QtCore")};
 
     m_projectController->addProject(project);
 
     {
         TestFile file(QStringLiteral(R"(
             #define slots
             #define signals
             #define Q_SLOTS
             #define Q_SIGNALS
             #include <QtCore/qobjectdefs.h>
 
             struct MyObject {
             public:
               void other1();
             public slots:
               void slot1();
             signals:
               void signal1();
             private Q_SLOTS:
               void slot2();
             Q_SIGNALS:
               void signal2();
             public:
               void other2();
             };
         )"), QStringLiteral("cpp"), project, dir.path());
 
         file.parse();
         QVERIFY(file.waitForParsed(5000));
 
         DUChainReadLocker lock;
         auto top = file.topContext();
         QVERIFY(top);
         QVERIFY(top->problems().isEmpty());
         const auto methods = top->childContexts().last()->localDeclarations();
         QCOMPARE(methods.size(), 6);
         foreach(auto method, methods) {
             auto classFunction = dynamic_cast<ClassFunctionDeclaration*>(method);
             QVERIFY(classFunction);
             auto id = classFunction->identifier().toString();
             QCOMPARE(classFunction->isSignal(), id.startsWith(QLatin1String("signal")));
             QCOMPARE(classFunction->isSlot(), id.startsWith(QLatin1String("slot")));
         }
     }
 
     m_projectController->closeAllProjects();
 }
+
+void TestDUChain::testHasInclude()
+{
+    TestFile header(QStringLiteral(R"(
+        #pragma once
+        #if __has_include_next(<atomic>)
+        // good
+        #else
+        #error broken c++11 setup (__has_include_next)
+        #endif
+    )"), QStringLiteral("h"));
+    // NOTE: header is _not_ explicitly being parsed, instead the impl job does that
+
+    TestFile file(QStringLiteral(R"(
+        #if __has_include(<atomic>)
+        // good
+        #else
+        #error broken c++11 setup (__has_include)
+        #endif
+        #include "%1"
+    )").arg(header.url().str()), QStringLiteral("cpp"));
+    file.parse(TopDUContext::AllDeclarationsContextsAndUses);
+
+    QVERIFY(file.waitForParsed(1000));
+    {
+        DUChainDumper dumper({DUChainDumper::DumpProblems});
+
+        DUChainReadLocker lock;
+
+        QVERIFY(file.topContext());
+        dumper.dump(file.topContext());
+        QVERIFY(file.topContext()->problems().isEmpty());
+
+        auto headerCtx = DUChain::self()->chainForDocument(header.url());
+        QVERIFY(headerCtx);
+        dumper.dump(headerCtx);
+        QVERIFY(headerCtx->problems().count() <= 1);
+        for (const auto& problem : headerCtx->problems()) {
+            // ignore the following error:  "#include_next with absolute path [-Winclude-next-absolute-path]" "" [ (2, 12)  ->  (2, 30) ]
+            QVERIFY(problem->description().contains(QLatin1String("-Winclude-next-absolute-path")));
+        }
+    }
+}
diff --git a/plugins/clang/tests/test_duchain.h b/plugins/clang/tests/test_duchain.h
index c05dbbe0e5..805ed5f9fa 100644
--- a/plugins/clang/tests/test_duchain.h
+++ b/plugins/clang/tests/test_duchain.h
@@ -1,109 +1,110 @@
 /*
  * Copyright 2014  Milian Wolff <mail@milianw.de>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License or (at your option) version 3 or any later version
  * accepted by the membership of KDE e.V. (or its successor approved
  * by the membership of KDE e.V.), which shall act as a proxy
  * defined in Section 14 of version 3 of the license.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifndef DUCHAINTEST_H
 #define DUCHAINTEST_H
 
 #include <QObject>
 
 class TestEnvironmentProvider;
 
 namespace KDevelop {
 class TestProjectController;
 }
 
 class TestDUChain : public QObject
 {
     Q_OBJECT
 public:
     ~TestDUChain() override;
 
 private Q_SLOTS:
     void initTestCase();
     void cleanupTestCase();
 
     void init();
     void cleanup();
 
     void testComments();
     void testComments_data();
     void testElaboratedType();
     void testElaboratedType_data();
 
     void testInclude();
     void testMissingInclude();
     void testIncludeLocking();
     void testReparse();
     void testReparseError();
     void testTemplate();
     void testNamespace();
     void testAutoTypeDeduction();
     void testTypeDeductionInTemplateInstantiation();
     void testVirtualMemberFunction();
     void testBaseClasses();
     void testReparseBaseClasses();
     void testReparseBaseClassesTemplates();
     void testGetInheriters();
     void testGetInheriters_data();
     void testGlobalFunctionDeclaration();
     void testFunctionDefinitionVsDeclaration();
     void testEnsureNoDoubleVisit();
     void testReparseWithAllDeclarationsContextsAndUses();
     void testReparseOnDocumentActivated();
     void testParsingEnvironment();
     void testSystemIncludes();
     void testReparseInclude();
     void testReparseChangeEnvironment();
     void testMacrosRanges();
     void testMacroUses();
     void testHeaderParsingOrder1();
     void testHeaderParsingOrder2();
     void testMacroDependentHeader();
     void testNestedImports();
     void testEnvironmentWithDifferentOrderOfElements();
     void testReparseMacro();
     void testMultiLineMacroRanges();
     void testNestedMacroRanges();
     void testGotoStatement();
     void testRangesOfOperatorsInsideMacro();
     void testActiveDocumentHasASTAttached();
     void testActiveDocumentsGetBestPriority();
     void testUsesCreatedForDeclarations();
     void testReparseIncludeGuard();
     void testExternC();
     void testReparseUnchanged_data();
     void testReparseUnchanged();
     void testTypeAliasTemplate();
     void testDeclarationsInsideMacroExpansion();
     void testForwardTemplateTypeParameterContext();
     void testTemplateFunctionParameterName();
     void testFriendDeclaration();
     void testVariadicTemplateArguments();
 
     void benchDUChainBuilder();
     void testGccCompatibility();
     void testQtIntegration();
+    void testHasInclude();
 
 private:
     QScopedPointer<TestEnvironmentProvider> m_provider;
     KDevelop::TestProjectController* m_projectController;
 };
 
 #endif // DUCHAINTEST_H