diff --git a/autotests/folding/highlight.hs.fold b/autotests/folding/highlight.hs.fold
--- a/autotests/folding/highlight.hs.fold
+++ b/autotests/folding/highlight.hs.fold
@@ -80,7 +80,7 @@
 
 -- functions
 
-FilePath, IOError, abs, acos, acosh, all, and, any, appendFile,
+abs, acos, acosh, all, and, any, appendFile,
 approxRational, asTypeOf, asin, asinh, atan, atan2, atanh, basicIORun,
 break, catch, ceiling, chr, compare, concat, concatMap, const, cos, cosh,
 curry, cycle, decodeFloat, denominator, digitToInt, div, divMod, drop,
@@ -112,8 +112,8 @@
 
 -- type constructors
 
-Bool, Char, Double, Either, Float, IO, Integer, Int, Maybe, Ordering, Rational, Ratio, ReadS,
-ShowS, String
+Bool, Char, Double, Either, FilePath, Float, IO, IOError, Integer, Int, Maybe,
+Ordering, Rational, Ratio, ReadS, ShowS, String
 
 -- classes
 
diff --git a/autotests/html/highlight.hs.html b/autotests/html/highlight.hs.html
--- a/autotests/html/highlight.hs.html
+++ b/autotests/html/highlight.hs.html
@@ -86,7 +86,7 @@
 
 <span style="color:#898887;">-- functions</span>
 
-<span style="color:#644a9b;">FilePath</span>, <span style="color:#644a9b;">IOError</span>, <span style="color:#644a9b;">abs</span>, <span style="color:#644a9b;">acos</span>, <span style="color:#644a9b;">acosh</span>, <span style="color:#644a9b;">all</span>, <span style="color:#644a9b;">and</span>, <span style="color:#644a9b;">any</span>, <span style="color:#644a9b;">appendFile</span>,
+<span style="color:#644a9b;">abs</span>, <span style="color:#644a9b;">acos</span>, <span style="color:#644a9b;">acosh</span>, <span style="color:#644a9b;">all</span>, <span style="color:#644a9b;">and</span>, <span style="color:#644a9b;">any</span>, <span style="color:#644a9b;">appendFile</span>,
 <span style="color:#644a9b;">approxRational</span>, <span style="color:#644a9b;">asTypeOf</span>, <span style="color:#644a9b;">asin</span>, <span style="color:#644a9b;">asinh</span>, <span style="color:#644a9b;">atan</span>, <span style="color:#644a9b;">atan2</span>, <span style="color:#644a9b;">atanh</span>, <span style="color:#644a9b;">basicIORun</span>,
 <span style="color:#644a9b;">break</span>, <span style="color:#644a9b;">catch</span>, <span style="color:#644a9b;">ceiling</span>, <span style="color:#644a9b;">chr</span>, <span style="color:#644a9b;">compare</span>, <span style="color:#644a9b;">concat</span>, <span style="color:#644a9b;">concatMap</span>, <span style="color:#644a9b;">const</span>, <span style="color:#644a9b;">cos</span>, <span style="color:#644a9b;">cosh</span>,
 <span style="color:#644a9b;">curry</span>, <span style="color:#644a9b;">cycle</span>, <span style="color:#644a9b;">decodeFloat</span>, <span style="color:#644a9b;">denominator</span>, <span style="color:#644a9b;">digitToInt</span>, <span style="color:#644a9b;">div</span>, <span style="color:#644a9b;">divMod</span>, <span style="color:#644a9b;">drop</span>,
@@ -118,8 +118,8 @@
 
 <span style="color:#898887;">-- type constructors</span>
 
-<span style="color:#0057ae;">Bool</span>, <span style="color:#0057ae;">Char</span>, <span style="color:#0057ae;">Double</span>, <span style="color:#0057ae;">Either</span>, <span style="color:#0057ae;">Float</span>, <span style="color:#0057ae;">IO</span>, <span style="color:#0057ae;">Integer</span>, <span style="color:#0057ae;">Int</span>, <span style="color:#0057ae;">Maybe</span>, <span style="color:#0057ae;">Ordering</span>, <span style="color:#0057ae;">Rational</span>, <span style="color:#0057ae;">Ratio</span>, <span style="color:#0057ae;">ReadS</span>,
-<span style="color:#0057ae;">ShowS</span>, <span style="color:#0057ae;">String</span>
+<span style="color:#0057ae;">Bool</span>, <span style="color:#0057ae;">Char</span>, <span style="color:#0057ae;">Double</span>, <span style="color:#0057ae;">Either</span>, <span style="color:#0057ae;">FilePath</span>, <span style="color:#0057ae;">Float</span>, <span style="color:#0057ae;">IO</span>, <span style="color:#0057ae;">IOError</span>, <span style="color:#0057ae;">Integer</span>, <span style="color:#0057ae;">Int</span>, <span style="color:#0057ae;">Maybe</span>,
+<span style="color:#0057ae;">Ordering</span>, <span style="color:#0057ae;">Rational</span>, <span style="color:#0057ae;">Ratio</span>, <span style="color:#0057ae;">ReadS</span>, <span style="color:#0057ae;">ShowS</span>, <span style="color:#0057ae;">String</span>
 
 <span style="color:#898887;">-- classes</span>
 
diff --git a/autotests/html/highlight.lhs.html b/autotests/html/highlight.lhs.html
--- a/autotests/html/highlight.lhs.html
+++ b/autotests/html/highlight.lhs.html
@@ -85,7 +85,7 @@
 
 functions
 
-<span style="color:#006e28;">&gt;</span> <span style="color:#644a9b;">FilePath</span>, <span style="color:#644a9b;">IOError</span>, <span style="color:#644a9b;">abs</span>, <span style="color:#644a9b;">acos</span>, <span style="color:#644a9b;">acosh</span>, <span style="color:#644a9b;">all</span>, <span style="color:#644a9b;">and</span>, <span style="color:#644a9b;">any</span>, <span style="color:#644a9b;">appendFile</span>,
+<span style="color:#006e28;">&gt;</span> <span style="color:#0057ae;">FilePath</span>, <span style="color:#0057ae;">IOError</span>, <span style="color:#644a9b;">abs</span>, <span style="color:#644a9b;">acos</span>, <span style="color:#644a9b;">acosh</span>, <span style="color:#644a9b;">all</span>, <span style="color:#644a9b;">and</span>, <span style="color:#644a9b;">any</span>, <span style="color:#644a9b;">appendFile</span>,
 <span style="color:#006e28;">&gt;</span> <span style="color:#644a9b;">approxRational</span>, <span style="color:#644a9b;">asTypeOf</span>, <span style="color:#644a9b;">asin</span>, <span style="color:#644a9b;">asinh</span>, <span style="color:#644a9b;">atan</span>, <span style="color:#644a9b;">atan2</span>, <span style="color:#644a9b;">atanh</span>, <span style="color:#644a9b;">basicIORun</span>,
 <span style="color:#006e28;">&gt;</span> <span style="color:#644a9b;">break</span>, <span style="color:#644a9b;">catch</span>, <span style="color:#644a9b;">ceiling</span>, <span style="color:#644a9b;">chr</span>, <span style="color:#644a9b;">compare</span>, <span style="color:#644a9b;">concat</span>, <span style="color:#644a9b;">concatMap</span>, <span style="color:#644a9b;">const</span>, <span style="color:#644a9b;">cos</span>, <span style="color:#644a9b;">cosh</span>,
 <span style="color:#006e28;">&gt;</span> <span style="color:#644a9b;">curry</span>, <span style="color:#644a9b;">cycle</span>, <span style="color:#644a9b;">decodeFloat</span>, <span style="color:#644a9b;">denominator</span>, <span style="color:#644a9b;">digitToInt</span>, <span style="color:#644a9b;">div</span>, <span style="color:#644a9b;">divMod</span>, <span style="color:#644a9b;">drop</span>,
diff --git a/autotests/input/highlight.hs b/autotests/input/highlight.hs
--- a/autotests/input/highlight.hs
+++ b/autotests/input/highlight.hs
@@ -80,7 +80,7 @@
 
 -- functions
 
-FilePath, IOError, abs, acos, acosh, all, and, any, appendFile,
+abs, acos, acosh, all, and, any, appendFile,
 approxRational, asTypeOf, asin, asinh, atan, atan2, atanh, basicIORun,
 break, catch, ceiling, chr, compare, concat, concatMap, const, cos, cosh,
 curry, cycle, decodeFloat, denominator, digitToInt, div, divMod, drop,
@@ -112,8 +112,8 @@
 
 -- type constructors
 
-Bool, Char, Double, Either, Float, IO, Integer, Int, Maybe, Ordering, Rational, Ratio, ReadS,
-ShowS, String
+Bool, Char, Double, Either, FilePath, Float, IO, IOError, Integer, Int, Maybe,
+Ordering, Rational, Ratio, ReadS, ShowS, String
 
 -- classes
 
diff --git a/autotests/reference/highlight.hs.ref b/autotests/reference/highlight.hs.ref
--- a/autotests/reference/highlight.hs.ref
+++ b/autotests/reference/highlight.hs.ref
@@ -80,7 +80,7 @@
 <dsNormal></dsNormal><br/>
 <Comment>-- functions</Comment><br/>
 <dsNormal></dsNormal><br/>
-<Function Prelude>FilePath</Function Prelude><Normal>, </Normal><Function Prelude>IOError</Function Prelude><Normal>, </Normal><Function Prelude>abs</Function Prelude><Normal>, </Normal><Function Prelude>acos</Function Prelude><Normal>, </Normal><Function Prelude>acosh</Function Prelude><Normal>, </Normal><Function Prelude>all</Function Prelude><Normal>, </Normal><Function Prelude>and</Function Prelude><Normal>, </Normal><Function Prelude>any</Function Prelude><Normal>, </Normal><Function Prelude>appendFile</Function Prelude><Normal>,</Normal><br/>
+<Function Prelude>abs</Function Prelude><Normal>, </Normal><Function Prelude>acos</Function Prelude><Normal>, </Normal><Function Prelude>acosh</Function Prelude><Normal>, </Normal><Function Prelude>all</Function Prelude><Normal>, </Normal><Function Prelude>and</Function Prelude><Normal>, </Normal><Function Prelude>any</Function Prelude><Normal>, </Normal><Function Prelude>appendFile</Function Prelude><Normal>,</Normal><br/>
 <Function Prelude>approxRational</Function Prelude><Normal>, </Normal><Function Prelude>asTypeOf</Function Prelude><Normal>, </Normal><Function Prelude>asin</Function Prelude><Normal>, </Normal><Function Prelude>asinh</Function Prelude><Normal>, </Normal><Function Prelude>atan</Function Prelude><Normal>, </Normal><Function Prelude>atan2</Function Prelude><Normal>, </Normal><Function Prelude>atanh</Function Prelude><Normal>, </Normal><Function Prelude>basicIORun</Function Prelude><Normal>,</Normal><br/>
 <Function Prelude>break</Function Prelude><Normal>, </Normal><Function Prelude>catch</Function Prelude><Normal>, </Normal><Function Prelude>ceiling</Function Prelude><Normal>, </Normal><Function Prelude>chr</Function Prelude><Normal>, </Normal><Function Prelude>compare</Function Prelude><Normal>, </Normal><Function Prelude>concat</Function Prelude><Normal>, </Normal><Function Prelude>concatMap</Function Prelude><Normal>, </Normal><Function Prelude>const</Function Prelude><Normal>, </Normal><Function Prelude>cos</Function Prelude><Normal>, </Normal><Function Prelude>cosh</Function Prelude><Normal>,</Normal><br/>
 <Function Prelude>curry</Function Prelude><Normal>, </Normal><Function Prelude>cycle</Function Prelude><Normal>, </Normal><Function Prelude>decodeFloat</Function Prelude><Normal>, </Normal><Function Prelude>denominator</Function Prelude><Normal>, </Normal><Function Prelude>digitToInt</Function Prelude><Normal>, </Normal><Function Prelude>div</Function Prelude><Normal>, </Normal><Function Prelude>divMod</Function Prelude><Normal>, </Normal><Function Prelude>drop</Function Prelude><Normal>,</Normal><br/>
@@ -112,8 +112,8 @@
 <dsNormal></dsNormal><br/>
 <Comment>-- type constructors</Comment><br/>
 <dsNormal></dsNormal><br/>
-<Type Prelude>Bool</Type Prelude><Normal>, </Normal><Type Prelude>Char</Type Prelude><Normal>, </Normal><Type Prelude>Double</Type Prelude><Normal>, </Normal><Type Prelude>Either</Type Prelude><Normal>, </Normal><Type Prelude>Float</Type Prelude><Normal>, </Normal><Type Prelude>IO</Type Prelude><Normal>, </Normal><Type Prelude>Integer</Type Prelude><Normal>, </Normal><Type Prelude>Int</Type Prelude><Normal>, </Normal><Type Prelude>Maybe</Type Prelude><Normal>, </Normal><Type Prelude>Ordering</Type Prelude><Normal>, </Normal><Type Prelude>Rational</Type Prelude><Normal>, </Normal><Type Prelude>Ratio</Type Prelude><Normal>, </Normal><Type Prelude>ReadS</Type Prelude><Normal>,</Normal><br/>
-<Type Prelude>ShowS</Type Prelude><Normal>, </Normal><Type Prelude>String</Type Prelude><br/>
+<Type Prelude>Bool</Type Prelude><Normal>, </Normal><Type Prelude>Char</Type Prelude><Normal>, </Normal><Type Prelude>Double</Type Prelude><Normal>, </Normal><Type Prelude>Either</Type Prelude><Normal>, </Normal><Type Prelude>FilePath</Type Prelude><Normal>, </Normal><Type Prelude>Float</Type Prelude><Normal>, </Normal><Type Prelude>IO</Type Prelude><Normal>, </Normal><Type Prelude>IOError</Type Prelude><Normal>, </Normal><Type Prelude>Integer</Type Prelude><Normal>, </Normal><Type Prelude>Int</Type Prelude><Normal>, </Normal><Type Prelude>Maybe</Type Prelude><Normal>,</Normal><br/>
+<Type Prelude>Ordering</Type Prelude><Normal>, </Normal><Type Prelude>Rational</Type Prelude><Normal>, </Normal><Type Prelude>Ratio</Type Prelude><Normal>, </Normal><Type Prelude>ReadS</Type Prelude><Normal>, </Normal><Type Prelude>ShowS</Type Prelude><Normal>, </Normal><Type Prelude>String</Type Prelude><br/>
 <dsNormal></dsNormal><br/>
 <Comment>-- classes</Comment><br/>
 <dsNormal></dsNormal><br/>
diff --git a/autotests/reference/highlight.lhs.ref b/autotests/reference/highlight.lhs.ref
--- a/autotests/reference/highlight.lhs.ref
+++ b/autotests/reference/highlight.lhs.ref
@@ -79,7 +79,7 @@
 <dsNormal></dsNormal><br/>
 <Text>functions</Text><br/>
 <dsNormal></dsNormal><br/>
-<BirdTrack>></BirdTrack><Text> </Text><Function Prelude>FilePath</Function Prelude><Text>, </Text><Function Prelude>IOError</Function Prelude><Text>, </Text><Function Prelude>abs</Function Prelude><Text>, </Text><Function Prelude>acos</Function Prelude><Text>, </Text><Function Prelude>acosh</Function Prelude><Text>, </Text><Function Prelude>all</Function Prelude><Text>, </Text><Function Prelude>and</Function Prelude><Text>, </Text><Function Prelude>any</Function Prelude><Text>, </Text><Function Prelude>appendFile</Function Prelude><Text>,</Text><br/>
+<BirdTrack>></BirdTrack><Text> </Text><Type Prelude>FilePath</Type Prelude><Text>, </Text><Type Prelude>IOError</Type Prelude><Text>, </Text><Function Prelude>abs</Function Prelude><Text>, </Text><Function Prelude>acos</Function Prelude><Text>, </Text><Function Prelude>acosh</Function Prelude><Text>, </Text><Function Prelude>all</Function Prelude><Text>, </Text><Function Prelude>and</Function Prelude><Text>, </Text><Function Prelude>any</Function Prelude><Text>, </Text><Function Prelude>appendFile</Function Prelude><Text>,</Text><br/>
 <BirdTrack>></BirdTrack><Text> </Text><Function Prelude>approxRational</Function Prelude><Text>, </Text><Function Prelude>asTypeOf</Function Prelude><Text>, </Text><Function Prelude>asin</Function Prelude><Text>, </Text><Function Prelude>asinh</Function Prelude><Text>, </Text><Function Prelude>atan</Function Prelude><Text>, </Text><Function Prelude>atan2</Function Prelude><Text>, </Text><Function Prelude>atanh</Function Prelude><Text>, </Text><Function Prelude>basicIORun</Function Prelude><Text>,</Text><br/>
 <BirdTrack>></BirdTrack><Text> </Text><Function Prelude>break</Function Prelude><Text>, </Text><Function Prelude>catch</Function Prelude><Text>, </Text><Function Prelude>ceiling</Function Prelude><Text>, </Text><Function Prelude>chr</Function Prelude><Text>, </Text><Function Prelude>compare</Function Prelude><Text>, </Text><Function Prelude>concat</Function Prelude><Text>, </Text><Function Prelude>concatMap</Function Prelude><Text>, </Text><Function Prelude>const</Function Prelude><Text>, </Text><Function Prelude>cos</Function Prelude><Text>, </Text><Function Prelude>cosh</Function Prelude><Text>,</Text><br/>
 <BirdTrack>></BirdTrack><Text> </Text><Function Prelude>curry</Function Prelude><Text>, </Text><Function Prelude>cycle</Function Prelude><Text>, </Text><Function Prelude>decodeFloat</Function Prelude><Text>, </Text><Function Prelude>denominator</Function Prelude><Text>, </Text><Function Prelude>digitToInt</Function Prelude><Text>, </Text><Function Prelude>div</Function Prelude><Text>, </Text><Function Prelude>divMod</Function Prelude><Text>, </Text><Function Prelude>drop</Function Prelude><Text>,</Text><br/>
diff --git a/data/syntax/haskell.xml b/data/syntax/haskell.xml
--- a/data/syntax/haskell.xml
+++ b/data/syntax/haskell.xml
@@ -27,8 +27,6 @@
     <item>where</item>
   </list>
   <list name="prelude function">
-    <item>FilePath</item>
-    <item>IOError</item>
     <item>abs</item>
     <item>acos</item>
     <item>acosh</item>