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20<span style="color:#898887;">-- one-line comment.</span> 20​<span style="color:#898887;">-- one-line comment.</span>
21 21​
22<span style="color:#898887;">-}</span> 22​<span style="color:#898887;">-}</span>
23 23​
24<span style="font-weight:bold;">import</span> <span style="color:#0057ae;">Prelude</span> <span style="color:#898887;">--</span> 24​<span style="font-weight:bold;">import</span> <span style="color:#0057ae;">Prelude</span> <span style="color:#898887;">--</span>
25 25​
26<span style="color:#898887;">-- a data definition</span> 26​<span style="color:#898887;">-- a data definition</span>
27 27​
28<span style="font-weight:bold;">data</span> <span style="color:#0057ae;">Tree</span> a = <span style="color:#0057ae;">Br</span> (<span style="color:#0057ae;">Tree</span> a) (<span style="color:#0057ae;">Tree</span> a) | <span style="color:#0057ae;">Leaf</span> a | <span style="color:#0057ae;">Nil</span> <span style="font-weight:bold;">deriving</span> (<span style="color:#0057ae;">Show</span>, <span style="color:#0057ae;">Eq</span>) 28​<span style="font-weight:bold;">data</span> <span style="color:#0057ae;">Tree</span> a <span style="color:#006e28;">=</span> <span style="color:#0057ae;">Br</span> (<span style="color:#0057ae;">Tree</span> a) (<span style="color:#0057ae;">Tree</span> a) | <span style="color:#0057ae;">Leaf</span> a | <span style="color:#0057ae;">Nil</span> <span style="font-weight:bold;">deriving</span> (<span style="color:#0057ae;">Show</span>, <span style="color:#0057ae;">Eq</span>)
29 29​
30 30​
31<span style="color:#898887;">-- function definition, &quot;funnyfunction::&quot;, </span><span style="color:#898887;text-decoration:underline;">&quot;Integer&quot;</span><span style="color:#898887;">, </span><span style="color:#898887;text-decoration:underline;">&quot;Int&quot;</span><span style="color:#898887;">, </span><span style="color:#898887;text-decoration:underline;">&quot;Bool&quot;</span><span style="color:#898887;"> should be highlighted</span> 31​<span style="color:#898887;">-- function definition, &quot;funnyfunction::&quot;, </span><span style="color:#898887;text-decoration:underline;">&quot;Integer&quot;</span><span style="color:#898887;">, </span><span style="color:#898887;text-decoration:underline;">&quot;Int&quot;</span><span style="color:#898887;">, </span><span style="color:#898887;text-decoration:underline;">&quot;Bool&quot;</span><span style="color:#898887;"> should be highlighted</span>
32 32​
33<span style="color:#006e28;">funnyfunction</span><span style="color:#006e28;">::</span>(<span style="color:#0057ae;">Tree</span> a)<span style="color:#006e28;">=&gt;</span>[a]<span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Integer</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Int</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Bool</span> 33​<span style="color:#006e28;">funnyfunction</span><span style="color:#006e28;">::</span>(<span style="color:#0057ae;">Tree</span> a)<span style="color:#006e28;">=&gt;</span>[a]<span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Integer</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Int</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Bool</span>
34 34​
35 35​
36<span style="color:#898887;">-- strings and chars</span> 36​<span style="color:#898887;">-- strings and chars</span>
37<span style="color:#898887;">-- first line of function definitions (type declaration) should be highlighted</span> 37​<span style="color:#898887;">-- first line of function definitions (type declaration) should be highlighted</span>
38 38​
39<span style="color:#006e28;">strangefunction</span><span style="color:#006e28;">::</span><span style="color:#0057ae;">Int</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">String</span> 39​<span style="color:#006e28;">strangefunction</span><span style="color:#006e28;">::</span><span style="color:#0057ae;">Int</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">String</span>
40strangefunction <span style="color:#b08000;">1</span> = <span style="color:#bf0303;">&quot;hello&quot;</span> 40​strangefunction <span style="color:#b08000;">1</span> <span style="color:#006e28;">=</span> <span style="color:#bf0303;">&quot;hello&quot;</span>
41strangefunction <span style="color:#b08000;">2</span> = <span style="color:#bf0303;">&quot;what's up&quot;</span> 41​strangefunction <span style="color:#b08000;">2</span> <span style="color:#006e28;">=</span> <span style="color:#bf0303;">&quot;what's up&quot;</span>
42strangefunction <span style="color:#b08000;">3</span> = (strangefunction <span style="color:#b08000;">1</span>) ++ <span style="color:#bf0303;">&quot;, &quot;</span> ++ (strangefunction <span style="color:#b08000;">2</span>) 42​strangefunction <span style="color:#b08000;">3</span> <span style="color:#006e28;">=</span> (strangefunction <span style="color:#b08000;">1</span>) ++ <span style="color:#bf0303;">&quot;, &quot;</span> ++ (strangefunction <span style="color:#b08000;">2</span>)
43strangefunction <span style="color:#b08000;">4</span> = <span style="color:#924c9d;">'a'</span>:<span style="color:#924c9d;">'b'</span>:<span style="color:#924c9d;">'c'</span>:<span style="color:#924c9d;">'&quot;'</span>:[] <span style="color:#898887;">-- will return &quot;abc&quot;</span> 43​strangefunction <span style="color:#b08000;">4</span> <span style="color:#006e28;">=</span> <span style="color:#924c9d;">'a'</span>:<span style="color:#924c9d;">'b'</span>:<span style="color:#924c9d;">'c'</span>:<span style="color:#924c9d;">'&quot;'</span>:[] <span style="color:#898887;">-- will return &quot;abc&quot;</span>
44strangefunction <span style="color:#b08000;">5</span> = <span style="color:#924c9d;">'\n'</span>:[] 44​strangefunction <span style="color:#b08000;">5</span> <span style="color:#006e28;">=</span> <span style="color:#924c9d;">'\n'</span>:[]
45strangefunction <span style="color:#b08000;">6</span> = <span style="color:#924c9d;">'\invalidhaskell'</span>:[] 45​strangefunction <span style="color:#b08000;">6</span> <span style="color:#006e28;">=</span> <span style="color:#924c9d;">'\invalidhaskell'</span>:[]
46 46​
47<span style="color:#898887;">-- function name including the single quote character</span> 47​<span style="color:#898887;">-- function name including the single quote character</span>
48<span style="color:#898887;">-- and infix operator (`div`)</span> 48​<span style="color:#898887;">-- and infix operator (`div`)</span>
49 49​
50<span style="color:#006e28;">justtesting'</span><span style="color:#006e28;">::</span><span style="color:#0057ae;">Int</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Int</span> 50​<span style="color:#006e28;">justtesting'</span><span style="color:#006e28;">::</span><span style="color:#0057ae;">Int</span><span style="color:#006e28;">-&gt;</span><span style="color:#0057ae;">Int</span>
51justtesting' <span style="color:#b08000;">2</span> = <span style="color:#b08000;">2</span>+<span style="color:#b08000;">1</span> 51​justtesting' <span style="color:#b08000;">2</span> <span style="color:#006e28;">=</span> <span style="color:#b08000;">2</span>+<span style="color:#b08000;">1</span>
52justtesting' <span style="color:#b08000;">9</span> = <span style="color:#b08000;">7</span> <span style="color:#006e28;">`div`</span> <span style="color:#b08000;">2</span> 52​justtesting' <span style="color:#b08000;">9</span> <span style="color:#006e28;">=</span> <span style="color:#b08000;">7</span> <span style="color:#006e28;">`div`</span> <span style="color:#b08000;">2</span>
53 53​
54<span style="color:#898887;">-- same definition as above, slightly different function name and a couple more whitespaces</span> 54​<span style="color:#898887;">-- same definition as above, slightly different function name and a couple more whitespaces</span>
55 55​
56<span style="color:#006e28;">justtesting'' </span><span style="color:#006e28;">::</span> <span style="color:#0057ae;">Int</span> <span style="color:#006e28;">-&gt;</span> <span style="color:#0057ae;">Int</span> 56​<span style="color:#006e28;">justtesting'' </span><span style="color:#006e28;">::</span> <span style="color:#0057ae;">Int</span> <span style="color:#006e28;">-&gt;</span> <span style="color:#0057ae;">Int</span>
57justtesting'' <span style="color:#b08000;">2</span> = <span style="color:#b08000;">3</span> 57​justtesting'' <span style="color:#b08000;">2</span> <span style="color:#006e28;">=</span> <span style="color:#b08000;">3</span>
58justtesting'' <span style="color:#b08000;">9</span> = <span style="color:#b08000;">3</span> + <span style="color:#b08000;">9</span> - <span style="color:#b08000;">9</span> 58​justtesting'' <span style="color:#b08000;">9</span> <span style="color:#006e28;">=</span> <span style="color:#b08000;">3</span> + <span style="color:#b08000;">9</span> - <span style="color:#b08000;">9</span>
59 59​
60<span style="color:#898887;">-- the following lines are copied out of Haskell's &quot;Prelude.hs&quot;</span> 60​<span style="color:#898887;">-- the following lines are copied out of Haskell's &quot;Prelude.hs&quot;</span>
61 61​
62<span style="font-weight:bold;">infixl</span> <span style="color:#b08000;">7</span> *, /, <span style="color:#006e28;">`quot`</span>, <span style="color:#006e28;">`rem`</span>, <span style="color:#006e28;">`div`</span>, <span style="color:#006e28;">`mod`</span>, :%, % 62​<span style="font-weight:bold;">infixl</span> <span style="color:#b08000;">7</span> *, /, <span style="color:#006e28;">`quot`</span>, <span style="color:#006e28;">`rem`</span>, <span style="color:#006e28;">`div`</span>, <span style="color:#006e28;">`mod`</span>, :%, %
63 63​
64 64​
65<span style="color:#898887;">-- everything highlighted except the &quot;a&quot;</span> 65​<span style="color:#898887;">-- everything highlighted except the &quot;a&quot;</span>
66 66​
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