It be good if built-in Haskell operators (i.e.: the symbolic keywords on this page) were colored differently than surrounding text -- maybe dark grey or another shade.
You can tweak this locally. If you're using the default colour scheme you would change this style or see my comment/suggestion in the other bug report if you want to generally help us improve Haskell highlighting.
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You can tweak this locally. If you're using the default colour scheme you would change this style or see my comment/suggestion in the other bug report if you want to generally help us improve Haskell highlighting.