#2584: Pretty printing of types with HsDocTy goes wrong
---------------------------------+------------------------------------------
Reporter: NeilMitchell | Owner: waern
Type: bug | Status: assigned
Priority: high | Milestone: 6.10.2
Component: Compiler | Version: 6.9
Severity: major | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by NeilMitchell):
I have now worked around this bug in Hoogle, in quite a clean way, so this
no longer effects development builds of Hoogle. If I had been able to use
SYB the workaround would have been 15x shorter and much more robust...
I did track the bug down somewhat in GHC - see compiler\hsSyn\HsTypes.lhs,
line 379:
{{{
ppr_mono_ty _ (HsDocTy ty doc)
= ppr ty <+> ppr (unLoc doc)
}}}
All the other ppr_mono_ty functions have a maybeParen call first, which is
missing here. You'll need to figure out the relative priorities etc. Or
perhaps just remove HsDocTy's when pretty printing?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2584#comment:8>
GHC <http://www.haskell.org/ghc/>
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