#7235: "panic!" when compiling happstack-server-7.0.4
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Reporter: guest | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.2
Resolution: duplicate | Keywords:
Os: Linux | Architecture: Unknown/Multiple
Failure: GHC rejects valid program | Difficulty: Unknown
Testcase: | Blockedby:
Blocking: | Related:
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Comment(by simonpj):
Another possiblity is that `Happstack` is generating an empty
comprehension `CompExp[]`. In that case, what should happen? The pretty
printer probably shouldn't fall over. Maybe it should print `<<empty
CompE>>` in the pretty-printed output? I'll do that for now, and for the
other call to `error` in `TH.Ppr`.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7235#comment:2>
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