PatternSynonms and DisambiguateRecordFields causes panic
The following module causes a panic in HEAD:
{-# LANGUAGE PatternSynonyms, DisambiguateRecordFields #-}
data P a = MkP a
pattern S{x} = MkP x
e = S{x = 3}
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 7.11.20151223 for x86_64-unknown-linux):
find_tycon
S
[S pattern synonym defined at PatSynBug.hs:3:1]
This is essentially the same bug as #9975 (closed); for some reason it became slightly harder to tickle. Fix incoming.
Trac metadata
Trac field | Value |
---|---|
Version | 7.11 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
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Blocking | |
CC | |
Operating system | |
Architecture |