matchGroupArity panic with PatternSynonyms
{-# LANGUAGE PatternSynonyms, ViewPatterns, EmptyCase #-}
pattern Id <- (id -> _) where
which gives:
% ghc -ignore-dot-ghci tmp.FbbzjZ48OO.hs
[1 of 1] Compiling Main ( tmp.FbbzjZ48OO.hs, tmp.FbbzjZ48OO.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.10.0.20150316 for i386-unknown-linux):
matchGroupArity
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Linux |
Architecture | x86 |