Pattern Synonyms using other synonyms causes ghc panic
Here's a (somewhat) minimal example:
{-# LANGUAGE PatternSynonyms #-}
data Some = Thing Int Int
pattern A x = Thing x 0
pattern B x = Thing x 1
pattern C x = Thing x 2
pattern D = C 3
And here's what happened when I tried to load this into ghci:
*Main> :l ghc_bug.hs
[1 of 1] Compiling Main ( ghc_bug.hs, interpreted )
ghc: panic! (the 'impossible' happened)
(GHC version 8.0.1 for x86_64-unknown-linux):
kindPrimRep.go rep_a3fP
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
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Blocking | |
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