panic on negative literal in case on Word
module Case where
f :: Word -> Word
f n = case n of
-1 -> 2
_ -> 3
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 8.1.20170119 for x86_64-unknown-linux):
ASSERT failed!
-1
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1182:22 in ghc:Outputable
assertPprPanic, called at compiler/basicTypes/Literal.hs:223:75 in ghc:Literal
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in ghc:Outputable
pprPanic, called at compiler/utils/Outputable.hs:1180:5 in ghc:Outputable
assertPprPanic, called at compiler/basicTypes/Literal.hs:223:75 in ghc:Literal
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Doesn't happen in 8.0.1.
Trac metadata
Trac field | Value |
---|---|
Version | 8.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |