ghc panic during parsing
For the following piece of code
class Bla (forall x . x) where
the ghc parser yields the appropriate error
Forall type not allowed as type parameter
However, if you change the code to this
class Bla (forall x . x :: *) where
Then ghc does this:
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-apple-darwin):
parser/RdrHsSyn.lhs:(525,4)-(548,64): Non-exhaustive patterns in function collect
This is reproducible on ghc-6.8.3 and ghc-6.10.1.
I have only tried it on Mac OS X, x86.
Trac metadata
Trac field | Value |
---|---|
Version | 6.10.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Parser) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |