ghc panic during parsing
For the following piece of code
class Bla (forall x . x) wherethe ghc parser yields the appropriate error
Forall type not allowed as type parameterHowever, if you change the code to this
class Bla (forall x . x :: *) whereThen 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 collectThis 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 | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
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