GHC rejects code that Haskell 2010 report accepts
According to The Haskell 2010 Report, the following two modules should compile. But they don't, failing with parse errors:
{-# LANGUAGE Haskell2010 #-}
module Bug where
bool = - case b of False -> 0; True -> (-1)
{-# LANGUAGE Haskell2010 #-}
instance Num (IO a) where
negate = id
main = - do putStrLn "hi!"
Note the unary -
signs.
I'm not sure whether we should complicate the parser to fix these, but we should document the compliance-failure in the manual.
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |