RebindableSyntax with pattern guards needs `fail`
If I say
{-# LANGUAGE RebindableSyntax #-}
module Bug where
foo :: (a, b) -> ()
foo x | (_,_) <- x = ()
I get
Bug.hs:6:9: error: Not in scope: ‘fail’
Yet even if I bring fail
into scope, it's not mentioned in the Core produced by my program. And it really shouldn't: there's not a monad in sight!
Trac metadata
Trac field | Value |
---|---|
Version | 7.11 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |