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 |