#2357: Implement the Haskell' proposal for polymorphic pattern bindings
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Reporter: simonmar
| Owner:
Type: task
| Status: closed
Priority: high
| Milestone: 7.4.1
Component: Compiler (Type checker)
| Version: 6.8.2
Resolution: fixed
| Keywords:
Testcase: typecheck/should_compile/T1897a,
indexed_types/should_compile/T1897b | Blockedby:
Difficulty: Unknown
| Os: Unknown/Multiple
Blocking:
| Architecture: Unknown/Multiple
Failure: None/Unknown
|
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Comment(by MartijnVanSteenbergen):
Thank you, that's great news!
Just yesterday I wrote three programs which used -XNoMonoPatBinds and
respectively caused the type-checker to hang, to panic and compiled fine
but (seemed to) have wrong behaviour, using GHC 7.0.3.
I've made the panic program as small as I could:
{{{
{-# LANGUAGE NoMonoPatBinds #-}
f :: Show a => a
(f, _) = undefined
g :: Show a => a
g = f
}}}
Perhaps you can use it as a test case for the new algorithm.
If I manage to make the other programs smaller too, I'll post them here.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2357#comment:15>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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