#5300: Infinite context reduction stack overflow
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Reporter: dsf | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.3
Resolution: fixed | Keywords:
Testcase: typecheck/should_fail/T5300 | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: Compile-time crash |
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Changes (by simonpj):
* status: new => closed
* testcase: => typecheck/should_fail/T5300
* resolution: => fixed
Comment:
The HEAD (upcoming 7.2) gives
{{{
T5300.hs:15:9:
Ambiguous type variable `c0' in the constraint:
(C1 a1 b2 c0) arising from a use of `f1'
Probable fix: add a type signature that fixes these type variable(s)
In the first argument of `(>>=)', namely `f1 fm'
In the expression: f1 fm >>= return . undefined
In an equation for `f2': f2 fm = f1 fm >>= return . undefined
}}}
which seems right. So I think this one is fixed. I'll add it as a
regression test though. Thanks.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5300#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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