#2822: Arity expansion not working right
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Reporter: simonpj | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone: 6.10 branch
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by batterseapower):
This is happening because at the time we compile GHC.Handle, the Prelude
module has not yet been compiled. This means that Prelude.catch is
pesimistically assumed to have an arity of 0, so openFile can only have an
arity as large as the number of leading lambdas it has - i.e. 2.
I don't think there is a clean solution for this without whole-program
compilation.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2822#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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