#5775: Inconsistency in demand analysis
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Reporter: rl | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.4.2
Component: Compiler | Version: 7.5
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Runtime performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonmar):
If the fragility of the hack is only exposed by `unsafePerformIO`, then
I'm in favour of keeping the hack. I think it's important that evaluation
not commute with side effects in IO, otherwise I'm afraid we'll start
seeing lots of strange effects (Simon's example of exceptions floating
outside of `catch` is a great example, and I'm sure there will be lots
more).
I think the Eval monad might be relying on this hack too, but I'll have to
check.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5775#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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