#2722: <<loop> when compiling with -O option with ghc-6.10.0.20081019
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Reporter: uwe | Owner:
Type: bug | Status: new
Priority: normal | Milestone: Not GHC
Component: libraries (other) | Version: 6.10.1
Severity: normal | Resolution:
Keywords: arrows | Difficulty: Unknown
Testcase: | Architecture: x86
Os: Linux |
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Comment (by uwe):
The guy who wrote the instance of IOSLA that was me. I took the advice
from Don Stewarts wiki page for porting arrow code to ghc-6.10.
As far as I see, in the definition of
{{{
id = arr id
}}}
the id on the right hand side is another one than id on the left.
The optimisation RULE above only holds for the instance Category (->), not
for
others. So the application of this rule should be restricted to (->).
By the way, would it be a workaround for me to define the id explicitly,
not using
the pure function id?
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2722#comment:7>
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