#7436: Derived Foldable and Traversable instances become extremely inefficient
due
to eta-expansion
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Reporter: shachaf | Owner:
Type: bug | Status: patch
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Runtime performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Changes (by twanvl):
* status: new => patch
Comment:
I have done what I described in my previous comment, and attached a patch.
I have also added foldMap to the generated Foldable instance, which I
agree is a more natural function.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7436#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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