#4918: Rule matcher failing to look through an imported inlining
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Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Pedro reported
{{{
module M1 where
class MyEnum a where myEnum :: [a]
instance MyEnum () where myEnum = [()]
module M2 where
import M1
f1 = map (\() -> 'p') [()]
f2 = map (\() -> 'q') myEnum
}}}
The code for `f1` was optimised (by rewrite rules) to
{{{
f1 = ['p']
}}}
but the code for `f2` wasn't.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4918>
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The Glasgow Haskell Compiler
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