#2440: Bad code with type families
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Reporter: rl | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone: 6.10 branch
Component: Compiler | Version: 6.9
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by simonpj):
Yes, I think that's exactly the problem. The eta-expander needs to be
smarter. But, as you pointed out when we met, in general that means
making use of the coercion terms in the expression; we can no longer say
"this term e of type ty has arity 3; please eta-expand it", because the
coercion terms needed to do so may be complicated.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2440#comment:5>
GHC <http://www.haskell.org/ghc/>
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