#2356: GHC accepts multiple instances for the same type in different modules
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Reporter: claus | Owner:
Type: bug | Status: new
Priority: low | Milestone: _|_
Component: Compiler | Version: 6.8.3
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown
Os: Unknown |
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Comment (by igloo):
Re:
{{{
With overlap allowed, it's clear that you can make different choices in
different parts of the program.
}}}
I don't agree. While I can see that you would want to commit to an
instance
early for optimisation reasons, I think you should then fail when
linking if it turns out that you would have made a different choice had
all of the program's instances been available.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2356#comment:9>
GHC <http://www.haskell.org/ghc/>
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