#5516: Universally quantified GADT context leads to overlapping instance
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Reporter: andersk | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHC rejects valid program
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Comment(by andersk):
Even if GHC is unable to use the polymorphic evidence, I feel like its
presence should not cause an error when the code would otherwise have
worked. If that’s true, this is a regression from 7.0. But probably
nobody writes code like this, so I guess the question is whether there’s
now a good reason to disallow it.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5516#comment:3>
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