#5395: Context reduction stack overflow without undecidable instances
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.0.4
Keywords: type family, termination | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHC rejects valid
program
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Comment(by guest):
I'm fine with the increased threshold. The largest
context-stack--limit I used is 180.
It would be nice to include the phrase
The trouble is that some module you import may have used
`-XUndecidableInstances`, and that could cause your compilation to
diverge, even if you are ery well behaved.
in the documentation (in the section about `UndecidableInstances`).
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5395#comment:2>
GHC <http://www.haskell.org/ghc/>
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