[GHC] #14111: strange error when using data families with levity polymorphism and unboxed sums and data families
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Mon Aug 14 00:20:37 UTC 2017
#14111: strange error when using data families with levity polymorphism and unboxed
sums and data families
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Reporter: carter | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.2.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by carter):
remarkably, if i add the type annotation, this works! (but it still seems
like a bug in inference)
{{{
data instance Maybe (x :: TYPE 'UnliftedRep) where
MaybeSumU :: (# x | (# #) #) -> Maybe (x :: TYPE 'UnliftedRep)
}}}
it seems kinda redundant ??
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14111#comment:1>
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