[GHC] #15428: Oversaturated type family application panicks GHC (piResultTys2)
GHC
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Tue Jul 24 10:21:28 UTC 2018
#15428: Oversaturated type family application panicks GHC (piResultTys2)
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Reporter: RyanGlScott | Owner: (none)
Type: bug | Status: new
Priority: high | Milestone: 8.6.1
Component: Compiler | Version: 8.5
Resolution: | Keywords: TypeInType,
| TypeFamilies
Operating System: Unknown/Multiple | Architecture:
Type of failure: Compile-time | Unknown/Multiple
crash or panic | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Simon Peyton Jones <simonpj@…>):
In [changeset:"e1b5a1174e42e390855b153015ce5227b3251d89/ghc" e1b5a11/ghc]:
{{{
#!CommitTicketReference repository="ghc"
revision="e1b5a1174e42e390855b153015ce5227b3251d89"
Fix a nasty bug in piResultTys
I was failing to instantiate vigorously enough in Type.piResultTys
and in the very similar function ToIface.toIfaceAppArgsX
This caused Trac #15428. The fix is easy.
See Note [Care with kind instantiation] in Type.hs
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15428#comment:4>
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