[GHC] #10931: layers-0.1 does not compile with ghc-7.10 (likely a regression from ghc-7.8)
GHC
ghc-devs at haskell.org
Tue Oct 6 12:28:06 UTC 2015
#10931: layers-0.1 does not compile with ghc-7.10 (likely a regression from
ghc-7.8)
-------------------------------------+-------------------------------------
Reporter: slyfox | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type | Version: 7.10.2
checker) |
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: GHC rejects | Unknown/Multiple
valid program | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
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Changes (by simonpj):
* cc: goldfire (added)
Comment:
Thanks for a small test case. I've added a test so if this goes wrong
again we'll know.
I have not investigated in detail. Would someone like to git-bisect to
find when it got fixed? I have a horrid feeling that it'll just be part
of some fairly substantial change to the type constraint solver, which we
won't want to merge en-masse to 7.10.3.
As things stand, it's a bug in 7.10 that we don't know how to fix. I'm
sure we could find out, but it'd take precious cycles.
How bad is it if this library doesn't work? I imagine this is relatively
rare else it'd show up more often.
Richard; you might be interested.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10931#comment:3>
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