#5686: 'impossible' happened when deriving Functor on a type with a type family
application
--------------------------------+-------------------------------------------
Reporter: patrick_premont | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.2.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
--------------------------------+-------------------------------------------
Comment(by simonpj@…):
commit 88cd0d1fd68ec88dfe843fa14f3895a21e1ca07f
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Mon Dec 12 08:12:18 2011 +0000
Make derived functor stuff watch out for type functions (Trac #5686)
The problem was simply that the side-condition check didn't test for a
type function, and then splitAppTy fell over.
compiler/typecheck/TcDeriv.lhs | 2 +-
compiler/typecheck/TcGenDeriv.lhs | 57
++++++++++++++++++++----------------
2 files changed, 33 insertions(+), 26 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5686#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
