#7437: peculiar behaviour with default instances and type variables -------------------------------------+------------------------------------- Reporter: bos | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: Component: Test Suite | Version: 7.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: Related Tickets: #12151 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): In [changeset:"85aa6ef09346e841abf4e089b24c7f783286cd74/ghc" 85aa6ef0/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="85aa6ef09346e841abf4e089b24c7f783286cd74" Check generic-default method for ambiguity Fixes Trac #7497 and #12151. In some earlier upheaval I introduced a bug in the ambiguity check for genreric-default method. This patch fixes it. But in fixing it I realised that the sourc-location of any such error message was bogus, so I fixed that too, which involved a slightly wider change; see the comments with TcMethInfo. }}} The commit message has a typo about the ticket. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7437#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler