Re: [GHC] #15413: Poor error message when trying to import non-existent class methods

#15413: Poor error message when trying to import non-existent class methods -------------------------------------+------------------------------------- Reporter: | Owner: (none) quasicomputational | Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.2 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: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones ): In [changeset:"f7d3054a133247cea1f488993695d3cbb941f29d/ghc" f7d3054a/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="f7d3054a133247cea1f488993695d3cbb941f29d" Improve error message on un-satisfied import Consider import M( C( a,b,c ) ) where class C is defined as module M where class C x where a :: blah c :: blah Tnen (Trac #15413) we'd like to get an error message only about failing to import C( b ), not C( a,b,c ). This was fairly easy (and local) to do. Turned out that the existing tests mod81 and mod91 are adequate tests for the feature. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15413#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler