[commit: ghc] master: Improve error message on un-satisfied import (f7d3054)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/f7d3054a133247cea1f488993695d3cbb941f29d/ghc

>---------------------------------------------------------------

commit f7d3054a133247cea1f488993695d3cbb941f29d
Author: Simon Peyton Jones <simonpj at microsoft.com>
Date:   Wed Jul 25 11:21:36 2018 +0100

    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.


>---------------------------------------------------------------

f7d3054a133247cea1f488993695d3cbb941f29d
 compiler/rename/RnNames.hs          | 79 ++++++++++++++++++++++---------------
 testsuite/tests/module/mod81.stderr |  4 +-
 testsuite/tests/module/mod91.stderr |  3 +-
 3 files changed, 51 insertions(+), 35 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc f7d3054a133247cea1f488993695d3cbb941f29d