Yuras authored Feb 16, 2016 and Ben Gamari committed Feb 16, 2016

See Trac #9611. In "No instance..." error message we suggest instances
for other types with the same occ name. It is usefull e.g. when we have
two different versions of the same package installed.

Test Plan: typecheck/should_fail/tcfail224

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1919

GHC Trac Issues: #9611