niteria authored Nov 11, 2015 and Ben Gamari committed Nov 11, 2015

When you reverse the order of uniques you get the core lint
error from the testcase. The testcase is copied from
tests/simplCore/should_compile/T10689a.hs.

The problem is that we would put type and kind variables ordered by
unique order, which happened to be the right order for this testcase to
pass under normal conditions.

I think it's enough to sort them with `sortQuantVars`, but I'm not
really sure if some more sophisticated dependency analysis isn't needed.

Test Plan: added a new testcase

Reviewers: simonpj, goldfire, simonmar, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1457