Parenthesize rank-n contexts in Convert

Authored by RyanGlScott on Thu, Jul 5, 7:50 AM.

Description

Parenthesize rank-n contexts in Convert

Summary: A simple oversight.

Test Plan: make test TEST=T15324

Reviewers: goldfire, bgamari

Reviewed By: bgamari

Subscribers: rwbarton, thomie, carter

GHC Trac Issues: Trac #15324

Differential Revision: https://phabricator.haskell.org/D4910

(cherry picked from commit 57733978482dc1e566a7d4cd90d4cbbd1315e3b2)