Ben Gamari authored Mar 24, 2016 and Ben Gamari committed Mar 24, 2016

As discussed in #2530 we are going to continue to produce parentheses
here in order to preserve compatibility with previous GHC releases. It
was found that dropped parentheses would break some testsuites which
compared against output from Show. This has been documented in the users
guide.

This reverts commit 5692643c.

Test Plan: Validate

Reviewers: hvr, austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2027

GHC Trac Issues: #2350