Fix a -Wincomplete-uni-patterns warning
This warning will soon be enabled by -Wall.
Reviewers: bgamari
GHC Trac Issues: #15656
Differential Revision: https://phabricator.haskell.org/D5442
This warning will soon be enabled by -Wall.
Reviewers: bgamari
GHC Trac Issues: #15656
Differential Revision: https://phabricator.haskell.org/D5442