Ben Gamari authored Mar 11, 2016 and Ben Gamari committed Mar 11, 2016

Previously
```lang=haskell
catch (error "uh oh") (\(_ :: SomeException) -> print "it failed")
```
would unexpectedly fail with "uh oh" instead of the handler being run
due to the strictness of `catch` in its first argument. See #11555 for
details.

Test Plan: Validate

Reviewers: austin, hvr, simonpj

Reviewed By: simonpj

Subscribers: simonpj, thomie

Differential Revision: https://phabricator.haskell.org/D1973

GHC Trac Issues: #11555