[GHC] #13601: GHC errors but hangs

[GHC]

#13601: GHC errors but hangs
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  TypeInType,
                                     |  LevityPolymorphism
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13819            |  Differential Rev(s):  Phab:D3794
       Wiki Page:                    |
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"424ecadbb3d06f4d4e0813de670369893e1da2a9/ghc"
 424ecadb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="424ecadbb3d06f4d4e0813de670369893e1da2a9"
 Add regression tests for #13601, #13780, #13877

 Summary:
 Some recent commits happened to fix other issues:

 * c2417b87ff59c92fbfa8eceeff2a0d6152b11a47 fixed #13601 and #13780
 * 8e15e3d370e9c253ae0dbb330e25b72cb00cdb76 fixed the original program in
 #13877

 Let's add regression tests for each of these to ensure they stay fixed.

 Test Plan: make test TEST="T13601 T13780a T13780c T13877"

 Reviewers: goldfire, bgamari, austin

 Reviewed By: bgamari

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #13601, #13780, #13877

 Differential Revision: https://phabricator.haskell.org/D3794
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13601#comment:9>
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