[GHC] #13508: Clarify Some Restrictions on Compact Regions

[GHC]

#13508: Clarify Some Restrictions on Compact Regions
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        Reporter:  andrewthad        |                Owner:  ezyang
            Type:  bug               |               Status:  patch
        Priority:  lowest            |            Milestone:  8.2.1
       Component:                    |              Version:  8.1
  libraries/compact                  |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3407
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"38f9eadd8e4746c2fabf83045073134f5a554a06/ghc" 38f9ead/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="38f9eadd8e4746c2fabf83045073134f5a554a06"
 compact: Clarify mutability restriction

 Fixes #13508.

 [skip ci]

 Test Plan: Read it

 Reviewers: austin

 Subscribers: rwbarton, thomie

 Differential Revision: https://phabricator.haskell.org/D3407
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13508#comment:3>
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