[GHC] #11698: GHC's tct_closed flag is not being set correctly

[GHC]

#11698: GHC's tct_closed flag is not being set correctly
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  11656
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by facundo.dominguez):

 I can think of two ways to compute closedness.

 1. Attach the free variables computed during the renaming pass to each
 binding. During type-checking, use these and the type of the binding to
 determine if it is closed.
 2. Compute the free variables during type-checking and determine
 closedness from these alone.

 Is it (1) ok? Maybe it is more convenient than (2)?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11698#comment:5>
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