[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):

 The definition reads
 {{{
 Definition:
    A variable is "closed", and has tct_closed set to TopLevel,
 iff
    a) all its free variables are imported, or are let-bound with closed
 types
    b) generalisation is not restricted by the monomorphism restriction
 }}}
 I suppose that (a) should read instead:
 {{{
    a) all its free variables are imported, or are let-bound and closed.
 }}}
 i.e. not only the type must be closed, the defining term should be as
 well.

 If closed types are required for a binding to be closed, then a new item
 (c) should be added asking for it, unless (a) implies that somehow:
 {{{
 Definition:
    A variable is "closed", and has tct_closed set to TopLevel,
 iff
    a) all its free variables are imported, or are let-bound and closed
    b) generalisation is not restricted by the monomorphism restriction
    c) it has a closed type
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11698#comment:3>
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