[GHC] #15867: STG scope error

[GHC]

#15867: STG scope error
-------------------------------------+-------------------------------------
        Reporter:  csabahruska       |                Owner:  sgraf
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.7
      Resolution:                    |             Keywords:  CodeGen
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5310
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by sgraf):

 Hmm. I'm inclined to accept the shadowing, it's like nested lambdas, after
 all. Also, since free var occurrences never were a problem before
 (presumably because `StgToCmm` nubs them anyway) and since there are plans
 in #15754 to get rid of that field altogether, I'm not sure if this really
 is a sensible thing to lint for.

 No doubt, the STG is extremely fishy, but if we are going to remove FV
 occs from `StgRhsClosure` anyway, I don't see great value in fixing these
 non-severe bugs. Simon is free to overrule me here, in which case I'd be
 happy to fix this.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15867#comment:12>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler