[GHC] #15007: Don't keep shadowed variables in ghci, both renamer and type checker

[GHC]

#15007: Don't keep shadowed variables in ghci, both renamer and type checker
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        Reporter:  sighingnow        |                Owner:  sighingnow
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  GHCi              |              Version:  8.5
      Resolution:                    |             Keywords:  TypedHoles
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11547 #14052     |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Similar shenanigans:

 {{{
 $ ~/Software/ghc/inplace/bin/ghc-stage2 --interactive
 GHCi, version 8.5.20180420: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/rgscott/.ghci
 λ> data F
 λ> data F
 λ> _

 <interactive>:1:1: error:
     GHC internal error: ‘Ghci1.$trModule’ is not in scope during type
 checking, but it passed the renamer
     tcl_env of environment: []
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15007#comment:3>
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