[GHC] #15314: Internal error during typechecking of a hole in GHCi when there's shadowed identifiers

26 Jun 2018

      #15314: Internal error during typechecking of a hole in GHCi when there's shadowed
identifiers
-------------------------------------+-------------------------------------
           Reporter:  mniip          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  GHCi           |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHCi crash
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{#!hs
 GHCi, version 8.4.3: http://www.haskell.org/ghc/  :? for help
 Prelude> let x = ()
 Prelude> let x = ()
 Prelude> :t _

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

 Seems to only happen when there were two identifiers defined with the same
 name.

 As verified by mpickering on IRC this isn't reproducible in 8.2.2.

-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15314
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