[GHC] #9802: A ghci bug

[GHC]

#9802: A ghci bug
-------------------------------------+-------------------------------------
              Reporter:  vxanica     |            Owner:
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:
             Component:  GHCi        |          Version:  7.8.3
            Resolution:  duplicate   |         Keywords:  :force :type
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  GHCi crash  |       Blocked By:
             Test Case:              |  Related Tickets:  #9046
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => closed
 * failure:  None/Unknown => GHCi crash
 * resolution:   => duplicate
 * related:   => #9046


Old description:

> Prelude> let a = [1,2,3]
> (0.00 secs, 0 bytes)
> Prelude> :t a
> a :: Num t => [t]
> Prelude> :force a
> a = _
> Prelude> a
> [1,2,3]
> (0.02 secs, 3580816 bytes)
> Prelude> :print a
> a = (_t1::Num t => [t])
> Prelude> :t _t1
> ghc.exe: panic! (the 'impossible' happened)
>   (GHC version 7.8.3 for x86_64-unknown-mingw32):
>         tcTyVarDetails t{tv auB} [tv]
>

> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

New description:

 {{{
 #!haskell
 Prelude> let a = [1,2,3]
 (0.00 secs, 0 bytes)
 Prelude> :print a
 a = (_t1::Num t => [t])
 Prelude> :t _t1
 ghc.exe: panic! (the 'impossible' happened)
   (GHC version 7.8.3 for x86_64-unknown-mingw32):
         tcTyVarDetails t{tv auB} [tv]
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9802#comment:1>
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