On Tue, 30 Sep 2014 17:33:51 +0200, Emilio De Camargo Francesquini <francesquini@gmail.com> wrote:

:

GHCi, version 7.8.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> let x = 3 + 4
Prelude> :print x
x = (_t1::Num a => a)
Prelude> :force x
x = _
Prelude> print _t1
ghc: panic! (the 'impossible' happened)
  (GHC version 7.8.3 for x86_64-unknown-linux):
    tcTyVarDetails a{tv atm} [tv]

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


Is it really a bug or is it something I really shouldn't be doing?

It seems to me that _t1 is a temporary name, therefore it is not meaningful to print _t1; GHCi should give a message telling that _t1 is not defined, not a panic message. It is best to write a bug report for this.

Regards,
Henk-Jan van Tuyl


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