Hello,
That, however, does not explain why
Prelude> :force x
x = _
did not evaluate "x". I finally found the related bug and apparently it is
indeed a known problem: https://ghc.haskell.org/trac/ghc/ticket/9046
Thanks!
Emilio
2014-10-01 9:02 GMT-03:00 Henk-Jan van Tuyl
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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