Using a (meaningless) generic currency sign (¤) instead of $ causes panicing
The following two lines of HS produces the reported error. It was actually a mistype and probably not that serious, but I was told to report it.
The issue is combining the "generic currency" symbol ¤ with the Integral constraint (using e.g. Integer instead as the constraint does not produce the same error).
Prelude> let ones x = snd $ divMod x 10
Prelude> ones ¤ (5 :: Integral)
ghc: panic! (the 'impossible' happened)
(GHC version 8.0.2 for x86_64-unknown-linux):
initTc: unsolved constraints
WC {wc_insol =
[W] ¤_a2l9 :: t_a2l8[tau:1] (CHoleCan: ¤)
[W] ¤_a2lJ :: t_a2lI[tau:1] (CHoleCan: ¤)}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | low |
Resolution | Unresolved |
Component | GHCi |
Test case | |
Differential revisions | |
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Blocking | |
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