#14438: Using a (meaningless) generic currency sign (¤) instead of $ causes panicing --------------------------------------+--------------------------------- Reporter: Izmaki | Owner: (none) Type: bug | Status: new Priority: low | Milestone: Component: GHCi | Version: 8.0.2 Keywords: ¤ | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+--------------------------------- 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). {{{#!hs 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 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14438 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler