#3676: realToFrac doesn't sanely convert between floating types -------------------------------------+------------------------------------- Reporter: draconx | Owner: Type: bug | Status: new Priority: normal | Milestone: ⊥ Component: Core Libraries | Version: 6.12.1 Resolution: | Keywords: report-impact Operating System: Unknown/Multiple | Architecture: x86_64 | (amd64) Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by Rufflewind): * cc: ekmett (added) Comment: I think it would be a useful to at least note this problem in the docs for `realToFrac`: {{{ -- | general coercion to fractional types -- -- Warning: avoid using this function to convert between floating-point -- number types. Consider using 'GHC.Float.float2Double' and -- 'GHC.Float.double2Float' instead. See -- <https://ghc.haskell.org/trac/ghc/ticket/3676 GHC bug #3676>. }}} (Incidentally, the documentation for `GHC.Float` is hidden from the users.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3676#comment:24 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler