#12665: Make Read instances faster, and make them fail fast -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: dfeuer Type: feature request | Status: new Priority: high | Milestone: 8.2.1 Component: Core Libraries | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:15 YitzGale]:
Does this still guarantee {{{ read "xxxx" == xxxx }}} for every {{{Fractional}}} literal {{{xxxx}}} that parses, for all built-in instances of `Fractional`? I believe we have that guarantee now.
Thanks to the type-directed nature of `Read`, it shouldn't affect them one bit. And if it does, we can certainly fix that. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12665#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler