#15646: ghci takes super long time to find the type of large fractional number -------------------------------------+------------------------------------- Reporter: Johannkokos | Owner: | JulianLeviston Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: GHCi | Version: 8.4.3 Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): Could you submit your patch to Phabricator? It's really hard to review it this way. I haven't looked at the patch in details yet, but the desugaring in comment:41 is not right. We want to avoid building a rational in compile time (the `Integer` components of `Rational` is what's taking all the time), but that's what you're doing in the code in comment:41 (in `readRational`). See comment:24 for how we want to desugar this. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15646#comment:42 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler