#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 JulianLeviston): Have been trying to create the expression referred to by SPJ in comment:24 in `MatchList.hs` but having trouble creating core. {{{ HsRat _ fl ty -> case fl of FL { fl_signi = i, fl_exp = e } -> return (mkApps (Var "makeRational") [(mkIntegerExpr i) (mkIntegerExpr e)]) }}} I don't know how to make a `Var`. The `String` above is clearly wrong, but I couldn't find out how to construct one from scratch. I read through `MkId.hs`, `Id.hs` and `Var.hs` but it's not clear to me what I should be doing. Also, comment:24 refers to making "a new library function" which seems easy enough, but I don't know what a library function is (like... where should it go such that it gets picked up at runtime and registered in the list of available variables, available to core?). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15646#comment:44 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler