#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: #5692 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by JulianLeviston): This is the error (`./boot && ./configure && make -j4`): {{{ WARNING: file compiler/iface/LoadIface.hs, line 428 GHC.Real GHC error in desugarer lookup in GHC.Real: Can't find interface-file declaration for variable mkRational Probable cause: bug in .hi-boot file, or inconsistent .hi file Use -ddump-if-trace to get an idea of which file caused the error ghc-stage1: panic! (the 'impossible' happened) (GHC version 8.7.20181219 for x86_64-apple-darwin): initDs Please report this as a GHC bug: https://www.haskell.org/ghc/reportabug make[1]: *** [libraries/base/dist-install/build/GHC/Real.o] Error 1 make: *** [all] Error 2 }}} I'll make an MR now... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15646#comment:71 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler