#16093: mkPluginUsage: file not found -------------------------------------+------------------------------------- Reporter: lerkok | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I've been trying to track down another plugin issue when I ran into this one. I have the following `TestPlugin.hs` file: {{{#!hs module TestPlugin (plugin) where import GhcPlugins plugin :: Plugin plugin = defaultPlugin {installCoreToDos = install} where install _ todos = return (test : todos) test = CoreDoPluginPass "Test" return }}} And the following `Test.hs` file: {{{#!hs {-# OPTIONS_GHC -fplugin TestPlugin #-} main :: IO () main = return () }}} They are both in the same directory. With ghc 8.4.2, I have: {{{ $ ghci-8.4.2 -package ghc Test.hs GHCi, version 8.4.2: http://www.haskell.org/ghc/ :? for help [1 of 2] Compiling TestPlugin ( TestPlugin.hs, interpreted ) [2 of 2] Compiling Main ( Test.hs, interpreted ) Ok, two modules loaded. }}} But with ghc 8.6.3, I get: {{{ $ ghci-8.6.3 -package ghc Test.hs GHCi, version 8.6.3: http://www.haskell.org/ghc/ :? for help [1 of 2] Compiling TestPlugin ( TestPlugin.hs, interpreted ) [2 of 2] Compiling Main ( Test.hs, interpreted ) ghc: panic! (the 'impossible' happened) (GHC version 8.6.3 for x86_64-apple-darwin): mkPluginUsage: file not found TestPlugin ./TestPlugin.o Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable pprPanic, called at compiler/deSugar/DsUsage.hs:234:15 in ghc:DsUsage Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} My original problem was different actually, so if you can suggest at least a workaround for this without actually fixing it I can proceed to replicate the other one. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16093 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler