#14055: Panic on type error inside a type-level newtype -------------------------------------+------------------------------------- Reporter: luqui | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.2.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * os: MacOS X => Unknown/Multiple * component: Compiler => Compiler (Type checker) * architecture: x86_64 (amd64) => Unknown/Multiple Comment: This doesn't panic on GHC HEAD: {{{ $ ~/Software/ghc3/inplace/bin/ghc-stage2 --interactive Bug.hs GHCi, version 8.3.20170729: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci [1 of 1] Compiling Main ( Bug.hs, interpreted ) Bug.hs:6:18: error: • Expected kind ‘() -> X’, but ‘t -> ()’ has kind ‘*’ • In the first argument of ‘RollX’, namely ‘(t -> ())’ In the type ‘RollX (t -> ())’ In the type family declaration for ‘F’ | 6 | F t = RollX (t -> ()) | ^^^^^^^ }}} 8e15e3d370e9c253ae0dbb330e25b72cb00cdb76 likely fixed this. I'll add a regression test. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14055#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler