#12123: GHC crashes when calling typeRep on a promoted tuple -------------------------------------+------------------------------------- Reporter: MikeIzbicki | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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: -------------------------------------+------------------------------------- The following code (asking for the typeRep of a promoted tuple) causes GHC to crash. {{{ import Data.Typeable import Data.Proxy x = typeRep (Proxy::Proxy '(Int,Int)) }}} The error message is: {{{ [1 of 1] Compiling Main ( ../Bug.hs, interpreted ) GHC error in desugarer lookup in Main: Can't find interface-file declaration for variable $tc'(,) 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-stage2: panic! (the 'impossible' happened) (GHC version 8.1.20160518 for x86_64-unknown-linux): initDs IOEnv failure }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12123 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler