#15037: Running 1 twice, followed by a typed hole, in GHCi causes internal error -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: GHCi | Version: 8.5 Keywords: TypedHoles | 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: -------------------------------------+------------------------------------- Originally reported in https://ghc.haskell.org/trac/ghc/ticket/14996#comment:2. You need GHC HEAD (i.e., more recent than GHC 8.4.1) to trigger this: {{{ $ inplace/bin/ghc-stage2 --interactive GHCi, version 8.5.20180413: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci λ> 1 1 λ> 1 1 λ> _ <interactive>:1:1: error: GHC internal error: ‘Ghci1.it’ is not in scope during type checking, but it passed the renamer tcl_env of environment: [] }}} And yes, running `1` //twice// seems to be critical to triggering this bug, for some reason. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15037 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler