#9046: Panic in GHCi when using :print -------------------------------------+------------------------------------- Reporter: quchen | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.8.4 Component: GHCi | Version: 7.8.2 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: GHCi crash | Blocked By: Test Case: | Related Tickets: tests/ghci.debugger/scripts/print036| Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by francesquini): Same problem, different steps: {{{ GHCi, version 7.8.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> let x = 3 + 4 Prelude> :print x x = (_t1::Num a => a) Prelude> :force x x = _ Prelude> print _t1 ghc: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-linux): tcTyVarDetails a{tv atm} [tv] }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9046#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler