#11695: On GHCi prompt the arrow (movement) keys create strange character sequences --------------------------------------+--------------------------------- Reporter: heisenbug | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.1 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+--------------------------------- Fire up `GHCi` and sit on the arrow down (or left) keys. This is what I get after constantly pressing for some time: {{{ $ ghci GHCi, version 8.1.20160202: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/ggreif/.ghci Prelude> OBOBOBBOBOBOBOBOBOBOBCOCCOCOCCOCCOC <interactive>:1:1: error: Data constructor not in scope: OBOBOBBOBOBOBOBOBOBOBCOCCOCOCCOCCOC }}} When such a strange letter appears, there is also a blinking of the terminal. It is not happening on Windows. I have seen it on RHEL5 and RHEL6. Pretty annoying, especially when you want to quickly navigate in the repl. This is probably a `haskeline` bug, but I am coming here to see whether others suffer from it too, i.e. is it reproducible for elseone? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11695 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler