With a file called 𓅖.hs in `C:\Users\acfoltzer`, the following in `cmd.exe`: ``` C:\Users\acfoltzer>chcp 65001 Active code page: 65001 C:\Users\acfoltzer>ghci GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help Prelude> :l C:\cygwin\home\acfoltzer\<TAB> ghc.exe: panic! (the 'impossible' happened) (GHC version 7.10.1 for i386-unknown-mingw32): Enum.toEnum{Word16}: tag (78166) is outside of bounds (0,65535) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug ``` Here, I'm setting the code page first according to the various bits of folk wisdom on the Internet about getting Unicode to properly display in `cmd.exe`. I don't get this crash with a Cygwin terminal, but rather see `??.hs`. I came across this because I was getting the same exception in the Cryptol REPL, so I suspect it's not unique to GHCi, but is rather something fishy in base. <details><summary>Trac metadata</summary> | Trac field | Value | | ---------------------- | ------------ | | Version | 7.10.1 | | Type | Bug | | TypeOfFailure | OtherFailure | | Priority | normal | | Resolution | Unresolved | | Component | GHCi | | Test case | | | Differential revisions | | | BlockedBy | | | Related | | | Blocking | | | CC | hvr | | Operating system | | | Architecture | | </details> <!-- {"blocked_by":[],"summary":"Tab-completing in a directory with Unicode heiroglyph crashes ghci","status":"New","operating_system":"","component":"GHCi","related":[],"milestone":"","resolution":"Unresolved","owner":{"tag":"Unowned"},"version":"7.10.1","keywords":[],"differentials":[],"test_case":"","architecture":"","cc":["hvr"],"type":"Bug","description":"With a file called 𓅖.hs in `C:\\Users\\acfoltzer`, the following in `cmd.exe`:\r\n\r\n{{{\r\nC:\\Users\\acfoltzer>chcp 65001\r\nActive code page: 65001\r\nC:\\Users\\acfoltzer>ghci\r\nGHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help\r\nPrelude> :l C:\\cygwin\\home\\acfoltzer\\<TAB>\r\nghc.exe: panic! (the 'impossible' happened)\r\n (GHC version 7.10.1 for i386-unknown-mingw32):\r\n Enum.toEnum{Word16}: tag (78166) is outside of bounds (0,65535)\r\n\r\nPlease report this as a GHC bug: http://www.haskell.org/ghc/reportabug\r\n}}}\r\n\r\nHere, I'm setting the code page first according to the various bits of folk wisdom on the Internet about getting Unicode to properly display in `cmd.exe`. I don't get this crash with a Cygwin terminal, but rather see `??.hs`.\r\n\r\nI came across this because I was getting the same exception in the Cryptol REPL, so I suspect it's not unique to GHCi, but is rather something fishy in base.","type_of_failure":"OtherFailure","blocking":[]} -->