ERL-424: Unicode Characters Not Displayed Correctly In Windows Console

[OTP-Maintainer]

Original reporter: onoriocatenacci
Affected version: OTP-19.0
Component: erl_interface
Migrated from: https://bugs.erlang.org/browse/ERL-424

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I have seen this issue [ERL-361|https://bugs.erlang.org/browse/ERL-361] and this seems related.  However the fix indicated in that issue doesn't work here.  

Reproduction Steps:
1.) Open Erl
2.) Paste: "ł".
3.) Output displayed is "l"

I've tried setting the console code page to both 65001 and 852 (since the character in question is Polish as far as I know) and neither fixes the issue.  However when I set the code page to 852 instead of getting "l" I get [136].

Windows 10 Pro x64 (Build 14393.1198)
OTP 19.

Any suggestions?

[OTP-Maintainer]

dgud said:

The expected result of
1>  "ł".  is
[322]

erl on windows uses oldshell which only support ascii characters.

If you want strings (lists) with unicode codepoints to be displayed you will need to start erlang with +pc unicode

werl +pc unicode
1> "ł".
"ł".

Use werl on windows, (and select a font that can display unicode chars)
> io:format("[322,10]").
"ł".

erl  on windows or erl -oldshell  on linux
1> io:format([322,10]).
\x{142}

I don't know how input/pasting works in shell on windows or what you get there, I guess it depends on the shell as well, msys/cygwin/cmd.