[erlang-questions] Erlang/OTP 20.0, atoms and function names with Unicode

[José Valim]

Hi derek,

I have sent a PR that improves the coverage around this feature:
https://github.com/erlang/otp/pull/1439

The test currently passes on an old master reference. I will rebuild my
development VM from master and follow up.



*José Valim*
www.plataformatec.com.br
Skype: jv.ptec
Founder and Director of R&D

On Thu, May 4, 2017 at 1:11 AM, derek <denc716@REDACTED> wrote:

>
> I found this feature from some of the merged PRs of Erlang/OTP 20
>
> https://github.com/erlang/otp/blob/master/lib/stdlib/doc/
> src/unicode_usage.xml#L66-L71
> https://github.com/erlang/otp/pulls?q=unicode
>
> > Erlang/OTP 20.0, atoms and function can contain Unicode characters
>
> so I built the binary from git checked out source code (from revision
> efcb91bce) and play with it: it seems in escript interpreting mode it
> works, but compiling mode still has errors:
>
> ➸ cat ./hello.erl
> #!/usr/bin/env escript
> %% -*- coding: utf-8 -*-
> %%! +pc unicode
>
> -module(hello).
> %-mode(compile).
> -export([main/1, 'hello_юникод_世界'/0]).
>
> main(_) ->
>   % io:format("~p~n", [{io:printable_range(), io:getopts()}]),
>   % 'hello_'(),
>   io:setopts([{encoding,unicode}]),
>   % io:format("~p~n", [{io:printable_range(), io:getopts()}]),
>   'hello_юникод_世界'(),
>   io:format("~tp~n", [{"Hello, 世界, юникод"}]).
>
> 'hello_юникод_世界'() ->
>   io:format("~tp~n", [{'hello_юникод', <<"Hello, 世界; юникод"/utf8>>,
> "Hello, 世界; юникод"}]).
>
> ➸ erlang20 ./hello.erl
> {'hello_юникод',<<"Hello, 世界; юникод"/utf8>>,"Hello, 世界; юникод"}
> {"Hello, 世界, юникод"}
>
> If I uncomment the "-mode(compile)." line, it just runs into compilation
> error (same as below shell compilation errors)
>
> Or in the Erlang shell, trying to compile it just failed: (I have to
> remove (or comment out) the first "#!/usr/bin/env escript" line)
>
> ➸ erlang20
> Erlang/OTP 20 [DEVELOPMENT] [erts-9.0] [source-efcb91bce] [64-bit]
> [smp:8:8] [ds:8:8:10] [async-threads:10] [hipe] [kernel-poll:false]
>
> Eshell V9.0  (abort with ^G)
> 1> c(hello).
> hello.erl: internal error in beam_asm;
> crash reason: badarg
>
>   in function  list_to_binary/1
>      called as list_to_binary([[5,104,101,108,108,111],
>   [4,109,97,105,110],
>   [2,105,111],
>   [7,115,101,116,111,112,116,115],
>   [6,102,111,114,109,97,116],
>   [15,104,101,108,108,111,95,1102,1085,1080,1082,1086,1076,
> 95,19990,30028],
>   "\vmodule_info",
>   [6,101,114,108,97,110,103],
>   [15,103,101,116,95,109,111,100,117,108,101,95,105,110,102,111]])
>   in call from beam_asm:chunk/3 (beam_asm.erl, line 213)
>   in call from beam_asm:build_file/8 (beam_asm.erl, line 97)
>   in call from beam_asm:module/4 (beam_asm.erl, line 31)
>   in call from compile:beam_asm/1 (compile.erl, line 1370)
>   in call from compile:'-internal_comp/4-anonymous-1-'/2 (compile.erl,
> line 329)
>   in call from compile:fold_comp/3 (compile.erl, line 355)
>   in call from compile:internal_comp/4 (compile.erl, line 339)
> error
> 2>
>
> I have looked up in many of the commit messages, still not seeing a good
> example of how to use unicode in function names? Could some developer
> behind this feature give more examples?
> https://github.com/erlang/otp/blame/master/lib/stdlib/doc/
> src/unicode_usage.xml#L66-L71
>
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>
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