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

[José Valim]

I have rebuilt Erlang from master and both the test and the code snippet
you sent by e-mail works. In order to discard any encoding issue in the
process, can you please push your code snippets to a repository?



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

On Thu, May 4, 2017 at 8:04 AM, José Valim <jose.valim@REDACTED>
wrote:

> 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/sr
>> c/unicode_usage.xml#L66-L71
>>
>> _______________________________________________
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>>
>>
>
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