[erlang-bugs] maps inside records

[Vlad Dumitrescu]

Hi Sergej,

Is the code you pasted in the mails correct? You have references to both
#event and #ev -- maybe that's the cause?

regards,
Vlad


On Mon, Feb 2, 2015 at 8:23 AM, Sergej Jurečko <sergej.jurecko@REDACTED>
wrote:

>
>
> On Mon, Feb 2, 2015 at 8:04 AM, Björn Gustavsson <bjorn@REDACTED> wrote:
>
>> On Sun, Feb 1, 2015 at 9:47 AM, Sergej Jurecko <sergej.jurecko@REDACTED>
>> wrote:
>> > Tested in 17.3 and 17.4
>> >
>> > Incorrect behavior 1:
>> >
>> > -record(ev,{info}).
>> > test() ->
>> >         test(#ev{info = #{type => dir, name => "My folder"}}).
>> > test(#ev{info = #{type := dir} = I} = E) ->
>> >         io:format("E = ~p~n",[E]),
>> >         io:format("E#event.info = ~p~n",[E#ev.info]),
>> >         io:format("I = ~p~n",[I]).
>> >
>> > Calling test/0 will print:
>> > E = {ev,#{name => "My folder",type => dir}}
>> > E#event.info = #{type => dir}
>> > I = #{name => "My folder",type => dir}
>> >
>> > Why is E#event.info without name field?
>> >
>>
>> The behaviour is the expected.
>>
>> Records are compile-time construct that are translated
>> to tuples. So at run-time the record is a tuple and
>> will be printed as a tuple.
>>
>
>
> Yes but E#event.info value is not a record. It is a map which should
> contain #{type => dir, name => "My folder"}, yet when trying to extract
> that record we only get #{type => dir}.
>
> E#event.info should be the same as I, yet it is not.
>
>
> Sergej
>
> _______________________________________________
> erlang-bugs mailing list
> erlang-bugs@REDACTED
> http://erlang.org/mailman/listinfo/erlang-bugs
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-bugs/attachments/20150202/6e81d41d/attachment.htm>