[erlang-bugs] maps inside records

[Sergej Jurečko]

Oh right. The #event is just in the print string, not the actual code. The
code compiles and runs.


Sergej

On Mon, Feb 2, 2015 at 9:06 AM, Vlad Dumitrescu <vladdu55@REDACTED> wrote:

> 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
>>
>>
>
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