[erlang-bugs] Parser bug: if missing ", " in list between records, the first is ignored, and no parser warnings are given.

[Vlad Dumitrescu]

Hi Mattias,

This isn't a bug. The expression #rec{a=2}#rec{b=3} is legal, and is the
same thing as (#rec{a=2})#rec{b=3} or #rec{a=2,b=3}. If the keys overlap,
then the last one "wins".

best regards,
Vlad


On Thu, Nov 6, 2014 at 9:21 AM, Mattias Waldau <mattias.waldau@REDACTED>
wrote:

>  This is the program
>
> -module('missing-comma-not-detected').
>
> -export([data/1]).
>
> -compile(export_all).
>
> -record(shcnode, {
>       nodename :: any(),
>       y_axis :: number(),
>       children :: [any()],
>       article_number :: number(),
>       attribute_condition :: string()}).
>
>
> data(1) ->
>     [
>      #shcnode{nodename = start, y_axis = 0, children = [d1285]},
>      #shcnode{nodename = d1285, y_axis = 295, children = [1939, 1940]}
>      #shcnode{nodename = 1940, y_axis = 525, children = [bm3203],
> article_number = 14432861},
>      #shcnode{nodename = 1939, y_axis = 530, children = [bm3203],
> article_number = 14432860},
>      #shcnode{nodename = bm3203, y_axis = 915, children = []}
>     ].
>
>
> Note the missing "," after  [1939, 1940]}
>
> Only 4 rows are detected
>
> length('missing-comma-not-detected':data(1)).
> 4
>
> ---
>
> If I add the comma, I get
>
> length('missing-comma-not-detected':data(1)).
> 5
>
> ----
>
> I am using Erlang 17.3 on ubuntu.
>
> erlang:system_info(otp_release).
> "17"
>
> 36>  erl -V
> Eshell V6.2  (abort with ^G)
> 1>
>
> ---
>
> Thanks,
>
> Mattias
>
>
>
>
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>
>
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