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

[Loïc Hoguin]

It is legal but there probably should be a warning for this particular 
case. I cannot think of a valid reason to do #rec{a=2}#rec{b=3} when you 
can just do #rec{a=2, b=3}.

On 11/07/2014 10:09 AM, Vlad Dumitrescu wrote:
> 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 <mailto: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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-- 
Loïc Hoguin
http://ninenines.eu