[erlang-questions] Strange problems with modifying records with matched maps on 17.4

Björn-Egil Dahlberg <>
Tue Mar 24 18:09:16 CET 2015


On current maint + egil/fix-term-cmp/OTP-12623 (what jesper reported):

egil/fix-term-cmp/OTP-12623  
/ldisk/egil/git/otp/erts/emulator $ ../../bin/erl -s map_test1 main
Erlang/OTP 17 [erts-6.3.1] [source-8c0c99b] [64-bit] [smp:8:8] 
[async-threads:10] [hipe] [kernel-poll:false]

Created: {r1,#{count => 1},0}
Modified: {r1,#{count => 2},0}
Eshell V6.3.1  (abort with ^G)
1>

Seems ok.

// Björn-Egil

On 2015-03-24 12:38, Max Lapshin wrote:
> Thanks
>
> On Tue, Mar 24, 2015 at 2:25 PM, Sergej Jurečko 
> < <mailto:>> wrote:
>
>     Yes this is likely the same bug that I reported in february:
>     http://erlang.org/pipermail/erlang-bugs/2015-February/004768.html
>
>
>     Sergej
>
>     On Tue, Mar 24, 2015 at 12:21 PM, Max Lapshin
>     < <mailto:>> wrote:
>
>         https://gist.github.com/maxlapshin/a95d8a27ce93221d883a
>
>         when I match map in record:
>
>         modify(#r1{map_data = #{count := Cnt} = M}=R1) ->
>
>         I get badarg when modify record in the end of function.
>
>         I've attached two files looking similar in the gist.
>
>
>
>
>         When I launch first, I get badarg with the line of function
>         header:
>
>         erl -s map_test1 main
>
>         Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:4:4]
>         [ds:4:4:10] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]
>
>         Created: {r1,#{count => 1},0}
>
>         {"init terminating in
>         do_boot",{badarg,[{map_test1,modify,1,[{file,"map_test1.erl"},{line,11}]},{map_test1,main,0,[{file,"map_test1.erl"},{line,8}]},{init,start_it,1,[]},{init,start_em,1,[]}]}}
>
>
>         when I launch second, it works (but makes useless work).
>
>
>         Is it a known bug? Or maybe it is not a bug, but just my
>         misunderstanding?
>
>
>
>
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