[erlang-questions] Strange matching behavior

[Lukas Larsson]

Hello,

On Thu, Sep 5, 2019 at 9:39 AM block.rxckin.beats@REDACTED <
block.rxckin.beats@REDACTED> wrote:

> I found strange behavior, see code below.
>
> why last match doesn't works ?
>

It is a bug in the compiler in OTP-22 that has been fixed. If you upgrade
to the latest OTP-22 patched version it works as it should.

Lukas


>
>
> ```main.erl
> #!/usr/bin/env escript
> -module(main).
>
> -mode(compile).
> -compile(export_all).
>
> xy() ->
>     #{ 160506610  => x, 3960650446 => y }.
>
> x() ->
>     #{ 160506610  => x }.
>
> y() ->
>     #{ 3960650446 => y }.
>
> xy2() ->
>     #{ 888888888  => x, 9999999999 => y }.
>
> main(_) ->
>     #{ 160506610  := x } = xy(), % ok
>     #{ 3960650446 := y } = xy(), % ok
>
>     #{ 160506610  := x } = x(), % ok
>     #{ 3960650446 := y } = y(), % ok
>
>
>     #{ 888888888  := x,
>        9999999999 := y
>      } = xy2(), % ok
>
>
>     #{ 160506610  := x,
>        3960650446 := y
>      } = xy(), % no match of right hand side value, WHY ??
>
>     ok.
> ```
>
> Erlang: Erlang/OTP 22 [erts-10.4] [source] [64-bit] [smp:8:8] [ds:8:8:10]
> [async-threads:1] [hipe]
> OS: Ubuntu 19.04 disco
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