[proposal] Allow module attributes in binaries length

[Jakub G]

We can use <<5 :: 4>> or <<10 :: 4*3>> to control our binaries' size. 

Why can't we use modules attrib (which are const) to do it? I was kinda suprised this didn't work: <<5 :: @some_attrib * 2>>

[Wojtek Mach]

Perhaps worth mentioning that in order for it to work today it needs to be written as:

<<5::size(@some_attrib)-unit(2)>>

On 2 Nov 2018, at 14:33, Jakub G <jump...@gmail.com> wrote:

We can use <<5 :: 4>> or <<10 :: 4*3>> to control our binaries' size. 

Why can't we use modules attrib (which are const) to do it? I was kinda suprised this didn't work: <<5 :: @some_attrib * 2>>

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[José Valim]

Definitely a bug. Please open a bug report.

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José Valim

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[Jakub G]

I found this issue, is related? https://github.com/elixir-lang/elixir/issues/6273

[José Valim]

No, that’s a separate one. :)