Re: [elixir-core:8489] What does %Mod{} really do?

[José Valim]

Please do a bug report. We should either raise or just trust the value returned by __struct__/0 since we don't validate it anywhere else.

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

On Fri, Feb 15, 2019 at 2:47 PM Mário Guimarães <mario.luis...@gmail.com> wrote:

Hello,

given the files `xx.ex` and `yy.ex` defined as

defmodule XX do
  defstruct [:field]
end

defmodule YY do
  defdelegate __struct__, to: XX
  defdelegate __struct__(x), to: XX
end

why does 

iex(1)> %XX{} == XX.__struct__()
true

and 

iex(2)> %YY{} == YY.__struct__()
false

?

It seems that %Mod{} is not equivalent to Mod.__struct__().

What does %Mod{} really do?

Thanks

Mário

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[Mário Guimarães]

Ok, I will write a report 

[Mário Guimarães]

Reported on https://github.com/elixir-lang/elixir/issues/8800