[elixir-core:10710] [Proposal] Add a shortcut to access a struct within the module where it is defined

[Tim Masliuchenko]

It is common to define a struct together with various functions that access 
that struct in the module:

    defmodule Chat.Channel do
      defstruct name: "", public?: true
    
      def new do
        %Chat.Channel{name: "Untitled"}
      end

      def connect(%Chat.Channel{} = channel) do
        IO.inspect(channel)
      end
    end

It is also common to alias the struct for easier access

    defmodule Chat.Channel do
      defstruct name: "", public?: true
    
      alias Chat.Channel
      
      # ...
    end

But, say, renaming the module would require manually replacing all struct 
occurrences with the new module name. Aliasing can help, but if the last 
bit should be updated too(say Chat.Channel should be updated to Chat.Room) 
it would still require to manually replace everything.

There is a workaround to use __MODULE__, but IMO the code looks a bit ugly

    defmodule Chat.Channel do
      defstruct name: "", public?: true
    
      def new do
        %__MODEUL__{name: "Untitled"}
      end
    
      def connect(%__MODEUL__{} = channel) do
        IO.inspect(channel)
      end
    end

I think It would be great to have some kind of shortcut(syntactic sugar) to 
access the struct within the module.
First I thought about something like %_(%%, %. etc) but this way it looks a 
bit cryptic 

    def connect(%_{} = channel) do

So maybe something like %self would work

    defmodule Chat.Channel do
      defstruct name: "", public?: true
    
      def new do
        %self{name: "Untitled"}
      end
    
      def connect(%self{} = channel) do
        IO.inspect(channel)
      end
    end

What do you think?

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