How is `to_doc/2` imported into `Inspect.Map`?

lud · December 22, 2024, 3:27pm

If you paste the whole code from

defimpl Inspect, for: Map do
# ...
end

into an Elixir shell, you will get “undefined function color/3” and a bunch or errors for other undefined functions.

I wonder how that code has access to color/3, concat/2, container_doc/6 and to_doc/2.

I’ll ping @josevalim , hope you don’t mind <3 !

al2o3cr · December 22, 2024, 5:13pm

lib/elixir/lib/inspect.ex imports the Inspect.Algebra module at the top of the file:

github.com

elixir-lang/elixir/blob/462f614e79cd0e67de83f05053fddb26495269a8/lib/elixir/lib/inspect.ex#L2


      
          import Kernel, except: [inspect: 1]
          import Inspect.Algebra
          
          alias Code.Identifier
          
          defprotocol Inspect do
            @moduledoc """
            The `Inspect` protocol converts an Elixir data structure into an
            algebra document.
          
            This is typically done when you want to customize how your own
            structs are inspected in logs and the terminal.

lud · December 22, 2024, 5:36pm

l knew you could alias outside of a module, but import no …

Thank you