Pattern generation: Generate patterns using record macros if available (Elixir 1.18+)

[zachallaun]

Given a file point.ex containing:

defmodule Point do
  import Record

  defrecord :point, [:x, :y]
end

You can get information about the point record macro from the docs chunk:

# iex -S mix
iex> Code.fetch_docs(Point)
{:docs_v1, 2, :elixir, "text/markdown", :hidden,
 %{behaviours: [], source_annos: [{1, 1}], source_path: ~c"/home/zacha/dev/libs/mneme/lib/point.ex"},
 [
   {{:macro, :point, 1}, [generated: true, location: 5], ["point(args \\\\ [])"], :none,
    %{record: {:point, [x: nil, y: nil]}, source_annos: [5], defaults: 1}},
   {{:macro, :point, 2}, [generated: true, location: 5], ["point(record, args)"], :none,
    %{source_annos: [5]}}
 ]}

This information combined with the macro environment could be used to potentially generate patterns using record syntax:

defmodule PointTest do
  use ExUnit.Case
  use Mneme

  import Point

  test "add/2" do
    auto_assert point(x: 5, y: 5) <- Point.add(point(x: 1, y: 4), point(x: 4, y: 1))
  end
end

(Note that this auto-assert would currently succeed, but when the asserted value changed, Mneme would only offer tuple suggestions.)