Change case order in SyntaxSugar.transform_expression/2 to handle already expanded AST

[hmy3743]

This is Pull request to fix bug happened in my code

typed_schema is not work properly inside custom macro code. AST is already expanded before transform_expression called. So :__block__ nested function call is not work

below code is summary of my macro code

defmacro typed_schema(name, do: {function_name, ctx, args}) do
  fields = {function_name, ctx, Enum.map(args, &put_null_false/1)}

  quote do
    @timestamps_opts [type: :utc_datetime]

    TypedEctoSchema.typed_schema unquote(name) do
      unquote(fields)

      timestamps()
    end
  end
end

Thanks :)

[dvic]

@hmy3743 I fixed the CI, can you please rebase this PR on the latest master branch?

[hmy3743]

Sorry for the delay :) I've rebased and pushed the branch.

[dvic]

LGTM! Can you add a basic test case in test/typed_ecto_schema_test.exs so we don't miss this in future refactorings?

[dvic]

Thanks for the test, is there a way for you to add the previous code (that failed to compile) in the test instead? just with some basic assertion that checks we compiled the right thing :)

[dvic]

Thanks!