decorate_arg errors out if arg_ast is not a tuple

[imeraj]

While playing with the code here, I encountered an issue in decorate_arg function -

apex/lib/apex/awesome_def.ex

Line 57 in ca3cfbc

if elem(arg_ast, 0) == :\\ do

Looks like if there is pattern matching like

  deftraceable foo(_, 0) do
    :error
  end

This line throws an error -

== Compilation error in file tracer_test.exs ==
** (ArgumentError) errors were found at the given arguments:

  * 2nd argument: not a tuple

    :erlang.element(1, 0)
    tracer.exs:55: Tracer.decorate_args/1
    (elixir 1.14.4) lib/enum.ex:1658: Enum."-map/2-lists^map/1-0-"/2
    (elixir 1.14.4) lib/enum.ex:1658: Enum."-map/2-lists^map/1-0-"/2
    tracer.exs:50: Tracer.decorate_args/1
    tracer_test.exs:6: (module)

I had to make below change to make the code work -

if is_tuple(arg_ast) and elem(arg_ast, 0) == :\\ do