Also supporting :dbg.fun2ms/1 ?

[sinorga]

Hi,
First of all, thanks for the nice libraray. 😄

I am playing around the :dbg module in Elixir recently. I noticed I can't use the builtin match_spec functions with :dbg.fun2ms/1 in Elixir. So will this library plans to support it too?
Example:

iex(13)> :dbg.fun2ms(fn(_) -> return_trace() end)
** (CompileError) iex:13: undefined function return_trace/0
    (elixir) src/elixir_fn.erl:21: anonymous fn/3 in :elixir_fn.expand/3
    (stdlib) lists.erl:1239: :lists.map/2
    (elixir) src/elixir_fn.erl:26: :elixir_fn.expand/3

So my workaround is using atom as function and warpping the tuple manualy of :dbg.fun2ms/1 output.

iex(13)> :dbg.fun2ms(fn(_) -> :return_trace end)
[{:_, [], [:return_trace]}]
iex(14)> # Wrapping the ruple [{:_, [], [{:return_trace}]}]

But it quite inconvenient.
I'm wondering if I used it in the wrong way or people use match spec directly without this kind of helper functions. I can't find related topics about this issue. I only saw Elixir is going to Deprecate usage of parse_transforms(elixir-lang/elixir#5762) and point to here. so I think maybe here is the right place to ask the question. 😄