Inconsistent compiler trace events for super calls and captures

[lukaszsamson]

Elixir and Erlang/OTP versions

Erlang/OTP 27 [erts-15.2.3] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit]

Elixir 1.18.3 (compiled with Erlang/OTP 27)

Operating system

any

Current behavior

Given a compile tracer

defmodule MyTracer do
  def trace(event, _env) do
    dbg(event)
    :ok
  end
end
Code.put_compiler_option(:tracers, [MyTracer])

1. super call does not emit any events

defmodule OverFunCall do
  def fun(x) do
    1
  end

  defoverridable [fun: 1]

  def fun(x) do
    super(x)
  end
end

2. &super/n capture does not emit any events

defmodule OverFunCapture1 do
  def fun(x) do
    1
  end

  defoverridable [fun: 1]

  def fun(x) do
    Enum.map([], &super/1)
  end
end

3. &super(&1) call inside capture generates a local_function event

defmodule OverFunCapture2 do
  def fun(x) do
    1
  end

  defoverridable [fun: 1]

  def fun(x) do
    Enum.map([], &super(&1))
  end
end

[iex:12: MyTracer.trace/2]
event #=> {:local_function, [line: 9, column: 19], :"fun (overridable 1)", 1}

4. For defmacro neither of the cases emits any events

Expected behavior

There is a couple of options here

1. super emits consistent local_(function|macro) events in all cases - not ideal as it exposes not documented implementation detail :"fun (overridable 1)"
2. no events emitted at all - not ideal as we emit local calls in other case
3. A new event category super_(function|macro)