`@on_load` and `@on_definition` callbacks do not emit trace events

[lukaszsamson]

Elixir and Erlang/OTP versions

Erlang/OTP 27 [erts-15.2.5] [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

With an example tracer

defmodule MyTracer do
  def trace(event, env) do
    dbg({env.file, env.line})
    dbg(event)
    :ok
  end
end
Code.put_compiler_option(:tracers, [MyTracer])

compile example code from https://hexdocs.pm/elixir/1.18.3/Module.html#module-on_definition and https://hexdocs.pm/elixir/1.18.3/Module.html#module-on_load

No traces for the functions given in @on_load and @on_definition attributes are emitted.

Expected behavior

I would expect @on_load to emit :local_function (or :remote_function) and @on_definition to emit :remote_function events. @before_compile, @after_compile and @after_verify correctly emit :remote_(function|macro)

[josevalim]

Thank you!