Dialyzer operates on the beams created from these modules right? Seems better to add the specs for these special functions, rather than disable `warn_missing_spec`. In any case, I gave it a shot by adding `{no_warn_missing_spec, true}` as well as `{warn_missing_spec, false}` [here](https://github.com/elixir-lang/elixir/blob/master/lib/elixir/src/elixir_compiler.erl#L71), but neither one worked.