How to check for a valid guard expression in Elixir?

Question

I would like to write a macro to check if an Elixir expression is a valid guard : defmacro valid_guard?(expr)

However I could not find anything in the documentation looking for elements to write this piece of code.

I feel like this function should be part of Elixir also but maybe there is a way to plug it in from erlang ?

Answer 1

One might look into elixir’s source code for defguard/1 in the first place.

One might technically copy-paste the code calling :elixir_utils.extract_guards/1 and check for the outcome instead of doing real work, but I am not sure why this would be ever needed.