Module.make_overridable
You're seeing just the function
make_overridable, go back to Module module for more information.
Specs
Makes the given functions in module overridable.
An overridable function is lazily defined, allowing a
developer to customize it. See Kernel.defoverridable/1 for
more information and documentation.
Once a function or a macro is marked as overridable, it will
no longer be listed under definitions_in/1 or return true
when given to defines?/2 until another implementation is
given.