Checking @nogc-ness of an Allocator.allocate()

[Nordlöw]

How do I check whether an aggregate member function (call for a 
specific argument) is @nogc or not?

I want to check whether

     Allocator.allocate(1)

(for a any Allocator) is @nogc or not?

Is

https://dlang.org/phobos/std_traits.html#hasFunctionAttributes

the way to do it?