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can
Combined from primary sources listed below.

In role Metamodel::MROBasedMethodDispatch§

See primary documentation in context for method can. 

method can($obj, $name)

Returns the list of methods of that name the object can do.

In Metamodel::ClassHOW§

See primary documentation in context for method can. 

method can($obj, $method-name)

Given a method name, it returns a List of methods that are available with this name.

class A      { method x($a) {} };
class B is A { method x()   {} };
say B.^can('x').elems;              # OUTPUT: «2␤»
for B.^can('x') {
    say .arity;                     # OUTPUT: «1, 2␤»
}

In this example, class B has two possible methods available with name x (though a normal method call would only invoke the one installed in B directly). The one in B has arity 1 (i.e. it expects one argument, the invocant (self)), and the one in A expects 2 arguments (self and $a).