Function explicit_qualified_callable_value 

pub fn explicit_qualified_callable_value(
    node: Node<'_>,
) -> Option<ExplicitQualifiedCallableValue<'_>>

Recognize an explicit address-of qualified callable value such as &Owner::method or &namespace::Owner::method.

The returned nodes come exclusively from the C++ grammar’s named fields. In particular, a nested namespace/type owner remains a structured subtree rather than being reconstructed from source text.