Function resolve_method 

pub fn resolve_method(
    receiver: &Type,
    method: &str,
    impls: &ImplTable,
) -> Option<ResolvedMethod>

Dispatch a method call on receiver by searching impls.

Search order:

1. The inherent impl registered for receiver’s type key (if any).
2. All trait impls whose target type key matches receiver.

Returns the first match found, or None if no impl provides method.