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role A[%types?] {
    %types{ ::?CLASS.prefix } := ::?CLASS if ::?CLASS.^find_method("prefix", :local);
    method prefix {...};
    method WHICH {"bbb"};
    method dump-types { dd %types }
    
}

class B does A {
    method prefix {"aaa"}
}

class C does A {
    method prefix {"ccc"}
}

B.dump-types;
C.dump-types;