泛型限定问题

import java.util.function.Function;


class Scratch {
    static class RoleInfo {
    }

    public static void main(String[] args) {
        // 想让这两个通过
        test(Object::hashCode, RoleInfo::hashCode, new RoleInfo());
        test(Object::toString, RoleInfo::toString, new RoleInfo());
        // 想让这个报错
        test(Object::hashCode, RoleInfo::toString, new RoleInfo());
    }

    public static <T, A, R>
    void test(Function<T, R> a,
              Function<A, R> b,
              T ad) {

    }
}

public final class String implements java.io.Serializable, Comparable<String>, CharSequence {}

public final class Integer extends Number implements Comparable<Integer> {}

import java.util.function.Function;


class Scratch {
    static class RoleInfo {
    }

    public static void main(String[] args) {
        // 想让这两个通过
        test(Object::hashCode, RoleInfo::hashCode, new RoleInfo());
        test(Object::toString, RoleInfo::toString, new RoleInfo());
        // 想让这个报错
        test(Object::hashCode, RoleInfo::toString, new RoleInfo());
    }

    public static <T, A, R extends Comparable<R>>
    void test(Function<T, R> a,
              Function<A, R> b,
              T ad) {

    }
}