blob: fe67f0b479020948a75295ca2d1330e50d269d38 [file] [log] [blame]
// @dart = 2.9
class A {
A operator +(A a) => a;
B operator -() => new B();
B operator [](A a) => new B();
void operator []=(A a1, A a2) {}
}
class B extends A {
A operator +(B b) => b;
A operator -() => this;
B operator [](B b) => b;
void operator []=(B b, A a) {}
}
class C extends A {
A operator [](B b) => b;
void operator []=(A a, B b) {}
}
main() {}