==== tests/cases/compiler/classSideInheritance3.ts (2 errors) ====
    class A {
        constructor(public x: string) {
        }
    }
    class B extends A {
        constructor(x: string, public data: string) {
            super(x);
        }
    }
    class C extends A {
        constructor(x: string) {
            super(x);
        }
    }
    
    var r1: typeof A = B; // error
        ~~
!!! Type 'typeof B' is not assignable to type 'typeof A'.
    var r2: new (x: string) => A = B; // error
        ~~
!!! Type 'typeof B' is not assignable to type 'new (x: string) => A'.
    var r3: typeof A = C; // ok