class C { constructor(x: number, y: number) { } }
class ELoc extends C {
    constructor(x: number) {
        super(0, x);
    }
}
class ELocVar extends C {  
    constructor(x: number) {
        super(0, loc);
    }

    m() {
        var loc=10;
    }
}

class D extends C { constructor(public z: number) { super(this.z) }  } // too few params
class E extends C { constructor(public z: number) { super(0, this.z) } }
class F extends C { constructor(public z: number) { super("hello", this.z) } } // first param type

function f() {
    if (x<10) {
      x=11;
    }
    else {
        x=12;
    }
}