//// [chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.ts]
class Chain<T extends A> {
    constructor(public value: T) { }
    then<S extends T>(cb: (x: T) => S): Chain<S> {
        return null;
    }
}

class A {
    x;
}
class B extends A {
    y;
}
class C extends B {
    z;
}

// Ok to go down the chain, but error to try to climb back up
(new Chain(new A)).then(a => new B).then(b => new C).then(c => new B).then(b => new A);

//// [chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js]
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    __.prototype = b.prototype;
    d.prototype = new __();
};
var Chain = (function () {
    function Chain(value) {
        this.value = value;
    }
    Chain.prototype.then = function (cb) {
        return null;
    };
    return Chain;
})();
var A = (function () {
    function A() {
    }
    return A;
})();
var B = (function (_super) {
    __extends(B, _super);
    function B() {
        _super.apply(this, arguments);
    }
    return B;
})(A);
var C = (function (_super) {
    __extends(C, _super);
    function C() {
        _super.apply(this, arguments);
    }
    return C;
})(B);
// Ok to go down the chain, but error to try to climb back up
(new Chain(new A)).then(function (a) { return new B; }).then(function (b) { return new C; }).then(function (c) { return new B; }).then(function (b) { return new A; });