// Generic call with parameter of object type with member of function type of n args passed object whose associated member is call signature with n+1 args

function foo<T, U>(arg: { cb: new(t: T) => U }) {
    return new arg.cb(null);
}

var arg: { cb: new<T>(x: T) => string };
var r = foo(arg); // {}
// more args not allowed
var arg2: { cb: new <T>(x: T, y: T) => string };
var r2 = foo(arg2); // error
var arg3: { cb: new (x: string, y: number) => string };
var r3 = foo(arg3); // error

function foo2<T, U>(arg: { cb: new(t: T, t2: T) => U }) {
    return new arg.cb(null, null);
}

// fewer args ok
var r4 = foo(arg); // {}
var arg4: { cb: new (x: string) => string };
var r6 = foo(arg4); // string
var arg5: { cb: new () => string };
var r7 = foo(arg5); // string
