function drawText(x: number, y: number, ...strings: string[]) {
    // draw text
}
drawText(10, 20, "hello");
drawText(10, 20, "hello", "world");
var a = ["one", "two"];
drawText(10, 20, ...a);
drawText(10, 20, "zero", ...a, "three");

var pos = [10, 20];
drawText(...pos, "hello", "world");  // Error
(<any>drawText)(...pos, "hello", "world");  // But ok in untyped call

interface Context {
    drawText(x: number, y: number, ...strings: string[]);
}
declare function getContext(): Context;
var text = ["hello", "world"];
getContext().drawText(10, 20, ...text);