Problem not minifying a string that starts with t single line comment

[sammyukavi]

//The code below this commented line does not minify,instead is returned as a semi colon
String.prototype.compose = (function () {
var re = /{{(.+?)}}/g;
return function (o) {
return this.replace(re, function (_, k) {
return typeof o[k] !== 'undefined' ? o[k] : '';
});
};
}());

Actually code breaks if it encounters a single line comment