string concatenation results invalid javascript if space is omitted

[edokan]

following code

class test
  @test_id: 'menemen'

  menemen: ->
    a = @test_id +''

produces following output

var test;
test = (function() {
  function test() {}
  test.test_id = 'menemen';
  test.prototype.menemen = function() {
    var a;
    return a = this.test_id(+'');
  };
  return test;
})();

if you look at the line return a = this.test_id(+''), you will see the problem. it is caused by missing space between + and ''. if i try @test_id(space)+(space)'' or @test_id+'' it works fine.

[vendethiel]

Most recent dup : #2703. Explanations are in