Description Knut Wannheden 2011-05-14 15:13:15 EDT

The following Xtend2 snippet:

	def foo() {
		var x = <?> newArrayList('foo', 'bar')
		x = newArrayList(42)
	}

compiles to:

  public ArrayList<?> foo() {
    ArrayList<?> _xblockexpression = null;
    {
      ArrayList<?> _newArrayList = CollectionLiterals.<?>newArrayList("foo", "bar"); // COMPILE ERROR
      ArrayList<?> x = _newArrayList;
      ArrayList<Integer> _newArrayList_1 = CollectionLiterals.<Integer>newArrayList(((Integer)42));
      ArrayList<?> _x = x = _newArrayList_1;
      _xblockexpression = (_x);
    }
    return _xblockexpression;
  }

This results in the Java compile error "Wildcard is not allowed at this location".

The same is true for a "more sensible" use case:

	def foo() {
		var x = <? extends CharSequence> newArrayList('foo', 'bar')
		x = newArrayList(new StringBuilder('baz'))
	}

which compiles to:

  public ArrayList<? extends CharSequence> foo() {
    ArrayList<? extends CharSequence> _xblockexpression = null;
    {
      ArrayList<? extends CharSequence> _newArrayList = CollectionLiterals.<? extends CharSequence>newArrayList("foo", "bar");
      ArrayList<? extends CharSequence> x = _newArrayList;
      StringBuilder _stringBuilder = new StringBuilder("baz");
      ArrayList<StringBuilder> _newArrayList_1 = CollectionLiterals.<StringBuilder>newArrayList(_stringBuilder);
      ArrayList<? extends CharSequence> _x = x = _newArrayList_1;
      _xblockexpression = (_x);
    }
    return _xblockexpression;
  }