Hi on this expression when I select KeyedTree new at: 1 put: '1-3-1'; at: 2 put: '1-3-2'; yourself I get an error because the method extracted look like the following. at: 1 put: '1-3-1'; at: 2 put: '1-3-2'; yourself testSubtrees "Test the subtrees method for success and failure modes." | t1 t2 t3 t4 | t1 := KeyedTree new at: 1 put: (t2 := KeyedTree new at: 1 put: '1-1'; at: 2 put: '1-2'; at: 3 put: (t3 := KeyedTree new at: 1 put: '1-3-1'; at: 2 put: '1-3-2'; yourself); yourself); at: 2 put: '2'; at: 3 put: (t4 := KeyedTree new at: 1 put: '1-3-1'; at: 2 put: '1-3-2'; yourself); yourself. I wonder if something change in the AST. --