anchor.diff:      }
       write('\n');
       state = SPACE;
  +    column = 0;
     }
   
     void writeFunction(FunctionNode function,
  
positive.code:   }
  
    visitBlockExpression(BlockExpression node) {
      writeWord('do:');
      writeNode(node.body);
      writeWord('done:');
      writeExpression(node.value);
    }
  
    defaultExpression(Expression node) {
  
negative.code: 
    void write(String string) {
      sink.write(string);
      column += string.length;
    }
  
    void writeSpace([String string = ' ']) {
  