anchor.diff:    ;
   
   small_stmt
  -  : (expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | assert_stmt)
  +  : (expr_stmt | print_stmt | stub_stmt | pass_stmt | flow_stmt | import_stmt | assert_stmt)
     ;
   
   expr_stmt
  
positive.code:   ;
  
  assert_stmt
    : ASSERT test (',' test)?
    ;
  
  del_stmt
    : DEL exprlist
    ;
  
  pass_stmt
  
negative.code: OR: 'or';
  NOT: 'not';
  ASSERT: 'assert';
  STUB: 'stub';
  CONTINUE: 'continue';
  THROW: 'throw';
  FUNC: 'func';
  PASS: 'pass';