#fixed code
                              @Test
  public void while_statement() {
    setRootRule(PythonGrammar.WHILE_STMT);
    WhileStatementImpl tree = parse("while foo:\n  pass\nelse:\n  pass", treeMaker::whileStatement);
    FirstLastTokenVerifierVisitor visitor = spy(FirstLastTokenVerifierVisitor.class);
    visitor.visitWhileStatement(tree);
    verify(visitor).visitPassStatement((PassStatement) tree.body().statements().get(0));
    verify(visitor).visitPassStatement((PassStatement) tree.elseClause().body().statements().get(0));
  }
#vulnerable code 
                              @Test
  public void while_statement() {
    setRootRule(PythonGrammar.WHILE_STMT);
    WhileStatementImpl tree = parse("while foo:\n  pass\nelse:\n  pass", treeMaker::whileStatement);
    FirstLastTokenVerifierVisitor visitor = spy(FirstLastTokenVerifierVisitor.class);
    visitor.visitWhileStatement(tree);
    verify(visitor).visitPassStatement((PassStatement) tree.body().statements().get(0));
    verify(visitor).visitPassStatement((PassStatement) tree.elseBody().statements().get(0));
  } 
                            #location 8 
                            #vulnerability type NULL_DEREFERENCE