code: def expect(self, expr):
          
          if not self.current.test(expr):
              expr = describe_token_expr(expr)
              if self.current.type is TOKEN_EOF:
                  raise TemplateSyntaxError('unexpected end of template, '
                                            'expected %r.' % expr,
                                            self.current.lineno,
                                            self.name, self.filename)
              raise TemplateSyntaxError("expected token %r, got %r" %
                                        (expr, describe_token(self.current)),
                                        self.current.lineno,
                                        self.name, self.filename)
          try:
              return self.current
          finally:
              next(self)
docs: Expect a given token type and return it.  This accepts the same
          argument as :meth:`jinja2.lexer.Token.test`.