text: Title: Unexpected numerical token
  Body: ```xsh
  echo $123
  # Unexpected token: TokenInfo(type=55 (OP), string='$123', start=(1, 7), end=(1, 11), line='![echo $123]\n')
  
  showcmd echo $123
  # ['echo', "Unexpected token: TokenInfo(type=55 (OP), string='$123', start=(1, 15), end=(1, 19), line='![showcmd echo $123]\\n')"]
  
  $(echo $123)
  # "Unexpected token: TokenInfo(type=55 (OP), string='$123', start=(1, 7), end=(1, 11), line='$(echo $123)\\n')"
  ```
  Here instead of returning error as result we need to do the same as:
  ```xsh
  echo $qwe
  # $qwe
  ```
  
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