code: def t_RESERVED(t):
      r"[a-zA-Z]+"
      try:
          t.type = reserved_map[t.value.lower()]
      except KeyError as e:
          raise LexError(
              f"unexpected '{t.value}' at position {t.lexpos}"
          ) from e
      else:
          return t
  
imports: import re
  import sys
  from guild import _lex
label_desc: Use image node_id 14 for calling a global function with example usage: t_RESERVED(t) and returns: t