code: def p_last_unit(p):
      "last_unit : LAST delta_unit"
      delta = _unit_delta(1, p[2])
      p[0] = lambda ref: (ref - delta, None)
  
imports: from datetime import datetime, date, time, timedelta
  from guild import _yacc
  from .None import trlex
label_desc: Use image node_id 42 for calling a global function with example usage: p_last_unit(p) without return types