code: def errinfo(msmt):
      
  
      if isinstance(msmt, Textual):
          msmt = msmt.unwrap()
  
      if np.isscalar(msmt):
          return 0, msmt, msmt, msmt
  
      if isinstance(msmt, Uval):
          rep, plus1, minus1 = msmt.repvals(uval_default_repval_method)
          return 0, rep, plus1, minus1
  
      if isinstance(msmt, Lval):
          return limtype(msmt), msmt.value, msmt.value, msmt.value
  
      raise ValueError('don\'t know how to treat %r as a measurement' % msmt)
docs: Return (limtype, repval, errval1, errval2). Like m_liminfo, but also
      provides error bar information for values that have it.