2321         return x

  2321         return x

  2322 

  2322 

  2323     op = x[0]

  2323     op = x[0]

  2324     if op == 'parent':

  2324     if op == 'parent':

  2325         # x^:y means (x^) : y, not x ^ (:y)

  2325         # x^:y means (x^) : y, not x ^ (:y)

  2326         post = ('parentpost', x[1])

  2327         post = ('parentpost', x[1])

  2327         if x[2][0] == 'dagrangepre':

  2328         if x[2][0] == 'dagrangepre':

  2328             return _fixops(('dagrange', post, x[2][1]))

  2329             return _fixops(('dagrange', post, x[2][1]))

  2329         elif x[2][0] == 'rangepre':

  2330         elif x[2][0] == 'rangepre':

  2330             return _fixops(('range', post, x[2][1]))

  2331             return _fixops(('range', post, x[2][1]))

  2331 

  2334 

  2332     return (op,) + tuple(_fixops(y) for y in x[1:])

  2335     return (op,) + tuple(_fixops(y) for y in x[1:])

  2333 

  2336 

  2334 def _optimize(x, small):

  2337 def _optimize(x, small):

  2335     if x is None:

  2338     if x is None: