test_inputs/flow/loop-tree.ai

   1 sink: "{ S[] -> a[] }"
   2 must_source: "{ T[i] -> a[] : 0 <= i <= 9 }"
   3 schedule:
   4   domain: "{ T[i]; S[] }"
   5   child:
   6     sequence:
   7     - filter: "{ T[i] }"
   8       child:
   9         schedule: "[{ T[i] -> [(i)] }]"
  10     - filter: "{ S[] }"