code: def test_reorder_block_iter_var():
      sch = tir.Schedule(matmul, debug_mask="all")
      C = sch.get_block("C")
      sch.reorder_block_iter_var(C, [2, 1, 0])
      tvm.ir.assert_structural_equal(
          matmul_after_reorder_block_iter_var.with_attr(
              "global_symbol", "matmul"
          ),
          sch.mod["main"],
      )
      verify_trace_roundtrip(sch=sch, mod=matmul)
  
file_path: tvm/tests/python/tir-schedule/test_tir_schedule_reorder_block_iter_var.py
imports: import pytest
  import tvm
  import tvm.testing
  from tvm import tir
  from tvm.script import tir
  from tvm.tir.schedule.testing import verify_trace_roundtrip
label_desc: Use image node_id 3 for calling a global function with example usage: test_reorder_block_iter_var() without return types