class_docstr: Buffers with dimensions of extent 1 can be transformed
  
  Regression test for a previous bug, in which the removal of
  trivial variables resulted in an error in `IndexMap::Inverse`.
code: def before(
      A: T.Buffer((16, 1), "float32"),
  ) -> None:
      T.func_attr({"layout_free_buffers": [0]})
      for i, j in T.grid(16, 1):
          with T.block("block"):
              vi, vj = T.axis.remap("SS", [i, j])
              T.evaluate(A[vi, vj])
  
imports: import tvm
  import tvm.testing
  from tvm import meta_schedule
  from tvm.script import tir
  from tvm.target import Target
  from tvm.tir.schedule.testing import assert_structural_equal_ignore_global_symbol
label_desc: Use image node_id 1 for calling the TestExtentOne obj's underlying member method code with example usage: obj.before(A) without return types