class_docstr: Buffers must occur within a Block
code: def before(
      A: T.Buffer((16, 16), "float32"),
  ) -> None:
      T.func_attr({"layout_free_buffers": [0]})
      for i, j in T.grid(16, 16):
          T.evaluate(A[i, j])
  
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 TestRewrittenBuffersMustOccurWithinBlock obj's underlying member method code with example usage: obj.before(A) without return types