code: def constraint(self):
      if self.preconditions is None:
          return True
      elif isinstance(self.preconditions, tvm.ir.PrimExpr):
          return self.preconditions
      else:
          return tvm.tir.all(*self.preconditions)
  
imports: import inspect
  import pytest
  import tvm
  from tvm import te, tir
  from tvm.tir import truncdiv, truncmod, floordiv, floormod
label_desc: Use image node_id 2 for calling the TestCase obj's underlying member method code with example usage: obj.constraint() and returns: True, self, tvm