code: def testConcatNoScalars(self):
      scalar = constant_op.constant(7)
      dim = array_ops.placeholder(dtypes.int32)
      with self.assertRaisesRegex(
          ValueError,
          r"Can't concatenate scalars \(use tf\.stack instead\)",
      ):
          array_ops.concat([scalar, scalar, scalar], dim)
  
imports: import numpy
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_array_ops
  from tensorflow.python.ops import gradient_checker
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 30 for calling the ConcatOpTest obj's underlying member method code with example usage: obj.testConcatNoScalars() without return types