docstr: Reject assignment of list to variable type.
docstr_tok: ["Reject","assignment","of","list","to","variable","type","."]
code: def testParseValuesWithBadIndexAssigment1_IgnoreUnknown(self):
      """Reject assignment of list to variable type."""
      with self.assertRaisesRegexp(
          ValueError, r"Assignment of a list to a list index."
      ):
          hparam.parse_values(
              "arr[1]=[1,2,3],c=8", {"arr": int}, ignore_unknown=True
          )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.utils import hparam
  import tensorflow.compat.v1
label_desc: Use image node_id 21 for calling the HParamsTest obj's underlying member method code with example usage: obj.testParseValuesWithBadIndexAssigment1_IgnoreUnknown() without return types