code: def test_get_valid_actions_with_placeholder_type(self):
      type_r = NamedBasicType("R")
      type_d = NamedBasicType("D")
      type_e = NamedBasicType("E")
      name_mapping = {"sample_function": "F"}
      # <#1,#1>
      type_signatures = {"F": UnaryOpType()}
      basic_types = set([type_r, type_d, type_e])
      valid_actions = types.get_valid_actions(
          name_mapping, type_signatures, basic_types
      )
      assert len(valid_actions) == 5
      assert valid_actions["<#1,#1>"] == ["<#1,#1> -> sample_function"]
      assert valid_actions["e"] == ["e -> [<#1,#1>, e]"]
      assert valid_actions["r"] == ["r -> [<#1,#1>, r]"]
      assert valid_actions["d"] == ["d -> [<#1,#1>, d]"]
      assert valid_actions["@start@"] == [
          "@start@ -> d",
          "@start@ -> e",
          "@start@ -> r",
      ]
  
file_path: magnitude/pymagnitude/third_party/allennlp/tests/semparse/type_declarations/type_declaration_test.py
imports: from __future__ import absolute_import
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.semparse.type_declarations import type_declaration
  from allennlp.semparse.type_declarations.type_declaration import ANY_TYPE, BinaryOpType, ComplexType, NamedBasicType, UnaryOpType
  from allennlp.semparse.type_declarations import wikitables_type_declaration
  from allennlp.semparse.type_declarations.wikitables_type_declaration import CELL_TYPE, ROW_TYPE
label_desc: Use image node_id 5 for calling the TestTypeDeclaration obj's underlying member method code with example usage: obj.test_get_valid_actions_with_placeholder_type() without return types