Problems reported:

parser/error_recovery/issue_45251_const:3:45: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo1 = const Map<String, List<int>>{};
                                            ^^^

parser/error_recovery/issue_45251_const:9:45: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo3 = const Map{};
                                            ^^^

parser/error_recovery/issue_45251_const:18:45: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo6 = const Map<String, List<int>>{"a": null};
                                            ^^^

parser/error_recovery/issue_45251_const:21:45: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo7 = const Map{"a": null};
                                            ^^^

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