Problems reported:

parser/error_recovery/issue_45251:3:39: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo1 = Map<String, List<int>>{};
                                      ^^^

parser/error_recovery/issue_45251:9:39: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo3 = Map{};
                                      ^^^

parser/error_recovery/issue_45251:18:39: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo6 = Map<String, List<int>>{"a": null};
                                      ^^^

parser/error_recovery/issue_45251:21:39: A map literal can't be prefixed by 'Map'.
  final Map<String, Undefined> foo7 = Map{"a": null};
                                      ^^^

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