Problems reported:

parser/error_recovery/issue_45251_new:3:39: A map literal can't be prefixed by 'new Map'.
  final Map<String, Undefined> foo1 = new Map<String, List<int>>{};
                                      ^^^^^^^

parser/error_recovery/issue_45251_new:6:39: A literal can't be prefixed by 'new'.
  final Map<String, Undefined> foo2 = new <String, List<int>>{};
                                      ^^^

parser/error_recovery/issue_45251_new:9:39: A map literal can't be prefixed by 'new Map'.
  final Map<String, Undefined> foo3 = new Map{};
                                      ^^^^^^^

parser/error_recovery/issue_45251_new:18:39: A map literal can't be prefixed by 'new Map'.
  final Map<String, Undefined> foo6 = new Map<String, List<int>>{"a": null};
                                      ^^^^^^^

parser/error_recovery/issue_45251_new:21:39: A map literal can't be prefixed by 'new Map'.
  final Map<String, Undefined> foo7 = new Map{"a": null};
                                      ^^^^^^^

parser/error_recovery/issue_45251_new:24:39: A literal can't be prefixed by 'new'.
  final Map<String, Undefined> foo8 = new <String, List<int>>{"a": null};
                                      ^^^

parser/error_recovery/issue_45251_new:27:39: A literal can't be prefixed by 'new'.
  final Map<String, Undefined> foo9 = new {"a": null};
                                      ^^^

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