Record literal list type arguments and report errors when there are too many.

dart/tests/language/list_literal_syntax_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+interface I {}
+
+void main() {
+  var list;
+  list = <int
+    I /// 00: compile-time error
+    , int /// 01: compile-time error
+    >[0];
+  Expect.equals(1, list.length);
+
+  list = <int
+    , int /// 02: compile-time error
+    , int /// 02: continued
+    >[0];
+  Expect.equals(1, list.length);
+
+  list = <int
+    , int /// 03: compile-time error
+    , int /// 03: continued
+    , int /// 03: continued
+    >[0];
+  Expect.equals(1, list.length);
+
+  list =
+    <> /// 04: compile-time error
+    [0];
+  Expect.equals(1, list.length);
+
+  list =
+    <<>> /// 05: compile-time error
+    [0];
+  Expect.equals(1, list.length);
+
+  list =
+    <<<>>> /// 06: compile-time error
+    [0];
+  Expect.equals(1, list.length);
+
+  list =
+    <[]> /// 07: compile-time error
+    [0];
+  Expect.equals(1, list.length);
+
+  list = <int>[<int>[<int>[1][0]][0]];
+  Expect.equals(1, list.length);
+  Expect.equals(1, list[0]);
+
+  list = <int>[<List<int>>[[1]][0][0]];
+  Expect.equals(1, list.length);
+  Expect.equals(1, list[0]);
+}