Fix warnings_checker.dart handling of multitests

tests/language/map_literal3_test.dart

Index: tests/language/map_literal3_test.dart
diff --git a/tests/language/map_literal3_test.dart b/tests/language/map_literal3_test.dart
index 3a11f76789cbdfbf8cf686421f36520dd5f260b7..f2f02a258600015cbbdad03e9c9c76343b4615d6 100644
--- a/tests/language/map_literal3_test.dart
+++ b/tests/language/map_literal3_test.dart
@@ -63,17 +63,17 @@ class MapLiteralTest {
     Expect.equals(14, m.length);
 
     // Check that last value of duplicate key wins for const maps.
-    final cmap = const <String, num>{"a": 10, "b": 100, "a": 1000}; /// static type warning
+    final cmap = const <String, num>{"a": 10, "b": 100, "a": 1000}; //# static type warning
     Expect.equals(2, cmap.length);
     Expect.equals(1000, cmap["a"]);
     Expect.equals(100, cmap["b"]);
 
-    final cmap2 = const <String, num>{"a": 10, "a": 100, "a": 1000}; /// static type warning
+    final cmap2 = const <String, num>{"a": 10, "a": 100, "a": 1000}; //# static type warning
     Expect.equals(1, cmap2.length);
     Expect.equals(1000, cmap["a"]);
 
     // Check that last value of duplicate key wins for mutable maps.
-    var mmap = <String, num>{"a": 10, "b": 100, "a": 1000}; /// static type warning
+    var mmap = <String, num>{"a": 10, "b": 100, "a": 1000}; //# static type warning
 
     Expect.equals(2, mmap.length);
     Expect.equals(1000, mmap["a"]);
@@ -83,7 +83,7 @@ class MapLiteralTest {
     // are still evaluated, including side effects.
     int counter = 0;
     int ctr() { counter += 10; return counter; }
-    mmap = <String, num>{"a": ctr(), "b": ctr(), "a": ctr()}; /// static type warning
+    mmap = <String, num>{"a": ctr(), "b": ctr(), "a": ctr()}; //# static type warning
     Expect.equals(2, mmap.length);
     Expect.equals(40, ctr());
     Expect.equals(30, mmap["a"]);