Fix warnings_checker.dart handling of multitests

tests/language/abstract_getter_test.dart

Index: tests/language/abstract_getter_test.dart
diff --git a/tests/language/abstract_getter_test.dart b/tests/language/abstract_getter_test.dart
index 964cf80609a54d2732b66246fe8f0660c44c31d4..32174f2b016d02a98cc5eb7b54eb816b6d16276d 100644
--- a/tests/language/abstract_getter_test.dart
+++ b/tests/language/abstract_getter_test.dart
@@ -8,7 +8,7 @@ import "package:expect/expect.dart";
 
 class Foo {
   // Intentionally abstract:
-  get i; // /// 01: static type warning
+  get i; // //# 01: static type warning
 }
 
 class Bar {
@@ -17,9 +17,9 @@ class Bar {
 noMethod(e) => e is NoSuchMethodError;
 
 checkIt(f) {
-  Expect.throws(() { f.i = 'hi'; }, noMethod); // /// 01: continued
-  Expect.throws(() { print(f.i); }, noMethod); // /// 01: continued
-  Expect.throws(() { print(f.i()); }, noMethod); // /// 01: continued
+  Expect.throws(() { f.i = 'hi'; }, noMethod); // //# 01: continued
+  Expect.throws(() { print(f.i); }, noMethod); // //# 01: continued
+  Expect.throws(() { print(f.i()); }, noMethod); // //# 01: continued
 }
 
 main() {