Fix warnings_checker.dart handling of multitests

tests/language/if_null_behavior_test.dart

Index: tests/language/if_null_behavior_test.dart
diff --git a/tests/language/if_null_behavior_test.dart b/tests/language/if_null_behavior_test.dart
index c023d891433f9a0aafa95a549eea5c2c932e7229..6ad6d5271cb13fa8a7618dbdb624aa23d38b5e3a 100644
--- a/tests/language/if_null_behavior_test.dart
+++ b/tests/language/if_null_behavior_test.dart
@@ -34,20 +34,20 @@ main() {
   // status files easier to maintain.
   var _ = null ?? null;
 
-  Expect.equals(1, 1 ?? 2); /// 01: ok
-  Expect.equals(1, 1 ?? null); /// 02: ok
-  Expect.equals(2, null ?? 2); /// 03: ok
-  Expect.equals(null, null ?? null); /// 04: ok
-  Expect.equals('B', (new B('B') ?? new C('C')).a); /// 05: ok
-  Expect.equals('B', (new B('B') ?? new C('C')).b); /// 06: static type warning
-  Expect.throws(() => (new B('B') ?? new C('C')).c, noMethod); /// 07: static type warning
-  Expect.equals('B', (new B('B') ?? nullC()).a); /// 08: ok
-  Expect.equals('B', (new B('B') ?? nullC()).b); /// 09: static type warning
-  Expect.throws(() => (new B('B') ?? nullC()).c, noMethod); /// 10: static type warning
-  Expect.equals('C', (nullB() ?? new C('C')).a); /// 11: ok
-  Expect.throws(() => (nullB() ?? new C('C')).b, noMethod); /// 12: static type warning
-  Expect.equals('C', (nullB() ?? new C('C')).c); /// 13: static type warning
-  Expect.throws(() => (nullB() ?? nullC()).a, noMethod); /// 14: ok
-  Expect.throws(() => (nullB() ?? nullC()).b, noMethod); /// 15: static type warning
-  Expect.throws(() => (nullB() ?? nullC()).c, noMethod); /// 16: static type warning
+  Expect.equals(1, 1 ?? 2); //# 01: ok
+  Expect.equals(1, 1 ?? null); //# 02: ok
+  Expect.equals(2, null ?? 2); //# 03: ok
+  Expect.equals(null, null ?? null); //# 04: ok
+  Expect.equals('B', (new B('B') ?? new C('C')).a); //# 05: ok
+  Expect.equals('B', (new B('B') ?? new C('C')).b); //# 06: static type warning
+  Expect.throws(() => (new B('B') ?? new C('C')).c, noMethod); //# 07: static type warning
+  Expect.equals('B', (new B('B') ?? nullC()).a); //# 08: ok
+  Expect.equals('B', (new B('B') ?? nullC()).b); //# 09: static type warning
+  Expect.throws(() => (new B('B') ?? nullC()).c, noMethod); //# 10: static type warning
+  Expect.equals('C', (nullB() ?? new C('C')).a); //# 11: ok
+  Expect.throws(() => (nullB() ?? new C('C')).b, noMethod); //# 12: static type warning
+  Expect.equals('C', (nullB() ?? new C('C')).c); //# 13: static type warning
+  Expect.throws(() => (nullB() ?? nullC()).a, noMethod); //# 14: ok
+  Expect.throws(() => (nullB() ?? nullC()).b, noMethod); //# 15: static type warning
+  Expect.throws(() => (nullB() ?? nullC()).c, noMethod); //# 16: static type warning
 }