Fix warnings_checker.dart handling of multitests

tests/language/number_identifier_test.dart

Index: tests/language/number_identifier_test.dart
diff --git a/tests/language/number_identifier_test.dart b/tests/language/number_identifier_test.dart
index b4178c09d78ae95827d2528a9eb7d32f10403823..1279328d1f7262fb13a711eac44c9f4b0f43c1c5 100644
--- a/tests/language/number_identifier_test.dart
+++ b/tests/language/number_identifier_test.dart
@@ -13,8 +13,8 @@ main() {
   Expect.isTrue(0x10is int);
   Expect.isTrue(-0x10is int);
   // "a" will be part of hex literal, the following "s" is an error.
-  0x10as int; // /// 01: compile-time error
-  0x; //         /// 04: compile-time error
+  0x10as int; // //# 01: compile-time error
+  0x; //         //# 04: compile-time error
 
   // Double literals.
   Expect.isTrue(2.0is double);
@@ -29,16 +29,16 @@ main() {
   Expect.equals(1e-2, 1e-2as double);
   Expect.isTrue(1e+2is double);
   Expect.equals(1e+2, 1e+2as double);
-  Expect.throws(() => 1.e+2, //                      /// 05: ok
-                (e) => e is NoSuchMethodError); //   /// 05: continued
-  1d; // /// 06: compile-time error
-  1D; // /// 07: compile-time error
-  Expect.throws(() => 1.d+2, //                      /// 08: ok
-                (e) => e is NoSuchMethodError); //   /// 08: continued
-  Expect.throws(() => 1.D+2, //                      /// 09: ok
-                (e) => e is NoSuchMethodError); //   /// 09: continued
-  1.1d; // /// 10: compile-time error
-  1.1D; // /// 11: compile-time error
-  1e; // /// 02: compile-time error
-  1x; // /// 03: compile-time error
+  Expect.throws(() => 1.e+2, //                      //# 05: ok
+                (e) => e is NoSuchMethodError); //   //# 05: continued
+  1d; // //# 06: compile-time error
+  1D; // //# 07: compile-time error
+  Expect.throws(() => 1.d+2, //                      //# 08: ok
+                (e) => e is NoSuchMethodError); //   //# 08: continued
+  Expect.throws(() => 1.D+2, //                      //# 09: ok
+                (e) => e is NoSuchMethodError); //   //# 09: continued
+  1.1d; // //# 10: compile-time error
+  1.1D; // //# 11: compile-time error
+  1e; // //# 02: compile-time error
+  1x; // //# 03: compile-time error
 }