Fix warnings_checker.dart handling of multitests

tests/language/compile_time_constant_arguments_test.dart

Index: tests/language/compile_time_constant_arguments_test.dart
diff --git a/tests/language/compile_time_constant_arguments_test.dart b/tests/language/compile_time_constant_arguments_test.dart
index 7a8c8a28dc96ea2b62912c74e28540836bacf6f1..891457c9effca62b4359b8365ed36b927b5dc865 100644
--- a/tests/language/compile_time_constant_arguments_test.dart
+++ b/tests/language/compile_time_constant_arguments_test.dart
@@ -10,13 +10,13 @@ class A {
 
 main() {
   const A(1);
-  const A(); /// 01: compile-time error, static type warning
-  const A(1, 2); /// 02: compile-time error, static type warning
+  const A(); //# 01: compile-time error, static type warning
+  const A(1, 2); //# 02: compile-time error, static type warning
   const A.named();
-  const A.named(b: 1); /// 03: compile-time error, static type warning
-  const A.named(a: 1, a: 2); /// 04: compile-time error, static type warning
-  const A.named(a: 1, b: 2); /// 05: compile-time error, static type warning
+  const A.named(b: 1); //# 03: compile-time error, static type warning
+  const A.named(a: 1, a: 2); //# 04: compile-time error, static type warning
+  const A.named(a: 1, b: 2); //# 05: compile-time error, static type warning
   const A.optional();
   const A.optional(42);
-  const A.optional(42, 54); /// 06: compile-time error, static type warning
+  const A.optional(42, 54); //# 06: compile-time error, static type warning
 }