Fix warnings_checker.dart handling of multitests

tests/standalone/io/platform_resolved_executable_test.dart

Index: tests/standalone/io/platform_resolved_executable_test.dart
diff --git a/tests/standalone/io/platform_resolved_executable_test.dart b/tests/standalone/io/platform_resolved_executable_test.dart
index b5ae47c1f3415e1e718b68de1dee9c7a4913b344..9d8b6b458d85b38e89bc7335d668ed6d7a07e09e 100644
--- a/tests/standalone/io/platform_resolved_executable_test.dart
+++ b/tests/standalone/io/platform_resolved_executable_test.dart
@@ -141,17 +141,17 @@ void main() {
   }
 
   testDartExecShouldNotBeInCurrentDir();
-  testShouldSucceedWithSourcePlatformExecutable(); /// 00: ok
+  testShouldSucceedWithSourcePlatformExecutable(); //# 00: ok
   // dart:io does not support linking to files in Windows.
   if (!Platform.isWindows) {
-    withTempDir(testExeSymLinked); /// 01: ok
+    withTempDir(testExeSymLinked); //# 01: ok
   }
-  withTempDir(testExeDirSymLinked); /// 02: ok
-  testPathToSDKDir(); /// 03: ok
-  withTempDir(testPathPointsToSymLinkedSDKPath); /// 04: ok
+  withTempDir(testExeDirSymLinked); //# 02: ok
+  testPathToSDKDir(); //# 03: ok
+  withTempDir(testPathPointsToSymLinkedSDKPath); //# 04: ok
   // dart:io does not support linking to files in Windows.
   if (!Platform.isWindows) {
-    withTempDir(testPathToDirWithExeSymLinked); /// 05: ok
+    withTempDir(testPathToDirWithExeSymLinked); //# 05: ok
   }
-  testShouldFailOutsidePath(); /// 06: ok
+  testShouldFailOutsidePath(); //# 06: ok
 }