Added tools/status_clean.dart script

dart/tools/testing/dart/multitest.dart

Index: dart/tools/testing/dart/multitest.dart
diff --git a/dart/tools/testing/dart/multitest.dart b/dart/tools/testing/dart/multitest.dart
index 5541564062142ed1193366bb11516119dedd0c98..3c9c535dfd73e39f72b115ae8240f4d83c9c600b 100644
--- a/dart/tools/testing/dart/multitest.dart
+++ b/dart/tools/testing/dart/multitest.dart
@@ -100,12 +100,12 @@ void ExtractTestsFromMultitest(Path filePath,
         continue;
       } else {
         for (String nextOutcome in annotation.outcomesList) {
-          outcomes[annotation.key].add(nextOutcome);
-          if (!validMultitestOutcomes.contains(nextOutcome)) {
-            print(
-                "Invalid test directive '$nextOutcome' on line ${lineCount}:\n"
-                "${annotation.rest} ");
-            exit(1);
+          if (validMultitestOutcomes.contains(nextOutcome)) {
+            outcomes[annotation.key].add(nextOutcome);
+          } else {
+            DebugLogger.warning(
+                "Warning: Invalid test directive '$nextOutcome' on line "
+                "${lineCount}:\n${annotation.rest} ");
           }
         }
       }
@@ -115,14 +115,21 @@ void ExtractTestsFromMultitest(Path filePath,
     }
   }
 
+  var keysToDelete = [];
   // Check that every key (other than the none case) has at least one outcome
   for (var outcomeKey in outcomes.keys) {
     if (outcomeKey != 'none' && outcomes[outcomeKey].isEmpty) {
-      print("Test ${outcomeKey} has no valid annotated outcomes.\n"
-            "Expected one of: ${validMultitestOutcomes.toString()}");
-      exit(1);
+      DebugLogger.warning(
+          "Warning: Test ${outcomeKey} has no valid annotated outcomes.\n"
+          "Expected one of: ${validMultitestOutcomes.toString()}");
+      // If this multitest doesn't have an outcome, mark the multitest for
+      // deletion.
+      keysToDelete.add(outcomeKey);
     }
   }
+  // If a key/multitest was marked for deletion, do the necessary cleanup.
+  keysToDelete.forEach((key) => outcomes.remove(key));
+  keysToDelete.forEach((key) => testsAsLines.remove(key));
 
   // Add the template, with no multitest lines, as a test with key 'none'.
   testsAsLines['none'] = testTemplate;
@@ -141,11 +148,22 @@ class _Annotation {
   List<String> outcomesList;
   _Annotation() {}
   factory _Annotation.from(String line) {
+    // Do an early return with "null" if this is not a valid multitest
+    // annotation.
     if (!line.contains('///')) {
       return null;
     }
+    var parts = line
+        .split('///')[1]
+        .split(':')
+        .map((s) => s.trim())
+        .where((s) => s.length > 0)
+        .toList();
+    if (parts.length <= 1) {
+      return null;
+    }
+
     var annotation = new _Annotation();
-    var parts = line.split('///')[1].split(':').map((s) => s.trim()).toList();
     annotation.key = parts[0];
     annotation.rest = parts[1];
     annotation.outcomesList = annotation.rest.split(',')