Use local variable/function index in its enclosing executable as a part of the identifier.

pkg/analyzer/lib/src/context/cache.dart

Index: pkg/analyzer/lib/src/context/cache.dart
diff --git a/pkg/analyzer/lib/src/context/cache.dart b/pkg/analyzer/lib/src/context/cache.dart
index 8e9ca2bd3d3d668b77ce673efad3413c744da90c..38d7d1c372bd18959f309585693d6eb65b8dff48 100644
--- a/pkg/analyzer/lib/src/context/cache.dart
+++ b/pkg/analyzer/lib/src/context/cache.dart
@@ -346,9 +346,7 @@ class CacheEntry {
   Map<ResultDescriptor, ResultData> _resultMap =
       new HashMap<ResultDescriptor, ResultData>();
 
-  CacheEntry(this.target) {
-    _markAsCacheKey(target);
-  }
+  CacheEntry(this.target);
 
   /**
    * The exception that caused one or more values to have a state of
@@ -397,10 +395,6 @@ class CacheEntry {
       }
     });
     _resultMap.clear();
-    AnalysisTarget oldTarget = target;
-    if (oldTarget is ElementImpl) {
-      oldTarget.setModifier(Modifier.CACHE_KEY, false);
-    }
   }
 
   /**
@@ -755,15 +749,6 @@ class CacheEntry {
   }
 
   /**
-   * If the given `target` is an element, mark it as being a cache key.
-   */
-  void _markAsCacheKey(AnalysisTarget target) {
-    if (target is ElementImpl) {
-      target.setModifier(Modifier.CACHE_KEY, true);
-    }
-  }
-
-  /**
    * Set the [dependedOn] on which this result depends.
    */
   void _setDependedOnResults(ResultData thisData, TargetedResult thisResult,