Implement search for local elements.

pkg/analyzer/lib/src/summary/index_unit.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
@@ skipping 499 matching lines @@
     bool isQualified = _isQualified(node);
     if (isQualified && element == null) {
       recordNameRelation(node, IndexRelationKind.IS_REFERENCED_BY);
     }
     // this.field parameter
     if (element is FieldFormalParameterElement) {
       recordRelation(
           element.field, IndexRelationKind.IS_REFERENCED_BY, node, true);
       return;
     }
+    // ignore a local reference to a parameter
+    if (element is ParameterElement && node.parent is! Label) {
+      return;
+    }
     // record specific relations
     recordRelation(
         element, IndexRelationKind.IS_REFERENCED_BY, node, isQualified);
   }
 
   @override
   visitSuperConstructorInvocation(SuperConstructorInvocation node) {
     ConstructorElement element = node.staticElement;
     if (node.constructorName != null) {
       int offset = node.period.offset;
@@ skipping 137 matching lines @@
         usedNames: nameRelations.map((r) => r.nameId).toList(),
         usedNameKinds: nameRelations.map((r) => r.kind).toList(),
         usedNameOffsets: nameRelations.map((r) => r.offset).toList());
   }
 
   void defineName(String name, IndexNameKind kind, int offset) {
     int nameId = pkg._getStringId(name);
     definedNames.add(new _DefinedNameInfo(nameId, kind, offset));
   }
 }