Add support for completion of case labels.

pkg/analysis_server/lib/src/services/completion/local_declaration_visitor.dart

 // Copyright (c) 2014, 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.
 
 library services.completion.computer.dart.local.Declaration.visitor;
 
 import 'package:analysis_server/src/services/completion/suggestion_builder.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 
@@ skipping 16 matching lines @@
   void declaredClass(ClassDeclaration declaration);
 
   void declaredClassTypeAlias(ClassTypeAlias declaration);
 
   void declaredField(FieldDeclaration fieldDecl, VariableDeclaration varDecl);
 
   void declaredFunction(FunctionDeclaration declaration);
 
   void declaredFunctionTypeAlias(FunctionTypeAlias declaration);
 
-  void declaredLabel(Label label);
+  void declaredLabel(Label label, bool isCaseLabel);
 
   void declaredLocalVar(SimpleIdentifier name, TypeName type);
 
   void declaredMethod(MethodDeclaration declaration);
 
   void declaredParam(SimpleIdentifier name, TypeName type);
 
   void declaredTopLevelVar(VariableDeclarationList varList,
       VariableDeclaration varDecl);
 
@@ skipping 126 matching lines @@
     _visitParamList(node.parameters);
     return visitNode(node);
   }
 
   @override
   bool visitInterpolationExpression(InterpolationExpression node) {
     return visitNode(node);
   }
 
   @override
+  bool visitSwitchStatement(SwitchStatement node) {
+    for (SwitchMember member in node.members) {
+      for (Label label in member.labels) {
+        declaredLabel(label, true);
+      }
+    }
+    return visitNode(node);
+  }
+
+  @override
   bool visitLabeledStatement(LabeledStatement node) {
-    node.labels.forEach(declaredLabel);
+    for (Label label in node.labels) {
+      declaredLabel(label, false);
+    }
     return visitNode(node);
   }
 
   @override
   bool visitMethodDeclaration(MethodDeclaration node) {
     _visitParamList(node.parameters);
     return visitNode(node);
   }
 
   @override
@@ skipping 37 matching lines @@
           type = normalParam.returnType;
         } else if (normalParam is SimpleFormalParameter) {
           type = normalParam.type;
         }
         SimpleIdentifier name = param.identifier;
         declaredParam(name, type);
       });
     }
   }
 }