Fix summarization of trailing `dynamic` type arguments.

pkg/analyzer/lib/src/summary/summarize_ast.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.
 
 library serialization.summarize_ast;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
@@ skipping 494 matching lines @@
         }
       } else if (identifier is PrefixedIdentifier) {
         int prefixIndex = prefixIndices.putIfAbsent(identifier.prefix.name,
             () => serializeReference(null, identifier.prefix.name));
         b.reference =
             serializeReference(prefixIndex, identifier.identifier.name);
       } else {
         throw new StateError(
             'Unexpected identifier type: ${identifier.runtimeType}');
       }
-      if (node.typeArguments != null &&
-          node.typeArguments.arguments.any(isNotDynamic)) {
-        b.typeArguments =
-            node.typeArguments.arguments.map(serializeTypeName).toList();
+      if (node.typeArguments != null) {
+        // Trailing type arguments of type 'dynamic' should be omitted.
+        NodeList<TypeName> args = node.typeArguments.arguments;
+        int numArgsToSerialize = args.length;
+        while (numArgsToSerialize > 0 && isDynamic(args[numArgsToSerialize - 1])) {
+          --numArgsToSerialize;
+        }
+        if (numArgsToSerialize > 0) {
+          List<UnlinkedTypeRefBuilder> serializedArguments = <UnlinkedTypeRefBuilder>[];
+          for (int i = 0; i < numArgsToSerialize; i++) {
+            serializedArguments.add(serializeTypeName(args[i]));
+          }
+          b.typeArguments = serializedArguments;
+        }
       }
     }
     return b;
   }
 
   /**
    * Serialize the given [typeParameters] into a list of [UnlinkedTypeParam]s,
    * and also store them in [typeParameterScope].
    */
   List<UnlinkedTypeParamBuilder> serializeTypeParameters(
@@ skipping 260 matching lines @@
     b.nameOffset = node.name.offset;
     if (node.bound != null) {
       b.bound = serializeTypeName(node.bound);
     }
     return b;
   }
 
   /**
    * Helper method to determine if a given [typeName] refers to `dynamic`.
    */
-  static bool isNotDynamic(TypeName typeName) {
+  static bool isDynamic(TypeName typeName) {
     Identifier name = typeName.name;
-    return !(name is SimpleIdentifier && name.name == 'dynamic');
+    return name is SimpleIdentifier && name.name == 'dynamic';
   }
 }
 
 /**
  * A [_TypeParameterScope] is a [_Scope] which defines [_ScopedTypeParameter]s.
  */
 class _TypeParameterScope extends _Scope {
   /**
    * Get the number of [_ScopedTypeParameter]s defined in this
    * [_TypeParameterScope].
    */
   int get length => _definedNames.length;
 }