Fix for parsing default parameters.

pkg/analyzer/test/generated/parser_test.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 analyzer.test.generated.parser_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 6816 matching lines @@
     expect(simpleParameter.covariantKeyword, isNull);
     expect(simpleParameter.identifier, isNotNull);
     expect(simpleParameter.keyword, isNull);
     expect(simpleParameter.type, isNotNull);
     expect(simpleParameter.kind, kind);
     expect(defaultParameter.separator, isNotNull);
     expect(defaultParameter.defaultValue, isNotNull);
     expect(defaultParameter.kind, kind);
   }
 
+  void test_parseFormalParameter_type_named_noDefault() {
+    ParameterKind kind = ParameterKind.NAMED;
+    FormalParameter parameter = parseFormalParameter('A a', kind);
+    expect(parameter, isNotNull);
+    assertNoErrors();
+    expect(parameter, new isInstanceOf<DefaultFormalParameter>());
+    DefaultFormalParameter defaultParameter = parameter;
+    SimpleFormalParameter simpleParameter =
+        defaultParameter.parameter as SimpleFormalParameter;
+    expect(simpleParameter.covariantKeyword, isNull);
+    expect(simpleParameter.identifier, isNotNull);
+    expect(simpleParameter.keyword, isNull);
+    expect(simpleParameter.type, isNotNull);
+    expect(simpleParameter.kind, kind);
+    expect(defaultParameter.separator, isNull);
+    expect(defaultParameter.defaultValue, isNull);
+    expect(defaultParameter.kind, kind);
+  }
+
   void test_parseFormalParameter_type_normal() {
     ParameterKind kind = ParameterKind.REQUIRED;
     FormalParameter parameter = parseFormalParameter('A a', kind);
     expect(parameter, isNotNull);
     assertNoErrors();
     expect(parameter, new isInstanceOf<SimpleFormalParameter>());
     SimpleFormalParameter simpleParameter = parameter;
     expect(simpleParameter.covariantKeyword, isNull);
     expect(simpleParameter.identifier, isNotNull);
     expect(simpleParameter.keyword, isNull);
@@ skipping 13 matching lines @@
     expect(simpleParameter.covariantKeyword, isNull);
     expect(simpleParameter.identifier, isNotNull);
     expect(simpleParameter.keyword, isNull);
     expect(simpleParameter.type, isNotNull);
     expect(simpleParameter.kind, kind);
     expect(defaultParameter.separator, isNotNull);
     expect(defaultParameter.defaultValue, isNotNull);
     expect(defaultParameter.kind, kind);
   }
 
+  void test_parseFormalParameter_type_positional_noDefault() {
+    ParameterKind kind = ParameterKind.POSITIONAL;
+    FormalParameter parameter = parseFormalParameter('A a', kind);
+    expect(parameter, isNotNull);
+    assertNoErrors();
+    expect(parameter, new isInstanceOf<DefaultFormalParameter>());
+    DefaultFormalParameter defaultParameter = parameter;
+    SimpleFormalParameter simpleParameter =
+        defaultParameter.parameter as SimpleFormalParameter;
+    expect(simpleParameter.covariantKeyword, isNull);
+    expect(simpleParameter.identifier, isNotNull);
+    expect(simpleParameter.keyword, isNull);
+    expect(simpleParameter.type, isNotNull);
+    expect(simpleParameter.kind, kind);
+    expect(defaultParameter.separator, isNull);
+    expect(defaultParameter.defaultValue, isNull);
+    expect(defaultParameter.kind, kind);
+  }
+
   void test_parseFormalParameter_var_named() {
     ParameterKind kind = ParameterKind.NAMED;
     FormalParameter parameter = parseFormalParameter('var a : null', kind);
     expect(parameter, isNotNull);
     assertNoErrors();
     expect(parameter, new isInstanceOf<DefaultFormalParameter>());
     DefaultFormalParameter defaultParameter = parameter;
     SimpleFormalParameter simpleParameter =
         defaultParameter.parameter as SimpleFormalParameter;
     expect(simpleParameter.covariantKeyword, isNull);
@@ skipping 7694 matching lines @@
     expect(typeAlias.name, isNotNull);
     expect(typeAlias.typeParameters, isNull);
     expect(typeAlias.semicolon, isNotNull);
     GenericFunctionType functionType = typeAlias.functionType;
     expect(functionType, isNotNull);
     expect(functionType.parameters, isNotNull);
     expect(functionType.returnType, isNotNull);
     expect(functionType.typeParameters, isNull);
   }
 }