Elements. Update ExecutableElementImpl.parameters to return List<ParameterElementImpl>.

Change-Id: I6d54810bc9b7c66bf9573d8e5748f132e57dee63
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/403800
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/dart/element/element.dart

@@ -561,11 +561,11 @@ class ClassElementImpl extends ClassOrMixinElementImpl
       var hasMixinWithInstanceVariables = mixins.any(typeHasInstanceVariables);
       implicitConstructor.isConst =
           superclassConstructor.isConst && !hasMixinWithInstanceVariables;
-      List<ParameterElement> superParameters = superclassConstructor.parameters;
+      var superParameters = superclassConstructor.parameters;
       int count = superParameters.length;
       var argumentsForSuperInvocation = <ExpressionImpl>[];
       if (count > 0) {
-        var implicitParameters = <ParameterElement>[];
+        var implicitParameters = <ParameterElementImpl>[];
         for (int i = 0; i < count; i++) {
           ParameterElement superParameter = superParameters[i];
           ParameterElementImpl implicitParameter;
@@ -3649,7 +3649,7 @@ abstract class ExecutableElementImpl extends _ExistingElementImpl
     implements ExecutableElement, ExecutableFragment {
   /// A list containing all of the parameters defined by this executable
   /// element.
-  List<ParameterElement> _parameters = const [];
+  List<ParameterElementImpl> _parameters = const [];
 
   /// The inferred return type of this executable element.
   DartType? _returnType;
@@ -3772,16 +3772,16 @@ abstract class ExecutableElementImpl extends _ExistingElementImpl
   }
 
   @override
-  List<ParameterElement> get parameters {
+  List<ParameterElementImpl> get parameters {
     linkedData?.read(this);
     return _parameters;
   }
 
   /// Set the parameters defined by this executable element to the given
   /// [parameters].
-  set parameters(List<ParameterElement> parameters) {
-    for (ParameterElement parameter in parameters) {
-      (parameter as ParameterElementImpl).enclosingElement3 = this;
+  set parameters(List<ParameterElementImpl> parameters) {
+    for (var parameter in parameters) {
+      parameter.enclosingElement3 = this;
     }
     _parameters = parameters;
   }
@@ -9844,7 +9844,7 @@ class PropertyAccessorElementImpl_ImplicitSetter
   Element get nonSynthetic => variable2;
 
   @override
-  List<ParameterElement> get parameters {
+  List<ParameterElementImpl> get parameters {
     if (_parameters.isNotEmpty) {
       return _parameters;
     }

pkg/analyzer/lib/src/dart/element/extensions.dart

@@ -203,7 +203,18 @@ extension LibraryExtension2 on LibraryElement2? {
       this?.featureSet.isEnabled(Feature.wildcard_variables) ?? false;
 }
 
-extension ParameterElementExtensions on ParameterElement {
+extension ListOfParameterElementExtension on List<ParameterElement> {
+  /// Returns `this` as `List<ParameterElementImpl>`, converting if it isn't
+  /// one already.
+  List<ParameterElementImpl> toImpl() {
+    return switch (this) {
+      List<ParameterElementImpl> already => already,
+      _ => [for (var p in this) p.toImpl()],
+    };
+  }
+}
+
+extension ParameterElementExtension on ParameterElement {
   /// Return [ParameterElement] with the specified properties replaced.
   ParameterElementImpl copyWith({
     DartType? type,
@@ -220,8 +231,12 @@ extension ParameterElementExtensions on ParameterElement {
 
   /// Returns `this`, converted to a [ParameterElementImpl] if it isn't one
   /// already.
-  ParameterElementImpl toImpl() =>
-      switch (this) { ParameterElementImpl p => p, _ => copyWith() };
+  ParameterElementImpl toImpl() {
+    return switch (this) {
+      ParameterElementImpl p => p,
+      _ => copyWith(),
+    };
+  }
 }
 
 extension RecordTypeExtension on RecordType {

pkg/analyzer/lib/src/dart/element/inheritance_manager3.dart

@@ -1140,7 +1140,7 @@ class InheritanceManager3 {
       result.name2 = fragmentName;
       result.typeParameters = resultType.typeFormals;
       result.returnType = resultType.returnType;
-      result.parameters = resultType.parameters;
+      result.parameters = resultType.parameters.toImpl();
       result.element = MethodElementImpl2(
         Reference.root(), // TODO(scheglov): wrong
         firstMethod.name,
@@ -1158,7 +1158,7 @@ class InheritanceManager3 {
       result.isGetter = firstAccessor.isGetter;
       result.isSetter = firstAccessor.isSetter;
       result.returnType = resultType.returnType;
-      result.parameters = resultType.parameters;
+      result.parameters = resultType.parameters.toImpl();
 
       var field = FieldElementImpl(variableName, -1);
       field.enclosingElement3 = targetClass;

pkg/analyzer/lib/src/generated/testing/element_factory.dart

@@ -236,7 +236,7 @@ class ElementFactory {
       ClassElement enclosingElement,
       String methodName,
       DartType returnType,
-      List<ParameterElement> parameters) {
+      List<ParameterElementImpl> parameters) {
     MethodElementImpl method = MethodElementImpl(methodName, 0);
     method.enclosingElement3 = enclosingElement;
     method.parameters = parameters;
@@ -338,7 +338,7 @@ class ElementFactory {
     setter.isSetter = true;
     setter.isSynthetic = true;
     setter.variable2 = field;
-    setter.parameters = <ParameterElement>[parameter];
+    setter.parameters = [parameter];
     setter.returnType = VoidTypeImpl.instance;
     setter.isStatic = isStatic;
     field.setter = setter;

pkg/analyzer/lib/src/summary2/instance_member_inferrer.dart

@@ -189,7 +189,7 @@ class InstanceMemberInferrer {
       if (parameters.isEmpty) {
         return;
       }
-      var parameter = parameters[0] as ParameterElementImpl;
+      var parameter = parameters[0];
 
       if (overriddenSetters.any(_isCovariantSetter)) {
         parameter.inheritsCovariant = true;
@@ -227,7 +227,7 @@ class InstanceMemberInferrer {
     if (field != null) {
       if (field.setter != null) {
         if (overriddenSetters.any(_isCovariantSetter)) {
-          var parameter = field.setter!.parameters[0] as ParameterElementImpl;
+          var parameter = field.setter!.parameters[0];
           parameter.inheritsCovariant = true;
         }
       }
@@ -579,7 +579,7 @@ class InstanceMemberInferrer {
       return;
     }
 
-    var parameter = parameters[0] as ParameterElementImpl;
+    var parameter = parameters[0];
     if (!parameter.hasImplicitType) {
       element.isOperatorEqualWithParameterTypeFromObject = false;
       return;

pkg/analyzer/lib/src/test_utilities/mock_sdk_elements.dart

@@ -990,7 +990,7 @@ class _MockSdkElementsBuilder {
     String name = '',
     bool isConst = false,
     bool isFactory = false,
-    List<ParameterElement> parameters = const [],
+    List<ParameterElementImpl> parameters = const [],
   }) {
     var element = ConstructorElementImpl(name, 0);
     element.name2 = name.ifNotEmptyOrElse('new');
@@ -1014,7 +1014,7 @@ class _MockSdkElementsBuilder {
     String name,
     DartType returnType, {
     List<TypeParameterElement> typeFormals = const [],
-    List<ParameterElement> parameters = const [],
+    List<ParameterElementImpl> parameters = const [],
   }) {
     return FunctionElementImpl(name, 0)
       ..parameters = parameters
@@ -1071,15 +1071,15 @@ class _MockSdkElementsBuilder {
     String name,
     DartType returnType, {
     List<TypeParameterElement> typeFormals = const [],
-    List<ParameterElement> parameters = const [],
+    List<ParameterElementImpl> parameters = const [],
   }) {
     return MethodElementImpl(name, 0)
       ..parameters = parameters
       ..returnType = returnType
       ..typeParameters = typeFormals;
   }
 
-  ParameterElement _namedParameter(String name, DartType type,
+  ParameterElementImpl _namedParameter(String name, DartType type,
       {String? initializerCode}) {
     var parameter = DefaultParameterElementImpl(
       name: name,
@@ -1155,7 +1155,7 @@ class _MockSdkElementsBuilder {
     ];
   }
 
-  ParameterElement _positionalParameter(String name, DartType type) {
+  ParameterElementImpl _positionalParameter(String name, DartType type) {
     var parameter = ParameterElementImpl(
       name: name,
       nameOffset: 0,
@@ -1165,7 +1165,7 @@ class _MockSdkElementsBuilder {
     return parameter;
   }
 
-  ParameterElement _requiredParameter(String name, DartType type) {
+  ParameterElementImpl _requiredParameter(String name, DartType type) {
     var parameter = ParameterElementImpl(
       name: name,
       nameOffset: 0,

pkg/analyzer/test/generated/elements_types_mixin.dart

@@ -402,7 +402,7 @@ mixin ElementsTypesMixin {
     DartType returnType, {
     bool isStatic = false,
     List<TypeParameterElement> typeFormals = const [],
-    List<ParameterElement> parameters = const [],
+    List<ParameterElementImpl> parameters = const [],
   }) {
     return MethodElementImpl(name, 0)
       ..isStatic = isStatic