Create List<DartType> instead of List<TypeParameterType>.

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

Index: pkg/analyzer/lib/src/dart/element/element.dart
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 04e7cf260f0ace87522f783343bf6f96e47c3995..3d1045e63ee26549b6ce233dc51cf2991c6a005d 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -5376,9 +5376,9 @@ class MethodElementImpl extends ExecutableElementImpl implements MethodElement {
   }
 
   @override
-  List<TypeParameterType> get allEnclosingTypeParameterTypes {
+  List<DartType> get allEnclosingTypeParameterTypes {
     if (isStatic) {
-      return const <TypeParameterType>[];
+      return const <DartType>[];
     }
     return super.allEnclosingTypeParameterTypes;
   }
@@ -6619,9 +6619,9 @@ class PropertyAccessorElementImpl extends ExecutableElementImpl
   }
 
   @override
-  List<TypeParameterType> get allEnclosingTypeParameterTypes {
+  List<DartType> get allEnclosingTypeParameterTypes {
     if (isStatic) {
-      return const <TypeParameterType>[];
+      return const <DartType>[];
     }
     return super.allEnclosingTypeParameterTypes;
   }
@@ -7262,24 +7262,24 @@ abstract class TypeParameterizedElementMixin
     implements TypeParameterizedElement, ElementImpl {
   int _nestingLevel;
   List<TypeParameterElement> _typeParameterElements;
-  List<TypeParameterType> _typeParameterTypes;
-  List<TypeParameterType> _allTypeParameterTypes;
+  List<DartType> _typeParameterTypes;
+  List<DartType> _allTypeParameterTypes;
 
   /**
    * Return all type parameter types of the element that encloses element.
    * Not `null`, but might be empty for top-level and static class members.
    */
-  List<TypeParameterType> get allEnclosingTypeParameterTypes {
+  List<DartType> get allEnclosingTypeParameterTypes {
     return enclosingTypeParameterContext?.allTypeParameterTypes ??
-        const <TypeParameterType>[];
+        const <DartType>[];
   }
 
   /**
    * Return all type parameter types of this element.
    */
-  List<TypeParameterType> get allTypeParameterTypes {
+  List<DartType> get allTypeParameterTypes {
     if (_allTypeParameterTypes == null) {
-      _allTypeParameterTypes = <TypeParameterType>[];
+      _allTypeParameterTypes = <DartType>[];
       // The most logical order would be (enclosing, this).
       // But we have to have it like this to be consistent with (inconsistent
       // by itself) element builder for generic functions.