Issue 23181. Fix for ParameterElement.node.

pkg/analyzer/lib/src/generated/element_handle.dart

Index: pkg/analyzer/lib/src/generated/element_handle.dart
diff --git a/pkg/analyzer/lib/src/generated/element_handle.dart b/pkg/analyzer/lib/src/generated/element_handle.dart
index 0cb42ece90c3e8a59aa56eba7523ead91a1601f0..07c7f3abed831e8188f53542fc667e4d6b39f7bb 100644
--- a/pkg/analyzer/lib/src/generated/element_handle.dart
+++ b/pkg/analyzer/lib/src/generated/element_handle.dart
@@ -600,6 +600,9 @@ class FieldElementHandle extends PropertyInducingElementHandle
 
   @override
   ElementKind get kind => ElementKind.FIELD;
+
+  @override
+  VariableDeclaration get node => actualElement.node;
 }
 
 /**
@@ -839,6 +842,9 @@ class LocalVariableElementHandle extends VariableElementHandle
   ElementKind get kind => ElementKind.LOCAL_VARIABLE;
 
   @override
+  VariableDeclaration get node => actualElement.node;
+
+  @override
   SourceRange get visibleRange => actualElement.visibleRange;
 }
 
@@ -1085,9 +1091,6 @@ abstract class VariableElementHandle extends ElementHandle
       actualElement.isPotentiallyMutatedInScope;
 
   @override
-  VariableDeclaration get node => actualElement.node;
-
-  @override
   DartType get type => actualElement.type;
 }
 /**