[migrate] display_string_builder.dart

Change-Id: I5e02318292151adcf8d3672860cf20847aa8ccef
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/416764
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: bwilkerson

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

@@ -2,15 +2,13 @@
 // 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.
 
-// ignore_for_file: analyzer_use_new_elements
-
 import 'package:_fe_analyzer_shared/src/type_inference/type_analyzer_operations.dart'
     show Variance;
-import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/element2.dart';
 import 'package:analyzer/dart/element/nullability_suffix.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
+import 'package:analyzer/src/dart/element/member.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/type_algebra.dart';
 import 'package:analyzer/src/utilities/extensions/element.dart';
@@ -129,7 +127,10 @@ class ElementDisplayStringBuilder {
     _write(name);
 
     if (element.kind != ElementKind.GETTER) {
-      _writeTypeParameters(element.typeParameters);
+      var typeParameters = (element is ExecutableElementImpl)
+          ? element.typeParameters
+          : (element as ExecutableMember).typeParameters;
+      _writeTypeParameters(typeParameters);
       _writeFormalParameters(
         element.parameters,
         forElement: true,
@@ -409,12 +410,6 @@ class ElementDisplayStringBuilder {
   }
 
   void writeVariableElement(VariableElementOrMember element) {
-    switch (element) {
-      case FieldElement(isAugmentation: true):
-      case TopLevelVariableElement(isAugmentation: true):
-        _write('augment ');
-    }
-
     _writeType(element.type);
     _write(' ');
     _write(element.displayName);
@@ -547,15 +542,15 @@ class ElementDisplayStringBuilder {
     }
   }
 
-  void _writeTypeParameters(List<TypeParameterElement> elements) {
+  void _writeTypeParameters(List<TypeParameterElementImpl> elements) {
     if (elements.isEmpty) return;
 
     _write('<');
     for (var i = 0; i < elements.length; i++) {
       if (i != 0) {
         _write(', ');
       }
-      (elements[i] as TypeParameterElementImpl).appendTo(this);
+      elements[i].appendTo(this);
     }
     _write('>');
   }
@@ -672,7 +667,7 @@ class ElementDisplayStringBuilder {
 
 enum _WriteFormalParameterKind { requiredPositional, optionalPositional, named }
 
-extension on LibraryImportElement {
+extension on LibraryImportElementImpl {
   String get libraryName {
     if (uri case DirectiveUriWithRelativeUriString uri) {
       return uri.relativeUriString;