DeCo. Change to 'class EnumBody implements AstNode', not 'ClassBody'.

Paul and I discussed offline in the context of https://dart-review.googlesource.com/c/sdk/+/457161 and decided that `EnumBody` is different enough that it does not fit into the `ClassBody` hierarchy. For example `ClassDeclaration` has `body`, but it cannot have `EnumBody`. Bug: #61701 Change-Id: Icccbf87883cdfa42b0dd026a5ddc9a40d644a5ea Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/458440 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

Author: scheglov

pkg/analyzer/api.txt

@@ -871,7 +871,7 @@ package:analyzer/dart/ast/ast.dart:
  CatchClauseParameter (class extends AstNode):
  declaredFragment (getter: LocalVariableFragment?)
  name (getter: Token)
- ClassBody (class extends Object implements AstNode, sealed (immediate subtypes: BlockClassBody, ClassBodyImpl, EmptyClassBody, EnumBody), experimental)
+ ClassBody (class extends Object implements AstNode, sealed (immediate subtypes: BlockClassBody, ClassBodyImpl, EmptyClassBody), experimental)
  ClassDeclaration (class extends Object implements NamedCompilationUnitMember):
  abstractKeyword (getter: Token?)
  augmentKeyword (getter: Token?)
@@ -1050,7 +1050,7 @@ package:analyzer/dart/ast/ast.dart:
  semicolon (getter: Token)
  EmptyStatement (class extends Object implements Statement):
  semicolon (getter: Token)
- EnumBody (class extends Object implements ClassBody, sealed (immediate subtypes: EnumBodyImpl), experimental):
+ EnumBody (class extends Object implements AstNode, sealed (immediate subtypes: EnumBodyImpl), experimental):
  constants (getter: NodeList<EnumConstantDeclaration>)
  leftBracket (getter: Token)
  members (getter: NodeList<ClassMember>)

pkg/analyzer/lib/dart/ast/visitor.g.dart

@@ -214,7 +214,7 @@ class GeneralizingAstVisitor<R> implements AstVisitor<R> {
 
  @experimental
  @override
- R? visitEnumBody(EnumBody node) => visitClassBody(node);
+ R? visitEnumBody(EnumBody node) => visitNode(node);
 
  @override
  R? visitEnumConstantArguments(EnumConstantArguments node) => visitNode(node);

pkg/analyzer/lib/src/dart/ast/ast.dart

@@ -7077,7 +7077,7 @@ final class EmptyStatementImpl extends StatementImpl implements EmptyStatement {
 /// The enum declaration body, with constants and members.
 @AnalyzerPublicApi(message: 'exported by lib/dart/ast/ast.dart')
 @experimental
-sealed class EnumBody implements ClassBody {
+sealed class EnumBody implements AstNode {
  /// The enumeration constants being declared.
  NodeList<EnumConstantDeclaration> get constants;
 
@@ -7103,7 +7103,7 @@ sealed class EnumBody implements ClassBody {
  GenerateNodeProperty('rightBracket'),
  ],
 )
-final class EnumBodyImpl extends ClassBodyImpl implements EnumBody {
+final class EnumBodyImpl extends AstNodeImpl implements EnumBody {
  @generated
  @override
  final Token leftBracket;