Microsoft.CodeAnalysis.GenerateMember.GenerateEnumMember.AbstractGenerateEnumMemberService<TService, TSimpleNameSyntax, TExpressionSyntax>.TryInitializeIdentifierNameState(Microsoft.CodeAnalysis.SemanticDocument, TSimpleNameSyntax, System.Threading.CancellationToken, out Microsoft.CodeAnalysis.SyntaxToken, out TExpressionSyntax)