private static Task <Document> RefactorAsync(
Document document,
BlockSyntax body,
ITypeSymbol typeSymbol,
SemanticModel semanticModel,
CancellationToken cancellationToken)
{
int position = body.OpenBraceToken.FullSpan.End;
ExpressionSyntax returnExpression = typeSymbol.ToDefaultValueSyntax(semanticModel, position);
ReturnStatementSyntax returnStatement = SyntaxFactory.ReturnStatement(returnExpression);
BlockSyntax newBody = body.InsertStatement(returnStatement);
return(document.ReplaceNodeAsync(body, newBody, cancellationToken));
}
