private SyntaxNode VisitTypeDeclaration(TypeDeclarationSyntax node, INamedTypeSymbol symbol)
{
if (node == null || symbol == null || symbol.AllInterfaces.Count != 1)
return node;
var face = symbol.AllInterfaces.Single();
if (!face.HasDocumentationComment())
return node;
if (symbol.GetDocumentationComment().Equals(face.GetDocumentationComment()))
return node;
var facenode = face.GetSyntaxNodes().Single();
return node.WithDocumentationComment(facenode.GetDocumentationCommentText());
}