private SyntaxNode myExtSyntactical(SyntaxNode node, Scope scope, LexicalExtension <SyntaxToken> extension)
{
Assert.IsTrue(node is MethodDeclarationSyntax);
var method = node as MethodDeclarationSyntax;
Assert.IsTrue(method.Identifier.ToString() == "__extension");
var argString = RoslynCompiler.TokensToString(extension.Arguments);
Assert.IsTrue(argString == "(int i) ");
var arguments = CSharp.ParseParameterList(argString);
var codeString = RoslynCompiler.TokensToString(extension.Body);
var codeNode = CSharp.ParseStatement(codeString);
Assert.IsTrue(codeNode is BlockSyntax);
var code = codeNode as BlockSyntax;
return(method
.WithIdentifier(CSharp.ParseToken("my_ext_s"))
.WithParameterList(arguments)
.WithBody(code));
}