internal static string Rewrite(string contextName, string rawFunction, Func <string, bool> isStaticMethod)
{
var csu = ParseCompilationUnit(
$"class __Temp {{ private Func<object> __prop => {rawFunction}; }}");
var csuRewritten = new Rewriter(contextName, isStaticMethod).Visit(csu);
return(csuRewritten
.DescendantNodes()
.OfType <ArrowExpressionClauseSyntax>()
.First()
.Expression
.ToFullString());
}