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using System;
 
public class Test
{
    Func<T1, R> then<T1,T2,R>(this Func<T1, T2> f, Func<T2, R> g)
    {
        return (x) => g(f(x));
    }
 
    public static void Main()
    {
      Func<int,int> f = (x) => (x * 2);
      Func<int,int> g = (y) => (y + 10);
      Func<int,int> h = f.then(g);
      System.Console.WriteLine(h(10));
    }
}

prog.cs(14,27): error CS1061: Type `System.Func<int,int>' does not contain a definition for `then' and no extension method `then' of type `System.Func<int,int>' could be found (are you missing a using directive or an assembly reference?)
/usr/lib/mono/gac/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty