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using System.Collections.Generic;
 
public class Test
{
    public static void Main()
    {
        var item = new Foo();
        var inner = new List<Foo>();
        var outer = new List<List<Foo>>();
 
        inner.Add(item);
        outer.Add(inner);
 
        IEnumerable<IEnumerable<Foo>> data = outer;
 
        foreach (Foo foo in data)
        {
            foo.Bar();
        }
    }
}
 
public class Foo
{
    public void Bar()
    {
    }
}

prog.cs(14,39): error CS0266: Cannot implicitly convert type `System.Collections.Generic.List<System.Collections.Generic.List<Foo>>' to `System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable<Foo>>'. An explicit conversion exists (are you missing a cast?)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty