Confusing error message when trying to create delegate from method group of ref extension method with closed 'this' argument

[controlflow]

Version Used:

master branch @ march 2

Steps to Reproduce:

static class C {
  static int M(in this int x) => 1;
  static void Main() {
    System.Func<int> f = 1.M;
  }
}

Expected Behavior:

CS1113: Extension method 'C.M(int)' defined on value type 'int' cannot be used to create delegates

Actual Behavior:

CS0123: No overload for 'M' matches delegate 'Func'