// CS0121: The call is ambiguous between the following methods or properties: `Test.Foo<int,int>(int, System.Linq.Expressions.Expression<System.Func<int,int>>)' and `Test.Foo<int,int>(int, System.Func<int,int>)' // Line: 22 using System; using System.Linq; using System.Linq.Expressions; class Test { static int Foo<T, R> (T t, Expression<Func<T, R>> e) { return 5; } static int Foo<T, R> (T t, Func<T, R> e) { return 0; } static void Main () { Foo (1, i => i); } }