Type inference with method groups does not support variance for signatures with ref parameters #55909
Description
Compile:
class Program
{
static void F1<T>(T t, object o) { }
static void F2<T>(T t, ref object o) { }
static void Main()
{
_ = new[] { F1<object>, F1<string> }; // ok
_ = new[] { F2<object>, F2<string> }; // error CS0826: No best type found for implicitly-typed array
}
}Expected: Compiler infers a common delegate signature void *(object, ref object) for the second array.
Actual: (9,13): error CS0826: No best type found for implicitly-typed array
Relates to test plan #52192