ArrayTypeMismatchException when using array of generic ICollection<T> or IList<T>

[jonpryor]

Steps to Reproduce

1. Run the following program:

using System.Collections.Generic;

public interface IFoo
{
  int MyInt { get; }
}

public class Bar : IFoo
{
  public int MyInt => 0;
}

class App {
  public static void Main ()
  {
    ICollection<IFoo> arr1 = new Bar[1] { new Bar() };
    ICollection<IFoo> arr2 = new Bar[1] { new Bar() };

    ICollection<IFoo>[] a2d = new ICollection<IFoo>[2] {
      arr1,
      arr2,
    };
  }
}

Expected Behavior

No exception thrown.

Actual Behavior

Throws an ArrayTypeMismatchException at last line of test code at runtime when using ICollection<T> or IList<T>.

System.ArrayTypeMismatchException: Attempted to access an element as a type incompatible with the array.
  at (wrapper stelemref) System.Object:virt_stelemref_interface (intptr,object)
  at App.Main () [0x0001f] in /Users/jon/tmp/csharp/gxa-1120.cs:19 

The following types are working properly as expected:

• IEnumerable
• IEnumerable<T>
• ICollection
• IList

Code is compiling successfully with all types.

Version Information

Visual Studio: 15.5.2
Mono: MonoAndroid70 / 4.0.30319 / 8.1.0.25
Android: 7.0
Kernel: 4.1.18-gdd36b34

On which platforms did you notice this

-[X] macOS
-[ ] Linux
-[ ] Windows
-[X] Xamarin.Android

Version Used:

Desktop macOS: 5.4.1.7 (2017-06/e66d9abbb27)
Xamarin.Android 8.1: d15-5-2017-06/950ea65

[jonpryor]

Originally filed at: dotnet/android#1120

[lambdageek]

@alexischr Does this look like a duplicate of or related to Bugzilla #59400

[alexischr]

It looks related but it is not a duplicate as that one is specifically for GetEnumerator behavior and its fix won't fix this.