allow implicit target type deduction

[kasperk81]

foreach (var n in [1,2,3]) rightfully throws error CS9176: There is no target type for the collection expression. and expects (int[]) cast.

compiler should at least be able to deduce int[] implicitly when type is specified foreach (int n in [1,2,3])?

[CyrusNajmabadi]

This is not a compiler issue. This is a request to expand what the language supports. Those requests are tracked at dotnet/csharplang. Thanks!