Warn if use of OfType<T>() would provably result in an empty sequence, because we can see that the input type in the sequence will never be the specified type.

Category: Reliability
Suggested severity: Warning

UPDATE FROM roslyn-analyzer issue :

The following will always throw an InvalidCastException at runtime:

new int[] { 1 }.Cast<string>().ToList();
new float[] { 1f }.Cast<double>().ToList();
new int[] { 1 }.Cast<long>().ToList();

Perhaps worse, this will return an enumerable that fully enumerates the source and then returns no items silently:

enumerableOfApple.OfType<Orange>()

Both of these situations are likely to be a mistake.

Ther is a PR out for review