EC#: Syntax error in `Foo<T?>`

[qwertie]

This gives a syntax error:

public static IEnumerable<T> WhereNotNull<T>(this IEnumerable<T?> list) where T : struct
{
	foreach (var item in list)
		if (item != null)
			yield return item.Value;
}

There are a couple of workarounds - you can use Nullable<T>, or this alternate syntax:

public static IEnumerable<T> WhereNotNull<T>(this IEnumerable<@`'?`<T>> list) where T : struct