public static IEnumerable <Type> GetTypes(this IEnumerable <Assembly> assemblies, Type t)
=> from assembly in assemblies.Distinct()
from type in assembly.GetTypes()
where SystemExtensions.IsAssignableFrom(t, type)
where !type.IsAbstract
where !type.IsGenericTypeDefinition
where !type.IsInterface
select type;
static bool Predicate(Type x, Type ifaceType) => (x != ifaceType) && !reserved.Contains(x) && !reservedRoot.Any(t => SystemExtensions.IsAssignableFrom(t, x));