added ShouldNotHappenException

Author: dg

src/Utils/Iterables.php

@@ -233,6 +233,7 @@ public static function toIterator(iterable $iterable): \Iterator
 			$iterable instanceof \Iterator => $iterable,
 			$iterable instanceof \IteratorAggregate => self::toIterator($iterable->getIterator()),
 			is_array($iterable) => new \ArrayIterator($iterable),
+			default => throw new Nette\ShouldNotHappenException,
 		};
 	}
 }

src/exceptions.php

@@ -104,3 +104,11 @@ class OutOfRangeException extends \OutOfRangeException
 class UnexpectedValueException extends \UnexpectedValueException
 {
 }
+
+
+/**
+ * Houston, we have a problem.
+ */
+class ShouldNotHappenException extends \LogicException
+{
+}