minetest.check for falling

Description
Helper function which causes nodes to detach (drop as items) or fall, in the case of falling nodes. This code not only makes the node at  fall or drop, but also adjacent nodes that needs to fall or drop. This can potentially update thousands of nodes with a single call to this function.

The function performs no action if the considered node at  is not ready to fall down, or is not detached.

Nothing is returned.

Parameters:


 * — Position of node to update.