class Psych::Handler

called with "ponies".
&ponies is the achor, *ponies is the alias. In this case, alias is

- *ponies
- first element
--- &ponies

Here we have an example of an array that references itself in YAML:

=== Example

of the anchor found.
Called when an alias is found to +anchor+. +anchor+ will be the name
##

def alias anchor
end