What is @$ in perl?

I came across this, expecting it to be a typo for $@:

use strict;
use warnings;

eval {
  my $error = Not::Here->new();
};

warn @$;

And to my surprise it outputs this:

Can't locate object method "new" via package "Not::Here" (perhaps you forgot to load "Not::Here"?) at dollar_array.pl line 6. ...caught at dollar_array.pl line 9.

I'm unable to find any information about @$, and it's not listed on perlvar, nor in eval

Since the output show caught at ..., it seems that this is something in the exception handling of perl.