use strict;
use warnings;
use YAML;
use Data::Dumper;
my $d = [{"- test" => ""}];
my $yaml= Dump $d;
print "YAML:\n$yaml";
my $x = Load $yaml;
print Dumper $x;

Ausgabe:
YAML:
--- #YAML:1.0
- '- test': ''
--- !perl/YAML::Error
code: YAML_PARSE_ERR_SINGLE_LINE
msg: Couldn't parse single line value
line: 2
document: 1
...
 at ...