++ Good catch!
The code itself parses as legal Perl:
$ perl -MO=Deparse,-p -e 'my $l = ref $a eq "ARRAY" ? ($a-> || $->[
+1]) : $a;'
(my $l = ((ref($a) eq 'ARRAY') ? ($a-> || ($- > )) : $a));
-e syntax OK
And, as you can see, your analysis is correct: '$-' is being compared with ''.
There's actually two adjacent lines like that in the source code:
# Deal with the case of an item actually being an array ref to 1 o
# hashrefs. Don't assign to $a or $b, as they're aliases to the or
my $l = ref $a eq 'ARRAY' ? ($a-> || $->) : $a;
my $r = ref $b eq 'ARRAY' ? ($b-> || $->) : $b;
I suspect those should be:
my $l = ref $a eq 'ARRAY' ? ($a-> || $a->) : $a;
my $r = ref $b eq 'ARRAY' ? ($b-> || $b->) : $b;
although, I haven't delved deeply enough into the code to say for certain.
I suggest you raise a bug report for this.
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