push @a;
It is syntax which will compile, but it does generate a warning. Can you show an example of where this would be used?
use strict;
use warnings;
use diagnostics;
use Data::Dumper;
my @a = 1..3;
push @a;
print Dumper(\@a);
__END__
% ./728108.pl
Useless use of push with no values at ./728108.pl line 9 (#1)
(W syntax) You used the push() or unshift() function with no argum
+ents
apart from the array, like push(@x) or unshift(@foo). That won't
usually have any effect on the array, so is completely useless. It
+'s
possible in principle that push(@tied_array) could have some effec
+t
if the array is tied to a class which implements a PUSH method. If
+ so,
you can write it as push(@tied_array,()) to avoid this warning.
$VAR1 = [
1,
2,
3
];
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