Reads better perhaps, but doesn't actually work. First argument to push must be something starting with the @ sigil or, with Perl 5.14+, a reference to an unblessed array.
c:\@Work\Perl>perl -wMstrict -le
"print $];
;;
my (@streams, @spaces);
my $y = 'Y';
push (($y eq 'Y' ? @streams : @spaces), 'Z');
print qq{(@streams) (@spaces)};
"
5.014004
Not an ARRAY reference at -e line 1.
c:\@Work\Perl>perl -wMstrict -le
"print $];
;;
my (@streams, @spaces);
my $y = 'Y';
push (($y eq 'Y' ? \@streams : \@spaces), 'Z');
print qq{(@streams) (@spaces)};
"
5.014004
(Z) ()
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