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my @in = qw(aaa bbb ccc);
my @out = map { local $_ = $_; s/.$/x/; $_ } @in;
print "@in\n=>\n@out\n";

my @out = map { (my $s = $_) =~ s/.$/x/; $s } @in;

my $_;

# ...

my @out = map { s/.$/x/; $_ } @in;