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my $sub = sub { my ($str) = @_; sub { $str } }->($str);

my $sub = sub { my $str = $str; sub { $str } }->();

my $sub = do { my $str = $str; sub { $str } };

my $str_copy = $str;
my $sub = sub { $str_copy };

for my $str (...) {
   ... sub { ... $str ... } ...
}

sub make_list_iterator { 
   my @list = @_;
...
}

my $iter = make_list_iterator(@list);