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sub make_closure {
   my ($str) = @_;
...
say $sub->();   # 'hi'
$str = 'hello';
say $sub->();   # 'hi'

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my $str = 'hi';
my $sub = eval qq{ sub { "\Q$str\E" } } or die $@;
...
say $sub->();   # 'hi'
$str = 'hello';
say $sub->();   # 'hi'