Scope: what does it mean ?
Lifetime: I assume to be restricted
to the function or do{} section

I mean, perhaps you leave the block with the var to early. But is look now like the spelling mistake that anon monk found.

use warnings;
{
  my $x = "xxx";
  # $x get out of scope.
}
# print $x currently $::x witch is undefined currently
print $x;
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Boris