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  1. or download this
    sub a {
   sub x { print "I came from a\n"; }
...
x();
a(); x();
b(); x();
  2. or download this
    I came from b
I came from b
I came from b
  3. or download this
    sub a {
    local(*x) = sub { "from a" };
...
sub doit {
    print "I came ", x(), "\n";
}