My-Fourth-Modules-Script.pm6

#!/usr/bin/env perl6

package My-Fourth-Modules-Script {

  proto MAIN($) is export { * }

  multi MAIN($x) {
    say "This is the inside MAIN called with $x";
  }
}

multi sub MAIN($x) {
    say "This is the outer MAIN called with $x";
    My-Second-Modules-Script::MAIN($x);
}

# $ ./My-Fourth-Modules-Script.pm6
# Usage:
#   ./My-Fourth-Modules-Script.pm6 <x>
# $ ./My-Fourth-Modules-Script.pm6 32
# This is the outer MAIN called with 32
# Could not find symbol '&MAIN'
#   in sub MAIN at ./My-Fourth-Modules-Script.pm6 line 14
#   in block <unit> at ./My-Fourth-Modules-Script.pm6 line 3