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...if an AUTOLOAD subroutine is defined in the package or
packages used to locate the original subroutine, then that
...
name of the original subroutine magically appears in the
global $AUTOLOAD variable of the same package as the
AUTOLOAD routine

# the following code throws a compile time error
package TestPackage;
...
sub AUTOLOAD {
    print $AUTOLOAD, " is not available\n";
}