see Symbol Symbol::delete_package

#
# of Safe.pm lineage
#
sub delete_package ($) {
    my $pkg = shift;

    # expand to full symbol table name if needed

    unless ($pkg =~ /^main::.*::$/) {
        $pkg = "main$pkg"    if    $pkg =~ /^::/;
        $pkg = "main::$pkg"    unless    $pkg =~ /^main::/;
        $pkg .= '::'        unless    $pkg =~ /::$/;
    }

    my($stem, $leaf) = $pkg =~ m/(.*::)(\w+::)$/;
    my $stem_symtab = *{$stem}{HASH};
    return unless defined $stem_symtab and exists $stem_symtab->{$leaf
+};


    # free all the symbols in the package

    my $leaf_symtab = *{$stem_symtab->{$leaf}}{HASH};
    foreach my $name (keys %$leaf_symtab) {
        undef *{$pkg . $name};
    }

    # delete the symbol table

    %$leaf_symtab = ();
    delete $stem_symtab->{$leaf};
}
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