robin barker dozhixyupvhnplcouk could implemented bit 0x01000000 h hv_string_ok clearer solution obtrusive would introduce separate warning category portable_vstring c would implicit c c implicit c well technically solutions equivalent h one avoids using bit warning bit vector tried implement h approach could work setget h c code way actually achieved right effect tried implementing warnings approach c c way c c got test failure topreg_namedcapturet attach guts later patch case someone work wrong simplest failure env perl_destruct_level1 perl ilib e keys assertion heshared_he_hehent_hek hek failed file hvc line 2257 global destruction suggestions welcome robin email attachments may contain confidential andor privileged material intended addressees named addressee must use retain disclose information npl management ltd guarantee email attachments free viruses npl management ltd registered england wales 2937881 registered office serco house 16 bartley wood business park hook hampshire united kingdom rg27 9uy wed 06 aug 2008 014340 0100 patch use 5010 ugly use 5100 warns