(a string left around from the loading of the Unicode \w)
"UTF-8 panic, blocks, coredumps, etc. in debugger with \w and m//g"
http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2002-01/msg01267.html
p4raw-id: //depot/perl@14914
#define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim))
#define HOPMAYBE3c(pos,off,lim) ((char*)HOPMAYBE3(pos,off,lim))
-#define LOAD_UTF8_CHARCLASS(a,b) STMT_START { if (!CAT2(PL_utf8_,a)) (void)CAT2(is_utf8_, a)((U8*)b); } STMT_END
+#define LOAD_UTF8_CHARCLASS(a,b) STMT_START { if (!CAT2(PL_utf8_,a)) { ENTER; save_re_context(); (void)CAT2(is_utf8_, a)((U8*)b); LEAVE; } } STMT_END
/* for use after a quantifier and before an EXACT-like node -- japhy */
#define JUMPABLE(rn) ( \