PERL_CALLCONV bool Perl_is_uni_xdigit_lc(pTHX_ UV c);
PERL_CALLCONV STRLEN Perl_is_utf8_char(pTHX_ U8 *p);
PERL_CALLCONV bool Perl_is_utf8_string(pTHX_ U8 *s, STRLEN len);
+PERL_CALLCONV bool Perl_is_utf8_string_loc(pTHX_ U8 *s, STRLEN len, U8 **p);
PERL_CALLCONV bool Perl_is_utf8_alnum(pTHX_ U8 *p);
PERL_CALLCONV bool Perl_is_utf8_alnumc(pTHX_ U8 *p);
PERL_CALLCONV bool Perl_is_utf8_idfirst(pTHX_ U8 *p);