+STATIC SB_enum S_advance_one_SB(pTHX_ U8 ** curpos, const U8 * const strend, const bool utf8_target)
+ __attribute__warn_unused_result__;
+#define PERL_ARGS_ASSERT_ADVANCE_ONE_SB \
+ assert(curpos); assert(strend)
+
+STATIC WB_enum S_advance_one_WB(pTHX_ U8 ** curpos, const U8 * const strend, const bool utf8_target)
+ __attribute__warn_unused_result__;
+#define PERL_ARGS_ASSERT_ADVANCE_ONE_WB \
+ assert(curpos); assert(strend)
+
+STATIC SB_enum S_backup_one_SB(pTHX_ const U8 * const strbeg, U8 ** curpos, const bool utf8_target)
+ __attribute__warn_unused_result__;
+#define PERL_ARGS_ASSERT_BACKUP_ONE_SB \
+ assert(strbeg); assert(curpos)
+
+STATIC WB_enum S_backup_one_WB(pTHX_ WB_enum * previous, const U8 * const strbeg, U8 ** curpos, const bool utf8_target)
+ __attribute__warn_unused_result__;
+#define PERL_ARGS_ASSERT_BACKUP_ONE_WB \
+ assert(previous); assert(strbeg); assert(curpos)
+