__attribute__warn_unused_result__
__attribute__nonnull__(pTHX_1);
-STATIC void S_checkcomma(pTHX_ char *s, const char *name, const char *what)
+STATIC void S_checkcomma(pTHX_ const char *s, const char *name, const char *what)
__attribute__nonnull__(pTHX_1)
__attribute__nonnull__(pTHX_2)
__attribute__nonnull__(pTHX_3);