Fixed wrong `MRB_WITHOUT_FLOAT` condition; ref
MODIFY
src/class.c
src/class.c
@@ -1309,9 +1309,9 @@ mrb_singleton_class(mrb_state *mrb, mrb_value v)
case MRB_TT_FIXNUM:
#ifndef MRB_WITHOUT_FLOAT
case MRB_TT_FLOAT:
+#endif
mrb_raise(mrb, E_TYPE_ERROR, "can't define singleton");
return mrb_nil_value(); /* not reached */
-#endif
default:
break;
}

Fixed wrong `MRB_WITHOUT_FLOAT` condition; ref #3827