Merge pull request #4727 from shuujii/exception-initialize-should-not-allow-two-or-more-arguments

`Exception#initialize` should not allow two or more arguments

src/error.c

@@ -44,10 +44,8 @@ static mrb_value
 exc_initialize(mrb_state *mrb, mrb_value exc)
 {
   mrb_value mesg;
-  mrb_int argc;
-  mrb_value *argv;
 
-  if (mrb_get_args(mrb, "|o*!", &mesg, &argv, &argc) >= 1) {
+  if (mrb_get_args(mrb, "|o", &mesg) == 1) {
     mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), mesg);
   }
   return exc;
@@ -590,9 +588,9 @@ mrb_init_exception(mrb_state *mrb)
 
   mrb->eException_class = exception = mrb_define_class(mrb, "Exception", mrb->object_class); /* 15.2.22 */
   MRB_SET_INSTANCE_TT(exception, MRB_TT_EXCEPTION);
-  mrb_define_class_method(mrb, exception, "exception", mrb_instance_new,  MRB_ARGS_ANY());
+  mrb_define_class_method(mrb, exception, "exception", mrb_instance_new,  MRB_ARGS_OPT(1));
   mrb_define_method(mrb, exception, "exception",       exc_exception,     MRB_ARGS_ANY());
-  mrb_define_method(mrb, exception, "initialize",      exc_initialize,    MRB_ARGS_ANY());
+  mrb_define_method(mrb, exception, "initialize",      exc_initialize,    MRB_ARGS_OPT(1));
   mrb_define_method(mrb, exception, "to_s",            exc_to_s,          MRB_ARGS_NONE());
   mrb_define_method(mrb, exception, "message",         exc_message,       MRB_ARGS_NONE());
   mrb_define_method(mrb, exception, "inspect",         exc_inspect,       MRB_ARGS_NONE());