https://git.ruby-lang.org/ruby.git/commit/?id=62b47196e4

From 62b47196e44757012b32e52a6b4af7560e59e334 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 21 May 2020 11:55:55 +0900
Subject: Added UNREACHABLE_RETURN

To get rid of a void function at the end of non-void function.

diff --git a/include/ruby/internal/scan_args.h b/include/ruby/internal/scan_args.h
index dae9d65..d9329e7 100644
--- a/include/ruby/internal/scan_args.h
+++ b/include/ruby/internal/scan_args.h
@@ -345,6 +345,7 @@ rb_scan_args_set(int kw_flag, int argc, const VALUE *argv, https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/scan_args.h#L345
 
   argc_error:
     rb_error_arity(argc, n_mand, f_var ? UNLIMITED_ARGUMENTS : n_mand + n_opt);
+    UNREACHABLE_RETURN(-1);
 #undef rb_scan_args_next_param
 }
 
-- 
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