From 67d0f4821ff9ae550425a66202710d82de886384 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 25 Nov 2022 14:20:46 +0900
Subject: [PATCH] [Bug #19145] `volatile` on an argument may not be effective

---
 eval_error.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/eval_error.c b/eval_error.c
index 0112dece0d..e02f54e8e6 100644
--- a/eval_error.c
+++ b/eval_error.c
@@ -333,11 +333,12 @@ rb_error_write(VALUE errinfo, VALUE emesg, VALUE errat, VALUE str, VALUE opt, VA
 }
 
 static void
-rb_ec_error_print_detailed(rb_execution_context_t *volatile ec, volatile VALUE errinfo, VALUE str, volatile VALUE emesg)
+rb_ec_error_print_detailed(rb_execution_context_t *const ec, const VALUE errinfo, const VALUE str, VALUE emesg0)
 {
     volatile uint8_t raised_flag = ec->raised_flag;
     volatile VALUE errat = Qundef;
     volatile bool written = false;
+    volatile VALUE emesg = emesg0;
 
     VALUE opt = rb_hash_new();
     VALUE highlight = rb_stderr_tty_p() ? Qtrue : Qfalse;