From d96f04d73a5feb15b9d27bd23af2f7325732bb03 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@ruby-lang.org>
Date: Thu, 10 Oct 2019 16:10:58 +0900
Subject: [PATCH] add "[FATAL]" marker on abort

Indicate that the situation is fatal.
---
 error.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/error.c b/error.c
index 3a63a5f2a9..408a163f1f 100644
--- a/error.c
+++ b/error.c
@@ -2640,6 +2640,7 @@ rb_raise(VALUE exc, const char *fmt, ...)
     }
     else {
         /* Not in a ruby thread */
+        fprintf(stderr, "%s", "[FATAL] ");
         vfprintf(stderr, fmt, args);
         abort();
     }