From 31110d820cc1258cbc84b46ecc65b254c7d5529a Mon Sep 17 00:00:00 2001
From: Kenichi Kamiya <kachick1@gmail.com>
Date: Sun, 3 Nov 2019 09:24:55 +0900
Subject: Improve warning message

https://github.com/ruby/ruby/pull/2637#discussion_r341812475
---
 re.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 're.c')

diff --git a/re.c b/re.c
index 6b8eda4df8..34880a849c 100644
--- a/re.c
+++ b/re.c
@@ -3324,7 +3324,7 @@ rb_reg_match_m(int argc, VALUE *argv, VALUE re)
     }
 
     if (NIL_P(str)) {
-        rb_warn("given argument is nil");
+        rb_warn("given argument is nil; this will raise a TypeError in the next release");
     }
     pos = reg_match_pos(re, &str, pos);
     if (pos < 0) {
@@ -3372,7 +3372,7 @@ rb_reg_match_p(VALUE re, VALUE str, long pos)
     int tmpreg;
 
     if (NIL_P(str)) {
-        rb_warn("given argument is nil");
+        rb_warn("given argument is nil; this will raise a TypeError in the next release");
         return Qfalse;
     }
     str = SYMBOL_P(str) ? rb_sym2str(str) : StringValue(str);
-- 
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