From d43d4acf2638ed50ab1542769c5d032c1aa8fb31 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Wed, 25 Nov 2020 15:51:31 +0900
Subject: [PATCH] fix error message

---
 ractor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ractor.c b/ractor.c
index 226c9bbf6f..491a1e3f71 100644
--- a/ractor.c
+++ b/ractor.c
@@ -821,7 +821,7 @@ ractor_select(rb_execution_context_t *ec, const VALUE *rs, int alen, VALUE yield
             wait_status |= wait_taking;
         }
         else {
-            rb_raise(rb_eArgError, "It should be ractor objects");
+            rb_raise(rb_eArgError, "should be a ractor object, but %"PRIsVALUE, v);
         }
     }
     rs = NULL;