Use rb_inspect for Ractor error

Previously the object was used directly, which calls `to_s` if defined.
We should use rb_inspect to get a value suitable for display to the
programmer.

1 files changed, 1 insertions, 1 deletions

diff --git a/ractor.c b/ractor.c
index 75371cfa6f..2388729f83 100644
--- a/ractor.c
+++ b/ractor.c
@@ -3163,7 +3163,7 @@ make_shareable_check_shareable(VALUE obj)
             return traverse_cont;
         }
         else {
-            rb_raise(rb_eRactorError, "can not make shareable object for %"PRIsVALUE, obj);
+            rb_raise(rb_eRactorError, "can not make shareable object for %+"PRIsVALUE, obj);
         }
     }