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-rw-r--r--thread_sync.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/thread_sync.c b/thread_sync.c
index b2b7d05088..1624c470a5 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -1423,7 +1423,7 @@ static VALUE
undumpable(VALUE obj)
{
rb_raise(rb_eTypeError, "can't dump %"PRIsVALUE, rb_obj_class(obj));
- UNREACHABLE;
+ UNREACHABLE_RETURN(Qnil);
}
static VALUE