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-rw-r--r--src/error.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/error.c b/src/error.c
index 256f9169d..5d9b367bd 100644
--- a/src/error.c
+++ b/src/error.c
@@ -88,7 +88,7 @@ exc_exception(mrb_state *mrb, mrb_value self)
* no message is set).
*/
-mrb_value
+static mrb_value
exc_to_s(mrb_state *mrb, mrb_value exc)
{
mrb_value mesg = mrb_attr_get(mrb, exc, MRB_SYM(mesg));