From 0f587ce17f4ad292f6f2d23d6244426046134f38 Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Wed, 22 Feb 2017 15:50:26 +0100
Subject: Make code_change/4 optional

---
 lib/stdlib/src/gen_statem.erl | 1 +
 1 file changed, 1 insertion(+)

(limited to 'lib')

diff --git a/lib/stdlib/src/gen_statem.erl b/lib/stdlib/src/gen_statem.erl
index ae50651c06..cacc932ec4 100644
--- a/lib/stdlib/src/gen_statem.erl
+++ b/lib/stdlib/src/gen_statem.erl
@@ -290,6 +290,7 @@
    [init/1, % One may use enter_loop/5,6,7 instead
     format_status/2, % Has got a default implementation
     terminate/3, % Has got a default implementation
+    code_change/4, % Only needed by advanced soft upgrade
     %%
     state_name/3, % Example for callback_mode() =:= state_functions:
     %% there has to be a StateName/3 callback function
-- 
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