From a3b9960fbd1e76bfb90c8c1e34a8fd7708ef44d9 Mon Sep 17 00:00:00 2001
From: jMyles <justin@justinholmes.com>
Date: Tue, 21 Nov 2017 22:12:27 -0800
Subject: [PATCH] Added sentinel for missing return value - see
 https://github.com/python/mypy/issues/4223#issuecomment-342865133.

---
 nkms/keystore/keypairs.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/nkms/keystore/keypairs.py b/nkms/keystore/keypairs.py
index 8c796a4886..aab1302d90 100644
--- a/nkms/keystore/keypairs.py
+++ b/nkms/keystore/keypairs.py
@@ -58,6 +58,7 @@ def deserialize_key(key_data: bytes) -> 'Keypair':
                 return SigningKeypair(privkey=key)
         else:
             raise ValueError("Unable to determine which type of keypair this is - keypair_byte was {}".format(keypair_byte))
+        assert False
 
 
 class EncryptingKeypair(Keypair):