From 02a962d35dab046e54e437616272146b57d024fb Mon Sep 17 00:00:00 2001
From: Paul Hauner <paul@paulhauner.com>
Date: Thu, 31 Jan 2019 18:32:23 +1100
Subject: [PATCH] Ensure per_epoch trans. happens before per_slot.

---
 eth2/types/src/beacon_state/slot_processing.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/eth2/types/src/beacon_state/slot_processing.rs b/eth2/types/src/beacon_state/slot_processing.rs
index 9501083f04..4693bd0692 100644
--- a/eth2/types/src/beacon_state/slot_processing.rs
+++ b/eth2/types/src/beacon_state/slot_processing.rs
@@ -16,6 +16,10 @@ impl BeaconState {
         previous_block_root: Hash256,
         spec: &ChainSpec,
     ) -> Result<(), Error> {
+        if (self.slot + 1) % spec.epoch_length == 0 {
+            self.per_epoch_processing(spec)?;
+        }
+
         self.slot += 1;
 
         let block_proposer = self.get_beacon_proposer_index(self.slot, spec)?;
@@ -32,10 +36,6 @@ impl BeaconState {
             let root = merkle_root(&self.latest_block_roots[..]);
             self.batched_block_roots.push(root);
         }
-
-        if self.slot % spec.epoch_length == 0 {
-            self.per_epoch_processing(spec)?;
-        }
         Ok(())
     }