From ea59fadab8a668ba7d4ce53246cb72be6f7cd38f Mon Sep 17 00:00:00 2001
From: Lawrence Forman <lawrence@0xproject.com>
Date: Wed, 22 Apr 2020 15:07:44 -0400
Subject: [PATCH] `@0x/contracts-zero-ex`: Add `Unused` to `StorageId` enum

---
 contracts/zero-ex/contracts/src/storage/LibStorage.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/zero-ex/contracts/src/storage/LibStorage.sol b/contracts/zero-ex/contracts/src/storage/LibStorage.sol
index 403a1440c6..083f933a4f 100644
--- a/contracts/zero-ex/contracts/src/storage/LibStorage.sol
+++ b/contracts/zero-ex/contracts/src/storage/LibStorage.sol
@@ -30,6 +30,7 @@ library LibStorage {
 
     /// @dev Storage IDs for feature storage buckets.
     enum StorageId {
+        Unused, // Unused buffer for state accidents.
         Proxy,
         SimpleFunctionRegistry,
         Ownable,
@@ -44,7 +45,6 @@ library LibStorage {
         pure
         returns (uint256 offset)
     {
-        // We don't use safeMul here to save gas.
         // This should never overflow with a reasonable `STORAGE_OFFSET_MULTIPLIER`
         // because Solidity will do a range check on `storageId` during the cast.
         return uint256(storageId) * STORAGE_OFFSET_MULTIPLIER;