Add gap back to MailboxClient

The gap should ensure MailboxClient is upgrade-safe as long as future additions to the contract reduce the gap properly.
hyperlane-xyz · Nov 9, 2023 · aa3d6a5 · aa3d6a5
1 parent c44fd29
commit aa3d6a5
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/solidity/contracts/client/MailboxClient.sol b/solidity/contracts/client/MailboxClient.sol
@@ -22,6 +22,8 @@ abstract contract MailboxClient is OwnableUpgradeable {
 
     IInterchainSecurityModule public interchainSecurityModule;
 
+    uint256[48] private __GAP; // gap for upgrade safety
+
     // ============ Modifiers ============
     modifier onlyContract(address _contract) {
         require(