From 9b610d3db4cf640d82cf185ca4585a9aa19cc08b Mon Sep 17 00:00:00 2001
From: Yamen Merhi <yamennmerhi@gmail.com>
Date: Fri, 3 Feb 2023 21:15:41 +0200
Subject: [PATCH] Add warning for `supportsERC165InterfaceUnchecked` edge case
 (#4017)

(cherry picked from commit d13ec90f3719b6a1182b96455aea1ba21699f197)
---
 contracts/utils/introspection/ERC165Checker.sol | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/contracts/utils/introspection/ERC165Checker.sol b/contracts/utils/introspection/ERC165Checker.sol
index 4c5fe2092..2b75ba737 100644
--- a/contracts/utils/introspection/ERC165Checker.sol
+++ b/contracts/utils/introspection/ERC165Checker.sol
@@ -102,6 +102,10 @@ library ERC165Checker {
      * @dev Assumes that account contains a contract that supports ERC165, otherwise
      * the behavior of this method is undefined. This precondition can be checked
      * with {supportsERC165}.
+     *
+     * Some precompiled contracts will falsely indicate support for a given interface, so caution
+     * should be exercised when using this function.
+     *
      * Interface identification is specified in ERC-165.
      */
     function supportsERC165InterfaceUnchecked(address account, bytes4 interfaceId) internal view returns (bool) {