From 1c1fa5d968b3727b79f0b68dc3c2e94e2f05c992 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Venturo?= <nicolas.venturo@gmail.com>
Date: Wed, 7 Aug 2019 21:35:04 -0300
Subject: [PATCH] Silence false positive warning on preValidatePurchase (#1857)

---
 contracts/crowdsale/Crowdsale.sol | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contracts/crowdsale/Crowdsale.sol b/contracts/crowdsale/Crowdsale.sol
index 824ba83cf..03fda95a5 100644
--- a/contracts/crowdsale/Crowdsale.sol
+++ b/contracts/crowdsale/Crowdsale.sol
@@ -138,6 +138,7 @@ contract Crowdsale is ReentrancyGuard {
     function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view {
         require(beneficiary != address(0), "Crowdsale: beneficiary is the zero address");
         require(weiAmount != 0, "Crowdsale: weiAmount is 0");
+        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
     }
 
     /**