Ubeswap diff

ubeswap.patch

diff --git a/contracts/uniswapv2/README.md b/contracts/uniswapv2/README.md
index ffa15f4..88cbeba 100644
--- a/contracts/uniswapv2/README.md
+++ b/contracts/uniswapv2/README.md
@@ -1,13 +1,14 @@
 # Uniswap V2 Area
 
-Code from [Uniswap V2](https://github.com/Uniswap/uniswap-v2-core/tree/27f6354bae6685612c182c3bc7577e61bc8717e3/contracts) with the following modifications.
+Code from [Sushiswap](https://github.com/sushiswap/sushiswap/tree/017ac93b1f6e970516652629a4d1bc47a8c584d7/contracts) with the following modifications.
 
-1. Change contract version to 0.6.12 and do the necessary patching.
-2. Add `migrator` member in `UniswapV2Factory` which can be set by `feeToSetter`.
-3. Allow `migrator` to specify the amount of `liquidity` during the first mint. Disallow first mint if migrator is set.
+1. Remove `migrator` member in `UniswapV2Factory`
+2. Delete references to migrator in UniswapV2Pair.
+3. Delete all UniswapV2Router functions referencing ETH/WETH.
+4. Delete IWETH.
 
 To see all diffs:
 
 ```
-$ git diff 4c4bf551417e3df09a25aa0dbb6941cccbbac11a .
-```
\ No newline at end of file
+git diff 017ac93b1f6e970516652629a4d1bc47a8c584d7 .
+```
diff --git a/contracts/uniswapv2/UniswapV2ERC20.sol b/contracts/uniswapv2/UniswapV2ERC20.sol
index 4dbebc2..92b42bc 100644
--- a/contracts/uniswapv2/UniswapV2ERC20.sol
+++ b/contracts/uniswapv2/UniswapV2ERC20.sol
@@ -7,8 +7,8 @@ import './libraries/SafeMath.sol';
 contract UniswapV2ERC20 {
     using SafeMathUniswap for uint;
 
-    string public constant name = 'SushiSwap LP Token';
-    string public constant symbol = 'SLP';
+    string public constant name = 'Ubeswap LP Token';
+    string public constant symbol = 'ULP';
     uint8 public constant decimals = 18;
     uint  public totalSupply;
     mapping(address => uint) public balanceOf;
diff --git a/contracts/uniswapv2/UniswapV2Factory.sol b/contracts/uniswapv2/UniswapV2Factory.sol
index 5e1be45..8a4264f 100644
--- a/contracts/uniswapv2/UniswapV2Factory.sol
+++ b/contracts/uniswapv2/UniswapV2Factory.sol
@@ -8,7 +8,6 @@ import './UniswapV2Pair.sol';
 contract UniswapV2Factory is IUniswapV2Factory {
     address public override feeTo;
     address public override feeToSetter;
-    address public override migrator;
 
     mapping(address => mapping(address => address)) public override getPair;
     address[] public override allPairs;
@@ -49,14 +48,8 @@ contract UniswapV2Factory is IUniswapV2Factory {
         feeTo = _feeTo;
     }
 
-    function setMigrator(address _migrator) external override {
-        require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN');
-        migrator = _migrator;
-    }
-
     function setFeeToSetter(address _feeToSetter) external override {
         require(msg.sender == feeToSetter, 'UniswapV2: FORBIDDEN');
         feeToSetter = _feeToSetter;
     }
-
 }
diff --git a/contracts/uniswapv2/UniswapV2Pair.sol b/contracts/uniswapv2/UniswapV2Pair.sol
index fbd5dcf..f2aefb4 100644
--- a/contracts/uniswapv2/UniswapV2Pair.sol
+++ b/contracts/uniswapv2/UniswapV2Pair.sol
@@ -10,11 +10,6 @@ import './interfaces/IUniswapV2Factory.sol';
 import './interfaces/IUniswapV2Callee.sol';
 
 
-interface IMigrator {
-    // Return the desired amount of liquidity token that the migrator wants.
-    function desiredLiquidity() external view returns (uint256);
-}
-
 contract UniswapV2Pair is UniswapV2ERC20 {
     using SafeMathUniswap  for uint;
     using UQ112x112 for uint224;
@@ -124,15 +119,8 @@ contract UniswapV2Pair is UniswapV2ERC20 {
         bool feeOn = _mintFee(_reserve0, _reserve1);
         uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
         if (_totalSupply == 0) {
-            address migrator = IUniswapV2Factory(factory).migrator();
-            if (msg.sender == migrator) {
-                liquidity = IMigrator(migrator).desiredLiquidity();
-                require(liquidity > 0 && liquidity != uint256(-1), "Bad desired liquidity");
-            } else {
-                require(migrator == address(0), "Must not have migrator");
-                liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
-                _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
-            }
+            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
+            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
         } else {
             liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
         }
diff --git a/contracts/uniswapv2/UniswapV2Router02.sol b/contracts/uniswapv2/UniswapV2Router02.sol
index 3aad8f3..db0b1b7 100644
--- a/contracts/uniswapv2/UniswapV2Router02.sol
+++ b/contracts/uniswapv2/UniswapV2Router02.sol
@@ -9,26 +9,19 @@ import './libraries/TransferHelper.sol';
 import './interfaces/IUniswapV2Router02.sol';
 import './interfaces/IUniswapV2Factory.sol';
 import './interfaces/IERC20.sol';
-import './interfaces/IWETH.sol';
 
 contract UniswapV2Router02 is IUniswapV2Router02 {
     using SafeMathUniswap for uint;
 
     address public immutable override factory;
-    address public immutable override WETH;
 
     modifier ensure(uint deadline) {
         require(deadline >= block.timestamp, 'UniswapV2Router: EXPIRED');
         _;
     }
 
-    constructor(address _factory, address _WETH) public {
+    constructor(address _factory) public {
         factory = _factory;
-        WETH = _WETH;
-    }
-
-    receive() external payable {
-        assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
     }
 
     // **** ADD LIQUIDITY ****
@@ -76,30 +69,6 @@ contract UniswapV2Router02 is IUniswapV2Router02 {
         TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
         liquidity = IUniswapV2Pair(pair).mint(to);
     }
-    function addLiquidityETH(
-        address token,
-        uint amountTokenDesired,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline
-    ) external virtual override payable ensure(deadline) returns (uint amountToken, uint amountETH, uint liquidity) {
-        (amountToken, amountETH) = _addLiquidity(
-            token,
-            WETH,
-            amountTokenDesired,
-            msg.value,
-            amountTokenMin,
-            amountETHMin
-        );
-        address pair = UniswapV2Library.pairFor(factory, token, WETH);
-        TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
-        IWETH(WETH).deposit{value: amountETH}();
-        assert(IWETH(WETH).transfer(pair, amountETH));
-        liquidity = IUniswapV2Pair(pair).mint(to);
-        // refund dust eth, if any
-        if (msg.value > amountETH) TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
-    }
 
     // **** REMOVE LIQUIDITY ****
     function removeLiquidity(
@@ -119,27 +88,6 @@ contract UniswapV2Router02 is IUniswapV2Router02 {
         require(amountA >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');
         require(amountB >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT');
     }
-    function removeLiquidityETH(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline
-    ) public virtual override ensure(deadline) returns (uint amountToken, uint amountETH) {
-        (amountToken, amountETH) = removeLiquidity(
-            token,
-            WETH,
-            liquidity,
-            amountTokenMin,
-            amountETHMin,
-            address(this),
-            deadline
-        );
-        TransferHelper.safeTransfer(token, to, amountToken);
-        IWETH(WETH).withdraw(amountETH);
-        TransferHelper.safeTransferETH(to, amountETH);
-    }
     function removeLiquidityWithPermit(
         address tokenA,
         address tokenB,
@@ -155,59 +103,6 @@ contract UniswapV2Router02 is IUniswapV2Router02 {
         IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
         (amountA, amountB) = removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);
     }
-    function removeLiquidityETHWithPermit(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline,
-        bool approveMax, uint8 v, bytes32 r, bytes32 s
-    ) external virtual override returns (uint amountToken, uint amountETH) {
-        address pair = UniswapV2Library.pairFor(factory, token, WETH);
-        uint value = approveMax ? uint(-1) : liquidity;
-        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
-        (amountToken, amountETH) = removeLiquidityETH(token, liquidity, amountTokenMin, amountETHMin, to, deadline);
-    }
-
-    // **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
-    function removeLiquidityETHSupportingFeeOnTransferTokens(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline
-    ) public virtual override ensure(deadline) returns (uint amountETH) {
-        (, amountETH) = removeLiquidity(
-            token,
-            WETH,
-            liquidity,
-            amountTokenMin,
-            amountETHMin,
-            address(this),
-            deadline
-        );
-        TransferHelper.safeTransfer(token, to, IERC20Uniswap(token).balanceOf(address(this)));
-        IWETH(WETH).withdraw(amountETH);
-        TransferHelper.safeTransferETH(to, amountETH);
-    }
-    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline,
-        bool approveMax, uint8 v, bytes32 r, bytes32 s
-    ) external virtual override returns (uint amountETH) {
-        address pair = UniswapV2Library.pairFor(factory, token, WETH);
-        uint value = approveMax ? uint(-1) : liquidity;
-        IUniswapV2Pair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
-        amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(
-            token, liquidity, amountTokenMin, amountETHMin, to, deadline
-        );
-    }
 
     // **** SWAP ****
     // requires the initial amount to have already been sent to the first pair
@@ -251,72 +146,6 @@ contract UniswapV2Router02 is IUniswapV2Router02 {
         );
         _swap(amounts, path, to);
     }
-    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
-        external
-        virtual
-        override
-        payable
-        ensure(deadline)
-        returns (uint[] memory amounts)
-    {
-        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
-        amounts = UniswapV2Library.getAmountsOut(factory, msg.value, path);
-        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
-        IWETH(WETH).deposit{value: amounts[0]}();
-        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
-        _swap(amounts, path, to);
-    }
-    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
-        external
-        virtual
-        override
-        ensure(deadline)
-        returns (uint[] memory amounts)
-    {
-        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
-        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
-        require(amounts[0] <= amountInMax, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');
-        TransferHelper.safeTransferFrom(
-            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
-        );
-        _swap(amounts, path, address(this));
-        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
-        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
-    }
-    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
-        external
-        virtual
-        override
-        ensure(deadline)
-        returns (uint[] memory amounts)
-    {
-        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
-        amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
-        require(amounts[amounts.length - 1] >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
-        TransferHelper.safeTransferFrom(
-            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]
-        );
-        _swap(amounts, path, address(this));
-        IWETH(WETH).withdraw(amounts[amounts.length - 1]);
-        TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
-    }
-    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
-        external
-        virtual
-        override
-        payable
-        ensure(deadline)
-        returns (uint[] memory amounts)
-    {
-        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
-        amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
-        require(amounts[0] <= msg.value, 'UniswapV2Router: EXCESSIVE_INPUT_AMOUNT');
-        IWETH(WETH).deposit{value: amounts[0]}();
-        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
-        _swap(amounts, path, to);
-        // refund dust eth, if any
-        if (msg.value > amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
-    }
 
     // **** SWAP (supporting fee-on-transfer tokens) ****
     // requires the initial amount to have already been sent to the first pair
@@ -355,51 +184,6 @@ contract UniswapV2Router02 is IUniswapV2Router02 {
             'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'
         );
     }
-    function swapExactETHForTokensSupportingFeeOnTransferTokens(
-        uint amountOutMin,
-        address[] calldata path,
-        address to,
-        uint deadline
-    )
-        external
-        virtual
-        override
-        payable
-        ensure(deadline)
-    {
-        require(path[0] == WETH, 'UniswapV2Router: INVALID_PATH');
-        uint amountIn = msg.value;
-        IWETH(WETH).deposit{value: amountIn}();
-        assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn));
-        uint balanceBefore = IERC20Uniswap(path[path.length - 1]).balanceOf(to);
-        _swapSupportingFeeOnTransferTokens(path, to);
-        require(
-            IERC20Uniswap(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
-            'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT'
-        );
-    }
-    function swapExactTokensForETHSupportingFeeOnTransferTokens(
-        uint amountIn,
-        uint amountOutMin,
-        address[] calldata path,
-        address to,
-        uint deadline
-    )
-        external
-        virtual
-        override
-        ensure(deadline)
-    {
-        require(path[path.length - 1] == WETH, 'UniswapV2Router: INVALID_PATH');
-        TransferHelper.safeTransferFrom(
-            path[0], msg.sender, UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn
-        );
-        _swapSupportingFeeOnTransferTokens(path, address(this));
-        uint amountOut = IERC20Uniswap(WETH).balanceOf(address(this));
-        require(amountOut >= amountOutMin, 'UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT');
-        IWETH(WETH).withdraw(amountOut);
-        TransferHelper.safeTransferETH(to, amountOut);
-    }
 
     // **** LIBRARY FUNCTIONS ****
     function quote(uint amountA, uint reserveA, uint reserveB) public pure virtual override returns (uint amountB) {
@@ -445,4 +229,13 @@ contract UniswapV2Router02 is IUniswapV2Router02 {
     {
         return UniswapV2Library.getAmountsIn(factory, amountOut, path);
     }
+
+    function pairFor(address tokenA, address tokenB)
+        public
+        view
+        override
+        returns (address)
+    {
+        return UniswapV2Library.pairFor(factory, tokenA, tokenB);
+    }
 }
diff --git a/contracts/uniswapv2/interfaces/IUniswapV2Factory.sol b/contracts/uniswapv2/interfaces/IUniswapV2Factory.sol
index 068250d..02930d7 100644
--- a/contracts/uniswapv2/interfaces/IUniswapV2Factory.sol
+++ b/contracts/uniswapv2/interfaces/IUniswapV2Factory.sol
@@ -7,7 +7,6 @@ interface IUniswapV2Factory {
 
     function feeTo() external view returns (address);
     function feeToSetter() external view returns (address);
-    function migrator() external view returns (address);
 
     function getPair(address tokenA, address tokenB) external view returns (address pair);
     function allPairs(uint) external view returns (address pair);
@@ -17,5 +16,4 @@ interface IUniswapV2Factory {
 
     function setFeeTo(address) external;
     function setFeeToSetter(address) external;
-    function setMigrator(address) external;
 }
diff --git a/contracts/uniswapv2/interfaces/IUniswapV2Router01.sol b/contracts/uniswapv2/interfaces/IUniswapV2Router01.sol
index 0708fef..2e67dcd 100644
--- a/contracts/uniswapv2/interfaces/IUniswapV2Router01.sol
+++ b/contracts/uniswapv2/interfaces/IUniswapV2Router01.sol
@@ -4,7 +4,6 @@ pragma solidity >=0.6.2;
 
 interface IUniswapV2Router01 {
     function factory() external pure returns (address);
-    function WETH() external pure returns (address);
 
     function addLiquidity(
         address tokenA,
@@ -16,14 +15,6 @@ interface IUniswapV2Router01 {
         address to,
         uint deadline
     ) external returns (uint amountA, uint amountB, uint liquidity);
-    function addLiquidityETH(
-        address token,
-        uint amountTokenDesired,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline
-    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
     function removeLiquidity(
         address tokenA,
         address tokenB,
@@ -33,14 +24,6 @@ interface IUniswapV2Router01 {
         address to,
         uint deadline
     ) external returns (uint amountA, uint amountB);
-    function removeLiquidityETH(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline
-    ) external returns (uint amountToken, uint amountETH);
     function removeLiquidityWithPermit(
         address tokenA,
         address tokenB,
@@ -51,15 +34,6 @@ interface IUniswapV2Router01 {
         uint deadline,
         bool approveMax, uint8 v, bytes32 r, bytes32 s
     ) external returns (uint amountA, uint amountB);
-    function removeLiquidityETHWithPermit(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline,
-        bool approveMax, uint8 v, bytes32 r, bytes32 s
-    ) external returns (uint amountToken, uint amountETH);
     function swapExactTokensForTokens(
         uint amountIn,
         uint amountOutMin,
@@ -74,20 +48,6 @@ interface IUniswapV2Router01 {
         address to,
         uint deadline
     ) external returns (uint[] memory amounts);
-    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
-        external
-        payable
-        returns (uint[] memory amounts);
-    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
-        external
-        returns (uint[] memory amounts);
-    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
-        external
-        returns (uint[] memory amounts);
-    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
-        external
-        payable
-        returns (uint[] memory amounts);
 
     function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
     function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
diff --git a/contracts/uniswapv2/interfaces/IUniswapV2Router02.sol b/contracts/uniswapv2/interfaces/IUniswapV2Router02.sol
index 9ce9d8f..a8b6c50 100644
--- a/contracts/uniswapv2/interfaces/IUniswapV2Router02.sol
+++ b/contracts/uniswapv2/interfaces/IUniswapV2Router02.sol
@@ -5,24 +5,6 @@ pragma solidity >=0.6.2;
 import './IUniswapV2Router01.sol';
 
 interface IUniswapV2Router02 is IUniswapV2Router01 {
-    function removeLiquidityETHSupportingFeeOnTransferTokens(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline
-    ) external returns (uint amountETH);
-    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
-        address token,
-        uint liquidity,
-        uint amountTokenMin,
-        uint amountETHMin,
-        address to,
-        uint deadline,
-        bool approveMax, uint8 v, bytes32 r, bytes32 s
-    ) external returns (uint amountETH);
-
     function swapExactTokensForTokensSupportingFeeOnTransferTokens(
         uint amountIn,
         uint amountOutMin,
@@ -30,17 +12,6 @@ interface IUniswapV2Router02 is IUniswapV2Router01 {
         address to,
         uint deadline
     ) external;
-    function swapExactETHForTokensSupportingFeeOnTransferTokens(
-        uint amountOutMin,
-        address[] calldata path,
-        address to,
-        uint deadline
-    ) external payable;
-    function swapExactTokensForETHSupportingFeeOnTransferTokens(
-        uint amountIn,
-        uint amountOutMin,
-        address[] calldata path,
-        address to,
-        uint deadline
-    ) external;
+
+    function pairFor(address tokenA, address tokenB) external view returns (address);
 }
\ No newline at end of file
diff --git a/contracts/uniswapv2/interfaces/IWETH.sol b/contracts/uniswapv2/interfaces/IWETH.sol
deleted file mode 100644
index f06c35b..0000000
--- a/contracts/uniswapv2/interfaces/IWETH.sol
+++ /dev/null
@@ -1,9 +0,0 @@
-// SPDX-License-Identifier: MIT
-
-pragma solidity >=0.5.0;
-
-interface IWETH {
-    function deposit() external payable;
-    function transfer(address to, uint value) external returns (bool);
-    function withdraw(uint) external;
-}
\ No newline at end of file
diff --git a/contracts/uniswapv2/libraries/UniswapV2Library.sol b/contracts/uniswapv2/libraries/UniswapV2Library.sol
index 66dcc4d..0223edd 100644
--- a/contracts/uniswapv2/libraries/UniswapV2Library.sol
+++ b/contracts/uniswapv2/libraries/UniswapV2Library.sol
@@ -23,7 +23,7 @@ library UniswapV2Library {
                 hex'ff',
                 factory,
                 keccak256(abi.encodePacked(token0, token1)),
-                hex'e18a34eb0e04b04f7a0ac29a6e80748dca96319b42c54d679cb821dca90c6303' // init code hash
+                hex'b3b8ff62960acea3a88039ebcf80699f15786f1b17cebd82802f7375827a339c' // init code hash from UniswapV2Factory.pairCodeHash()
             ))));
     }