ERC1155

contracts/token/ERC1155/ERC1155.sol

@@ -53,7 +53,7 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
      * Clients calling this function must replace the `\{id\}` substring with the
      * actual token type ID.
      */
-    function uri(uint256) public view virtual override returns (string memory) {
+    function uri(uint256) public view virtual returns (string memory) {
         return _uri;
     }
 
@@ -64,7 +64,7 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
      *
      * - `account` cannot be the zero address.
      */
-    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
+    function balanceOf(address account, uint256 id) public view virtual returns (uint256) {
         return _balances[id][account];
     }
 
@@ -78,7 +78,7 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
     function balanceOfBatch(
         address[] memory accounts,
         uint256[] memory ids
-    ) public view virtual override returns (uint256[] memory) {
+    ) public view virtual returns (uint256[] memory) {
         require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");
 
         uint256[] memory batchBalances = new uint256[](accounts.length);
@@ -93,27 +93,21 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
     /**
      * @dev See {IERC1155-setApprovalForAll}.
      */
-    function setApprovalForAll(address operator, bool approved) public virtual override {
+    function setApprovalForAll(address operator, bool approved) public virtual {
         _setApprovalForAll(_msgSender(), operator, approved);
     }
 
     /**
      * @dev See {IERC1155-isApprovedForAll}.
      */
-    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
+    function isApprovedForAll(address account, address operator) public view virtual returns (bool) {
         return _operatorApprovals[account][operator];
     }
 
     /**
      * @dev See {IERC1155-safeTransferFrom}.
      */
-    function safeTransferFrom(
-        address from,
-        address to,
-        uint256 id,
-        uint256 amount,
-        bytes memory data
-    ) public virtual override {
+    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes memory data) public virtual {
         require(
             from == _msgSender() || isApprovedForAll(from, _msgSender()),
             "ERC1155: caller is not token owner or approved"
@@ -130,7 +124,7 @@ contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
         uint256[] memory ids,
         uint256[] memory amounts,
         bytes memory data
-    ) public virtual override {
+    ) public virtual {
         require(
             from == _msgSender() || isApprovedForAll(from, _msgSender()),
             "ERC1155: caller is not token owner or approved"

contracts/token/common/ERC2981.sol

@@ -40,7 +40,7 @@ abstract contract ERC2981 is IERC2981, ERC165 {
     /**
      * @inheritdoc IERC2981
      */
-    function royaltyInfo(uint256 tokenId, uint256 salePrice) public view virtual  returns (address, uint256) {
+    function royaltyInfo(uint256 tokenId, uint256 salePrice) public view virtual returns (address, uint256) {
         RoyaltyInfo memory royalty = _tokenRoyaltyInfo[tokenId];
 
         if (royalty.receiver == address(0)) {