Unable publish source code with solidity version >= 0.8.0 with some imports

[maxsiz]

Environment information

• brownie Version: 1.16.2
• ganache-cli Version: 0.8.4
• solc Version: 0.8.7
• Python Version: 3.6.9
• OS: linux-mint

What was wrong?

Example contract:

// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

import "OpenZeppelin/openzeppelin-contracts@4.3.1/contracts/token/ERC721/ERC721.sol";

contract TestImport is ERC721 {

    constructor(string memory name_,
        string memory symbol_) ERC721(name_, symbol_)  {
    }

    
    function mint() external {
        require(balanceOf(msg.sender) == 0, "Only one");
        _mint(msg.sender, block.number);
    }
    
}

TestImport.get_verification_info() fail:

~/projects/temp/erc721$ brownie console
Brownie v1.16.2 - Python development framework for Ethereum

Compiling contracts...
  Solc version: 0.8.7
  Optimizer: Enabled  Runs: 200
  EVM Version: Istanbul
Generating build data...
 - OpenZeppelin/openzeppelin-contracts@4.3.1/ERC721
 - OpenZeppelin/openzeppelin-contracts@4.3.1/IERC721
 - OpenZeppelin/openzeppelin-contracts@4.3.1/IERC721Receiver
 - OpenZeppelin/openzeppelin-contracts@4.3.1/IERC721Metadata
 - OpenZeppelin/openzeppelin-contracts@4.3.1/Address
 - OpenZeppelin/openzeppelin-contracts@4.3.1/Context
 - OpenZeppelin/openzeppelin-contracts@4.3.1/Strings
 - OpenZeppelin/openzeppelin-contracts@4.3.1/ERC165
 - OpenZeppelin/openzeppelin-contracts@4.3.1/IERC165
 - TestImport

ErcProject is the active project.

Launching 'ganache-cli --accounts 10 --hardfork istanbul --gasLimit 12000000 --mnemonic brownie --port 8545'...
Brownie environment is ready.
>>> TestImport.get_verification_info()
  File "<console>", line 1, in <module>
  File "brownie/network/contract.py", line 315, in get_verification_info
    build_json = self._project._build.get(name)
  File "brownie/project/build.py", line 124, in get
    return self._interfaces[key]
KeyError: 'OpenZeppelin/openzeppelin-contracts@4.3.1/IERC721Receiver'
>>> interface.
  File "<console>", line 1,
    interface.
              ^
SyntaxError: invalid syntax

So I can compile and deploy this contract and it's work well. But I can't publish source.
When I use olidity >=0.6.0 <0.8.0; and /openzeppelin-contracts@3.4.0 - all is OK And TestImport.get_verification_info() work well

I think that problem is occur when we use import from package files that include import directives with not inherited code. Let's look at OpenZeppelin ERC721.sol:
https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol
We can notice that IERC721Receiver is not ininheriting but still used in contract code:

...
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
...
 function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else   ##{
            return true;
        }
    }
....

Assume that issue #1114 was part of this problem.

Console screenshot
http://i.imgur.com/wAVKnRx.png

[ImportNN]

I am having the same error. I believe problem comes from importing contracts. Tried deploying simple contracts with no imports and worked with no probs.

[rodriguesmvinicius]

I am still having this issue even with brownie 1.18

[SolomanDev]

How do I convert uint256 type to address type in Solidity?
Thank you if very for letting me know.