Foundation Drop contest - 0xackermann's results

Returned Parameter Is Not Found

Location

NFTDropCollection#L303

Impact

Should not affect much since there is return in the function.

Proof of concept

Let us look at the function tokenURI:

function tokenURI(uint256 tokenId) public view override returns (string memory uri) {
  _requireMinted(tokenId);

  return string.concat(baseURI, tokenId.toString(), ".json");
}

Return parameter is declared but the variable is not found. uri is declared as returned parameter but no uri variable is found.

How to fix

Use assignment instead of return

uri = string.concat(baseURI, tokenId.toString(), ".json");