Cast interface generates non-compiling code for struct return type.

[ckoopmann]

Component

Cast

Have you ensured that all of these are up to date?

• [X] Foundry
• [X] Foundryup

What version of Foundry are you on?

0.2.0 (56dc746 2022-08-26T00:07:43.474069Z)

What command(s) is the bug in?

cast interface

Operating System

macOS (Intel)

Describe the bug

Summary

When encountering functions with an array of structs as a return type, cast --interface generates solidity code that does not compile.

Example

For the following input code

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

contract ExampleContract
{
    struct NFT {
        address tokenContract;
        uint256 tokenId;
    }

    NFT[] nfts;

    function getNfts() public view returns (NFT[] memory) {
        return nfts;
    }
}

cast generates the following interface (when run against the json abi obtained from above source code via forge build):

pragma solidity ^0.8.15;

interface Interface {
    function getNfts() external view returns ((address, uint256)[] memory);
}

which triggers the following error when trying to compile with forge build:

Compiler run failed
error[3546]: ParserError: Expected type name
 --> src/ExampleGeneratedInterface.sol:4:47:
  |
4 |     function getNfts() external view returns ((address, uint256)[] memory);
  |                                               ^

[mattsse]

right, tuples are not proper types, we should support structs here as well

[ckoopmann]

Seems to be fixed (according to manual tests on commit 8fd5930c74d352bb8e8c7dffc3e7fd7839ecb535 )