Troubles with optional type decoding

[medved239]

I'm trying to compile the following program

pragma ton-solidity ^0.44.0;

contract Mem {
    constructor() public {
        tvm.accept();
    }

    function test() internal returns (optional(uint256)) {
        TvmSlice data = msg.data;
        return data.decode(optional(uint256));
    }
}

and getting compilation Error: Return argument type optional(optional(uint256)) is not implicitly convertible to expected type (type of first return variable) optional(uint256).
So the type checker for some reason thinks that expression data.decode(optional(uint256)) has type optional(optional(uint256)).

And when compiling this code

pragma ton-solidity ^0.44.0;

contract Mem {
    constructor() public {
        tvm.accept();
    }

    struct Struct {
        optional(uint256) value;
    }

    function test() internal returns (Struct) {
        TvmSlice data = msg.data;
        return data.decode(Struct);
    }
}

I get "Unsupported parameter type for decoding: optional(uint256)". So optional type seems to be TvmBuilder.store'able, but not TvmSlice.decode'able, and that is pretty not convenient.

I hope you will support decoding optional types in a next release.

[IgorKoval]

Thank you! We will fix this in next release!