Parse error

pragma solidity ^0.5.11;
pragma experimental ABIEncoderV2;

contract ItemDefiner {
    struct Item {
        bool isGood;
    }
}

contract ValidItemChecker {
    function checkIfIsGood(bytes memory itemBytes) public pure returns (bool) {
        // This function shows valid solidity (which compiles) that is also successfully
        // parsed.
        ItemDefiner.Item memory item = abi.decode(itemBytes, (ItemDefiner.Item));
        return item.isGood;
    }
    function checkIfArePlentiful(bytes memory itemsBytes) public pure returns (bool) {
        // The following line is correct code.
        // This contract will compile, but the parser fails to parse it.
        ItemDefiner.Item[] memory items = abi.decode(itemsBytes, (ItemDefiner.Item[]));
        return items.length > 5;
    }
}

contract InvalidItemChecker {
    function checkIfIsGood(bytes memory itemBytes) public pure returns (bool) {
        ItemDefiner.Item memory item = abi.decode(itemBytes, (ItemDefiner.Item));
        return item.isGood;
    }
    function checkIfArePlentiful(bytes memory itemsBytes) public pure returns (bool) {
        // The following line is incorrect code: abi.decode will try to assign
        // a value of type ItemDefiner.Item to a variable of type ItemDefiner.Item[]
        // This contract will not compile, but the parser parses it as valid code.
        ItemDefiner.Item[] memory items = abi.decode(itemsBytes, (ItemDefiner.Item));
        return items.length > 5;
    }
}