Memory error when defining custom help command

[Dialga]

Describe the bug

A runtime memory error occurs when defining a custom help command.

Expected Behavior

No memory error.

Current Behavior

$ v run issue.v
RUNTIME ERROR: invalid memory access

Reproduction Steps

import cli { Command, Flag }
fn main() {
        mut cmd := Command{
                name: 'help'
                commands: [
                        Command{
                                name: 'help'
                        }
                ]
        }
        cmd.parse([''])
}

Possible Solution

No response

Additional Information/Context

No response

V version

latest git

Environment details (OS name and version, etc.)

Arch Linux x64