// vtest vflags: -prod
import os

struct Process {
    path string
    argv []string
    dir  string
}

struct Command {
    path string
    args []string
    dir  string
mut:
    process &Process = unsafe { nil }
}

fn lookup(cmd string) !string {
    return os.find_abs_path_of_executable(cmd)!
}

fn build(mut c Command) ! {
    if !isnil(c.process) {
        return error('reuse')
    }
    c.process = &Process{
        path: lookup(c.path)!
        argv: c.args
        dir:  c.dir
    }
}

fn main() {
    mut cmd := Command{
        path: 'bash'
        args: ['-c', 'echo ok']
    }
    build(mut cmd) or { panic(err) }
}