interface WalkerTalker {
    // Abc
    Walker // adsas
    // zxczxc
    Talker // xyzdef
    // asdasdas
    nspeeches int
}

interface Talker {
    nspeeches int
mut:
    talk(msg string)
}

interface Walker {
    nsteps int
mut:
    walk(newx int, newy int)
}

struct Abc {
mut:
    x         int
    y         int
    phrases   []string
    nsteps    int = 1000
    nspeeches int = 1000
}

fn (mut s Abc) talk(msg string) {
    s.phrases << msg
    s.nspeeches++
}

fn (mut s Abc) walk(x int, y int) {
    s.x = x
    s.y = y
    s.nsteps++
}

fn test_walker_talker() {
    mut wt := WalkerTalker(Abc{
        x:       1
        y:       1
        phrases: ['hi']
    })
    wt.talk('my name is Wally')
    wt.walk(100, 100)
    if mut wt is Abc {
        dump(wt)
        assert wt.x == 100
        assert wt.y == 100
        assert wt.phrases.last().ends_with('Wally')
        assert wt.nspeeches == 1001
        assert wt.nsteps == 1001
    }
}