module private_mutability

pub struct Counter {
mut:
    hidden int
pub:
    label string
}

fn increment_hidden(mut counter Counter) {
    counter.hidden++
}

fn (mut counter Counter) bump_hidden() {
    counter.hidden++
}

pub fn (mut counter Counter) bump_hidden_via_method() {
    counter.bump_hidden()
}

pub fn (mut counter Counter) bump_hidden_via_helper() {
    increment_hidden(mut counter)
}

pub fn (counter Counter) label_text() string {
    return counter.label
}