issue-abusing-variable-redefinition-counter-2.less

// implementation:

.counter() {
    .counter-redefine();
    .counter-wrapper((@counter + 1));
}

.counter-wrapper(@new: 0) {
    .counter-redefine() {
        @counter: @new;
    }
} .counter-wrapper();

// usage:

a {
    .counter();
    counter: @counter;
}

b {
    .counter();
    counter: @counter;
}

c {
    .counter();
    counter: @counter;
}

d {
    .counter();
    counter: @counter;
}

See less/less.js#1678