swc/crates/swc_css_parser/tests/fixture/at-rule/nest/input.css

.foo {
    color: red;
    @nest & > .bar {
        color: blue;
    }
}

.foo {
    color: red;
    @nest .parent & {
        color: blue;
    }
}

.foo {
    color: red;
    @nest :not(&) {
        color: blue;
    }
}

.foo {
    color: blue;

    @nest .bar & {
        color: red;
        &.baz {
            color: green;
        }
    }
}