Redudant space in interpolated selectors like nth(...)

[seven-phases-max]

Example:

@i: 3;

ul li:nth-child(@{i}) {
    color: red;
}

ul {
    li:nth-child(@{i}) {
        background: red;
    }
}

Expected output:

ul li:nth-child(3) {
  color: red;
}
ul li:nth-child(3) {
  background: red;
}

Actual output:

ul li:nth-child(3) {
  color: red;
}
ul li:nth-child( 3) {
  background: red;
}

Tested v1.7.0 (but this seems to be introduced in v1.5.0).

[seven-phases-max]

Closing as fixed in v2.