Ampersand glued to the selector should be rejected

[saper]

This is from sass/node-sass#1324:

.btn {
    .open& {
        color: #000;
    }
}

as of https://github.com/sass/libsass/tree/13ae62def291c4934ad04d0d527e84b4021d60a3 produces:

.open& {
  color: #000; }

and this is rejected by Ruby Sass.

(I hope this is not a duplicate, the closest match I could find was #1491)

[saper]

This should be the proper behaviour as of Sass 4.0 per sass/sass#1425

[xzyfer]

We'll leave this for the time being to see what happens with this in Ruby Sass.

[arkonan]

If sass/sass#1425 is trying to match LESS's behavior I would expect

.btn {
    .open& {
        color: #000;
    }
}

to produce

.open.btn {
  color: #000;
}

(rather than output the & into the CSS)

[xzyfer]

sass/sass#1425 is the correct place for that discussion.