& doesn't work properly when pseudo class wrapped by @at-root.

[kryvonos-v]

I've got the following code:

.tooltip {
  &__arrow {
    @at-root .tooltip--arrow-down .tooltip__arrow {
      &:before {
        @debug #{&};
      }
    }
  }
}

Expected that the code about will output to console:
.tooltip--arrow-down .tooltip__arrow:before
But I get:
.tooltip--arrow-down .tooltip__arrow .tooltip--arrow-down .tooltip__arrow:before.

I've tried to compile that code with Ruby Sass and everything works as expected. I guess that the bug comes from LibSass, but I don't really sure about it.

• node-sass 4.7.1

[nschonni]

Yes, as mentioned in the issue template, compilation issues should be filed upstream. If you open an issue there you can link it back here.

[xzyfer]

Fixed in 4.8.0