Rendering differences with node-sass 3.3 and 3.4

[gmhenderson]

Consider:

@include component (module) {
    @include option(big) {
        @include part(part) {
            color: red;
        }
    }
}

With node-sass 3.3.3 the output (as I would expect) is:

.module.\--big .module__part {
  color: red; }

With node-sass 3.4.1 the output is:

.module.\--big__part {
  color: red; }

Is this a bug or an expected change? If the latter, how would I achieve the output of the first example?

[gmhenderson]

bump.

[omichelsen]

Just hit the same problem going from ruby sass 3.4.19 to node-sass.

The problem is this line:

$optionIndex: str-index(#{&}, "." + $csstyle-option-symbol);

Because #{&} is interpolated it outputs .-- instead of .\-- and will never match $csstyle-option-symbol. Not sure how to fix this one except maybe checking for .-- which will probably not work in all cases?