Hey guys I found a bug in the compiler

[ArmeniaH]

Assume this scss code

.class1, .class2 {
div:not(.last) {
background:red;
}
}

After compiling I get

.class1 div:not(.last, .last), .class2 div:not(.last, .last) {
background: red;
}

---

another example

.class1, .class2, .class3, .class4 {
div:not(.last) {
background:red;
}
}

.class1 div:not(.last, .last, .last, .last), .class2 div:not(.last, .last, .last, .last), .class3 div:not(.last, .last, .last, .last), .class4 div:not(.last, .last, .last, .last) {
background: red;
}

As you can see the .last class is getting duplicated by the number of global class counts.

[rodneyrehm]

I took the liberty of formatting your code examples.

The issue is already known and tracked at sass/libsass#1901. There is nothing sass.js can do about errors in libsass itself. Closing this issue because of upstream problem.