Can I use the ampersand in SASS to reference specific tags with the parent class? [duplicate]

On Sass 3.4:

.semantic {
    @at-root {
      ul#{&} {
        padding: 0;
        margin: 0;
      }
      p#{&} {
        margin: 0;
      }
    }
}

Generates:

ul.semantic {
  padding: 0;
  margin: 0;
}

p.semantic {
  margin: 0;
}

@at-root moves the block to the top-level. This has several uses (see link) but here it's being used to keep take advantage of the & syntax without implying that the rules are child selectors of .semantic.

What you're wanting for would in theory look like this:

.semantic {
    ul& {
        padding: 0;
        margin: 0;
    }
    p& {
        margin: 0;
    }
}

This is not possible because the & must be first. You're just going to have to deal with the fact that it isn't DRY and write it out by hand:

ul.semantic {
    padding: 0;
    margin: 0;
}

p.semantic {
    margin: 0;
}

As of Sass 3.3 or 3.4, it is possible using this syntax:

.semantic {
    ul#{&} {
        padding: 0;
        margin: 0;
    }
    p#{&} {
        margin: 0;
    }
}