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SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.1)
// ----

@mixin specify($selector) {
  @at-root { 
    #{selector-append($selector, &)} {
      @content;
    }
  }
}

.button {
  border: none;
  
  // Qualify `.button` with `button`
  @include specify(button) {
    -webkit-appearance: none;
  }
  
  // Qualify `.button` with `a`
  @include specify(a) {
    text-decoration: none;
  }
}

SassMeister-output.css

Invalid CSS after "...end($selector, ": expected function argument, was "&)} {"