<===> input.scss
test {
  pre& {
    foo {
      bar: baz;
    }
  }
}
<===> error
Error: Invalid CSS after "pre": expected "{", was "&"
       
       "&" may only be used at the beginning of a compound selector.
        on line 2 of /sass/spec/libsass/base-level-parent/nested/prefix/input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: "&" may only used at the beginning of a compound selector.
  ,
2 |   pre&{
  |      ^
  '
  input.scss 2:6  root stylesheet