<===> input.scss
a {
  b: {
    @error test;
    c: d;
  }
}

<===> error
Error: Illegal nesting: Only properties may be nested beneath properties.
        on line 3 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: test
  ,
3 |     @error test;
  |     ^^^^^^^^^^^
  '
  input.scss 3:5  root stylesheet