<===> input.scss
a {
  display: block

  b {
    c {
      foo: bar;
    }
  }
}

<===> error
Error: Illegal nesting: Only properties may be nested beneath properties.
        on line 5 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: expected ":".
  ,
5 |     c {
  |       ^
  '
  input.scss 5:7  root stylesheet