<===> input.scss
@function c() {
  @error test;
  @return d;
}

a {
  b: {
    c: c();
  }
}

<===> error
Error: test
        on line 2 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: test
  ,
8 |     c: c();
  |        ^^^
  '
  input.scss 8:8  root stylesheet