<===> _alpha.scss
@import 'beta';

<===> _beta.scss
@import 'alpha';

<===> input.scss
@import 'alpha';

<===> error
Error: An @import loop has been found:
           input.scss imports _alpha.scss
           _alpha.scss imports _beta.scss
           _beta.scss imports _alpha.scss
        on line 1 of _beta.scss
        from line 1 of _alpha.scss
        from line 1 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: This file is already being loaded.
  ,--> _beta.scss
1 | @import 'alpha';
  |         ^^^^^^^ new load
  '
  ,--> input.scss
1 | @import 'alpha';
  |         ======= original load
  '
  _beta.scss 1:9   @import
  _alpha.scss 1:9  @import
  input.scss 1:9   root stylesheet