<===> _susy.scss
@import 'susy';

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

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

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