If the entrypoint imports a file that uses variables that were originally defined in the entrypoint, the migrator generates a @use that imports the original file. For example:

// entrypoint.scss
$var: value;

@import "other";

// _other.scss
@debug $var;

is migrated to:

// entrypoint.scss
$var: value;

@use "other";

// _other.scss
@use "entrypoint";
@debug entrypoint.$var;

This is invalid, as it creates a dependency loop. Since it's not totally clear what the user intended, the migrator should probably error out.