Example (HRX)

<==> input.scss
.foo {
  @import 'upstream';
}

<==> upstream.scss
@use 'other';

@mixin a() {
  b: c;
}

@include a;

<==> _other.scss
// empty, it doesn't matter

This crashes because evaluate.dart checks for the declaration's "parent's parent". And I guess the reference isn't there.

Interestingly, this doesn't crash if we...:

• remove the @use rule
• replace @use for a built-in module like @use 'sass:math'
• wrap @include a with &{}
• remove the wrapping rule .foo{} (it does fail because the delcarataion ends up without a container, but it at least it doesn't crash)