src/test/ui/issues/issue-35677.stderr

   1 error[E0599]: no method named `is_subset` found for reference `&HashSet<T>` in the current scope
   2   --> $DIR/issue-35677.rs:4:10
   3    |
   4 LL |     this.is_subset(other)
   5    |          ^^^^^^^^^ method not found in `&HashSet<T>`
   6    |
   7    = note: the method `is_subset` exists but the following trait bounds were not satisfied:
   8            `T: Eq`
   9            `T: Hash`
  10
  11 error: aborting due to previous error
  12
  13 For more information about this error, try `rustc --explain E0599`.