error[E0599]: the function or associated item `from_repr` exists for struct `EnumSet<OkayEnumButCantUseFromRepr>`, but its trait bounds were not satisfied
  --> tests/compile-fail/explicit_repr.rs:15:44
   |
4  | enum OkayEnumButCantUseFromRepr {
   | -------------------------------
   | |
   | doesn't satisfy `<_ as EnumSetTypePrivate>::Repr = <OkayEnumButCantUseFromRepr as EnumSetTypeWithRepr>::Repr`
   | doesn't satisfy `OkayEnumButCantUseFromRepr: EnumSetTypeWithRepr`
...
15 |     EnumSet::<OkayEnumButCantUseFromRepr>::from_repr(1);
   |                                            ^^^^^^^^^ function or associated item cannot be called on `EnumSet<OkayEnumButCantUseFromRepr>` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `OkayEnumButCantUseFromRepr: EnumSetTypeWithRepr`
           `<OkayEnumButCantUseFromRepr as EnumSetTypePrivate>::Repr = <OkayEnumButCantUseFromRepr as EnumSetTypeWithRepr>::Repr`
           which is required by `OkayEnumButCantUseFromRepr: EnumSetTypeWithRepr`
note: the trait `EnumSetTypeWithRepr` must be implemented
  --> src/traits.rs
   |
   | / pub unsafe trait EnumSetTypeWithRepr:
   | |     EnumSetType + EnumSetTypePrivate<Repr = <Self as EnumSetTypeWithRepr>::Repr>
   | |________________________________________________________________________________^

error[E0599]: the function or associated item `from_repr` exists for struct `EnumSet<OkayEnumButCantUseFromReprArray>`, but its trait bounds were not satisfied
  --> tests/compile-fail/explicit_repr.rs:16:49
   |
10 | enum OkayEnumButCantUseFromReprArray {
   | ------------------------------------
   | |
   | doesn't satisfy `<_ as EnumSetTypePrivate>::Repr = <OkayEnumButCantUseFromReprArray as EnumSetTypeWithRepr>::Repr`
   | doesn't satisfy `_: EnumSetTypeWithRepr`
...
16 |     EnumSet::<OkayEnumButCantUseFromReprArray>::from_repr([1]);
   |                                                 ^^^^^^^^^ function or associated item cannot be called on `EnumSet<OkayEnumButCantUseFromReprArray>` due to unsatisfied trait bounds
   |
   = note: the following trait bounds were not satisfied:
           `OkayEnumButCantUseFromReprArray: EnumSetTypeWithRepr`
           `<OkayEnumButCantUseFromReprArray as EnumSetTypePrivate>::Repr = <OkayEnumButCantUseFromReprArray as EnumSetTypeWithRepr>::Repr`
           which is required by `OkayEnumButCantUseFromReprArray: EnumSetTypeWithRepr`
note: the trait `EnumSetTypeWithRepr` must be implemented
  --> src/traits.rs
   |
   | / pub unsafe trait EnumSetTypeWithRepr:
   | |     EnumSetType + EnumSetTypePrivate<Repr = <Self as EnumSetTypeWithRepr>::Repr>
   | |________________________________________________________________________________^