error[E0277]: the trait bound `(): _Contains<&C>` is not satisfied
  --> $DIR/issue-85848.rs:24:29
   |
LL |     writes_to_specific_path(&cap);
   |     ----------------------- ^^^^ the trait `_Contains<&C>` is not implemented for `()`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `Delegates<U>` is implemented for `T`
note: required for `&C` to implement `Contains<(), true>`
  --> $DIR/issue-85848.rs:21:12
   |
LL | impl<T, U> Contains<T, { contains::<T, U>() }> for U where T: _Contains<U> {}
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^
note: required for `&C` to implement `Delegates<()>`
  --> $DIR/issue-85848.rs:12:12
   |
LL | impl<T, U> Delegates<U> for T where T: Contains<U, true> {}
   |            ^^^^^^^^^^^^     ^
note: required by a bound in `writes_to_specific_path`
  --> $DIR/issue-85848.rs:30:31
   |
LL | fn writes_to_specific_path<C: Delegates<()>>(cap: &C) {}
   |                               ^^^^^^^^^^^^^ required by this bound in `writes_to_specific_path`

error: unconstrained generic constant
  --> $DIR/issue-85848.rs:24:29
   |
LL |     writes_to_specific_path(&cap);
   |     ----------------------- ^^^^
   |     |
   |     required by a bound introduced by this call
   |
   = help: try adding a `where` bound using this expression: `where [(); { contains::<T, U>() }]:`
note: required for `&C` to implement `Contains<(), true>`
  --> $DIR/issue-85848.rs:21:12
   |
LL | impl<T, U> Contains<T, { contains::<T, U>() }> for U where T: _Contains<U> {}
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ^
note: required for `&C` to implement `Delegates<()>`
  --> $DIR/issue-85848.rs:12:12
   |
LL | impl<T, U> Delegates<U> for T where T: Contains<U, true> {}
   |            ^^^^^^^^^^^^     ^
note: required by a bound in `writes_to_specific_path`
  --> $DIR/issue-85848.rs:30:31
   |
LL | fn writes_to_specific_path<C: Delegates<()>>(cap: &C) {}
   |                               ^^^^^^^^^^^^^ required by this bound in `writes_to_specific_path`

error[E0308]: mismatched types
  --> $DIR/issue-85848.rs:24:5
   |
LL |     writes_to_specific_path(&cap);
   |     ^^^^^^^^^^^^^^^^^^^^^^^ expected `true`, found `{ contains::<T, U>() }`
   |
   = note: expected type `true`
              found type `{ contains::<T, U>() }`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0277, E0308.
For more information about an error, try `rustc --explain E0277`.