error[E0277]: `Cell<()>` cannot be shared between threads safely
  --> $DIR/suggest-cell.rs:12:20
   |
LL |     require_sync::<std::cell::Cell<()>>();
   |                    ^^^^^^^^^^^^^^^^^^^ `Cell<()>` cannot be shared between threads safely
   |
   = help: the trait `Sync` is not implemented for `Cell<()>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock`
note: required by a bound in `require_sync`
  --> $DIR/suggest-cell.rs:1:20
   |
LL | fn require_sync<T: Sync>() {}
   |                    ^^^^ required by this bound in `require_sync`

error[E0277]: `Cell<u8>` cannot be shared between threads safely
  --> $DIR/suggest-cell.rs:17:20
   |
LL |     require_sync::<std::cell::Cell<u8>>();
   |                    ^^^^^^^^^^^^^^^^^^^ `Cell<u8>` cannot be shared between threads safely
   |
   = help: the trait `Sync` is not implemented for `Cell<u8>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicU8` instead
note: required by a bound in `require_sync`
  --> $DIR/suggest-cell.rs:1:20
   |
LL | fn require_sync<T: Sync>() {}
   |                    ^^^^ required by this bound in `require_sync`

error[E0277]: `Cell<i32>` cannot be shared between threads safely
  --> $DIR/suggest-cell.rs:22:20
   |
LL |     require_sync::<std::cell::Cell<i32>>();
   |                    ^^^^^^^^^^^^^^^^^^^^ `Cell<i32>` cannot be shared between threads safely
   |
   = help: the trait `Sync` is not implemented for `Cell<i32>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicI32` instead
note: required by a bound in `require_sync`
  --> $DIR/suggest-cell.rs:1:20
   |
LL | fn require_sync<T: Sync>() {}
   |                    ^^^^ required by this bound in `require_sync`

error[E0277]: `Cell<bool>` cannot be shared between threads safely
  --> $DIR/suggest-cell.rs:27:20
   |
LL |     require_sync::<std::cell::Cell<bool>>();
   |                    ^^^^^^^^^^^^^^^^^^^^^ `Cell<bool>` cannot be shared between threads safely
   |
   = help: the trait `Sync` is not implemented for `Cell<bool>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` or `std::sync::atomic::AtomicBool` instead
note: required by a bound in `require_sync`
  --> $DIR/suggest-cell.rs:1:20
   |
LL | fn require_sync<T: Sync>() {}
   |                    ^^^^ required by this bound in `require_sync`

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0277`.