error[E0277]: `Cell<util::alternating_cell::State>` cannot be shared between threads safely
  --> tests/ui/simvalue_is_not_internable.rs:11:26
   |
11 | fn f(v: SimValue<()>) -> Interned<SimValue<()>> {
   |                          ^^^^^^^^^^^^^^^^^^^^^^ `Cell<util::alternating_cell::State>` cannot be shared between threads safely
   |
   = help: within `SimValue<()>`, the trait `Sync` is not implemented for `Cell<util::alternating_cell::State>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock`
note: required because it appears within the type `util::alternating_cell::AlternatingCell<value::SimValueInner<()>>`
  --> src/util/alternating_cell.rs
   |
   | pub(crate) struct AlternatingCell<T: ?Sized> {
   |                   ^^^^^^^^^^^^^^^
note: required because it appears within the type `SimValue<()>`
  --> src/sim/value.rs
   |
   | pub struct SimValue<T: Type> {
   |            ^^^^^^^^
note: required by a bound in `fayalite::intern::Interned`
  --> src/intern.rs
   |
   | pub struct Interned<T: ?Sized + 'static + Send + Sync> {
   |                                                  ^^^^ required by this bound in `Interned`

error[E0277]: `UnsafeCell<value::SimValueInner<()>>` cannot be shared between threads safely
  --> tests/ui/simvalue_is_not_internable.rs:11:26
   |
11 | fn f(v: SimValue<()>) -> Interned<SimValue<()>> {
   |                          ^^^^^^^^^^^^^^^^^^^^^^ `UnsafeCell<value::SimValueInner<()>>` cannot be shared between threads safely
   |
   = help: within `SimValue<()>`, the trait `Sync` is not implemented for `UnsafeCell<value::SimValueInner<()>>`
note: required because it appears within the type `util::alternating_cell::AlternatingCell<value::SimValueInner<()>>`
  --> src/util/alternating_cell.rs
   |
   | pub(crate) struct AlternatingCell<T: ?Sized> {
   |                   ^^^^^^^^^^^^^^^
note: required because it appears within the type `SimValue<()>`
  --> src/sim/value.rs
   |
   | pub struct SimValue<T: Type> {
   |            ^^^^^^^^
note: required by a bound in `fayalite::intern::Interned`
  --> src/intern.rs
   |
   | pub struct Interned<T: ?Sized + 'static + Send + Sync> {
   |                                                  ^^^^ required by this bound in `Interned`

error[E0277]: the trait bound `SimValue<()>: Intern` is not satisfied
  --> tests/ui/simvalue_is_not_internable.rs:12:26
   |
12 |     Intern::intern_sized(v)
   |     -------------------- ^ the trait `Hash` is not implemented for `SimValue<()>`
   |     |
   |     required by a bound introduced by this call
   |
   = note: required for `SimValue<()>` to implement `Intern`
help: consider dereferencing here
   |
12 |     Intern::intern_sized(*v)
   |                          +

error[E0277]: the trait bound `SimValue<()>: Intern` is not satisfied
  --> tests/ui/simvalue_is_not_internable.rs:12:26
   |
12 |     Intern::intern_sized(v)
   |     -------------------- ^ the trait `std::cmp::Eq` is not implemented for `SimValue<()>`
   |     |
   |     required by a bound introduced by this call
   |
   = note: required for `SimValue<()>` to implement `Intern`
help: consider dereferencing here
   |
12 |     Intern::intern_sized(*v)
   |                          +

error[E0277]: `Cell<util::alternating_cell::State>` cannot be shared between threads safely
  --> tests/ui/simvalue_is_not_internable.rs:12:26
   |
12 |     Intern::intern_sized(v)
   |     -------------------- ^ `Cell<util::alternating_cell::State>` cannot be shared between threads safely
   |     |
   |     required by a bound introduced by this call
   |
   = help: within `SimValue<()>`, the trait `Sync` is not implemented for `Cell<util::alternating_cell::State>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock`
note: required because it appears within the type `util::alternating_cell::AlternatingCell<value::SimValueInner<()>>`
  --> src/util/alternating_cell.rs
   |
   | pub(crate) struct AlternatingCell<T: ?Sized> {
   |                   ^^^^^^^^^^^^^^^
note: required because it appears within the type `SimValue<()>`
  --> src/sim/value.rs
   |
   | pub struct SimValue<T: Type> {
   |            ^^^^^^^^
note: required by a bound in `intern_sized`
  --> src/intern.rs
   |
   | pub trait Intern: Any + Send + Sync {
   |                                ^^^^ required by this bound in `Intern::intern_sized`
   |     fn intern(&self) -> Interned<Self>;
   |     fn intern_sized(self) -> Interned<Self>
   |        ------------ required by a bound in this associated function
help: consider dereferencing here
   |
12 |     Intern::intern_sized(*v)
   |                          +

error[E0277]: `UnsafeCell<value::SimValueInner<()>>` cannot be shared between threads safely
  --> tests/ui/simvalue_is_not_internable.rs:12:26
   |
12 |     Intern::intern_sized(v)
   |     -------------------- ^ `UnsafeCell<value::SimValueInner<()>>` cannot be shared between threads safely
   |     |
   |     required by a bound introduced by this call
   |
   = help: within `SimValue<()>`, the trait `Sync` is not implemented for `UnsafeCell<value::SimValueInner<()>>`
note: required because it appears within the type `util::alternating_cell::AlternatingCell<value::SimValueInner<()>>`
  --> src/util/alternating_cell.rs
   |
   | pub(crate) struct AlternatingCell<T: ?Sized> {
   |                   ^^^^^^^^^^^^^^^
note: required because it appears within the type `SimValue<()>`
  --> src/sim/value.rs
   |
   | pub struct SimValue<T: Type> {
   |            ^^^^^^^^
note: required by a bound in `intern_sized`
  --> src/intern.rs
   |
   | pub trait Intern: Any + Send + Sync {
   |                                ^^^^ required by this bound in `Intern::intern_sized`
   |     fn intern(&self) -> Interned<Self>;
   |     fn intern_sized(self) -> Interned<Self>
   |        ------------ required by a bound in this associated function
help: consider dereferencing here
   |
12 |     Intern::intern_sized(*v)
   |                          +

error[E0277]: `Cell<util::alternating_cell::State>` cannot be shared between threads safely
  --> tests/ui/simvalue_is_not_internable.rs:12:5
   |
12 |     Intern::intern_sized(v)
   |     ^^^^^^^^^^^^^^^^^^^^^^^ `Cell<util::alternating_cell::State>` cannot be shared between threads safely
   |
   = help: within `SimValue<()>`, the trait `Sync` is not implemented for `Cell<util::alternating_cell::State>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock`
note: required because it appears within the type `util::alternating_cell::AlternatingCell<value::SimValueInner<()>>`
  --> src/util/alternating_cell.rs
   |
   | pub(crate) struct AlternatingCell<T: ?Sized> {
   |                   ^^^^^^^^^^^^^^^
note: required because it appears within the type `SimValue<()>`
  --> src/sim/value.rs
   |
   | pub struct SimValue<T: Type> {
   |            ^^^^^^^^
note: required by a bound in `fayalite::intern::Interned`
  --> src/intern.rs
   |
   | pub struct Interned<T: ?Sized + 'static + Send + Sync> {
   |                                                  ^^^^ required by this bound in `Interned`

error[E0277]: `UnsafeCell<value::SimValueInner<()>>` cannot be shared between threads safely
  --> tests/ui/simvalue_is_not_internable.rs:12:5
   |
12 |     Intern::intern_sized(v)
   |     ^^^^^^^^^^^^^^^^^^^^^^^ `UnsafeCell<value::SimValueInner<()>>` cannot be shared between threads safely
   |
   = help: within `SimValue<()>`, the trait `Sync` is not implemented for `UnsafeCell<value::SimValueInner<()>>`
note: required because it appears within the type `util::alternating_cell::AlternatingCell<value::SimValueInner<()>>`
  --> src/util/alternating_cell.rs
   |
   | pub(crate) struct AlternatingCell<T: ?Sized> {
   |                   ^^^^^^^^^^^^^^^
note: required because it appears within the type `SimValue<()>`
  --> src/sim/value.rs
   |
   | pub struct SimValue<T: Type> {
   |            ^^^^^^^^
note: required by a bound in `fayalite::intern::Interned`
  --> src/intern.rs
   |
   | pub struct Interned<T: ?Sized + 'static + Send + Sync> {
   |                                                  ^^^^ required by this bound in `Interned`