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error: type parameter `T` is only used recursively
--> $DIR/issue-105231.rs:1:15
|
LL | struct A<T>(B<T>);
| - ^
| |
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error[E0072]: recursive types `A` and `B` have infinite size
--> $DIR/issue-105231.rs:1:1
|
LL | struct A<T>(B<T>);
| ^^^^^^^^^^^ ---- recursive without indirection
...
LL | struct B<T>(A<A<T>>);
| ^^^^^^^^^^^ ------- recursive without indirection
|
help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
|
LL ~ struct A<T>(Box<B<T>>);
LL |
LL |
LL ~ struct B<T>(Box<A<A<T>>>);
|
error: type parameter `T` is only used recursively
--> $DIR/issue-105231.rs:4:17
|
LL | struct B<T>(A<A<T>>);
| - ^
| |
| type parameter must be used non-recursively in the definition
|
= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= note: all type parameters must be used in a non-recursive way in order to constrain their variance
error[E0119]: conflicting implementations of trait `Foo` for type `B<u8>`
--> $DIR/issue-105231.rs:8:1
|
LL | impl<T> Foo for T where T: Send {}
| ------------------------------- first implementation here
LL | impl Foo for B<u8> {}
| ^^^^^^^^^^^^^^^^^^ conflicting implementation for `B<u8>`
|
= note: overflow evaluating the requirement `B<u8>: Send`
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`issue_105231`)
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0072, E0119.
For more information about an error, try `rustc --explain E0072`.
|
