error[E0412]: cannot find type `PhantomData` in this scope --> $DIR/issue-78372.rs:2:23 | LL | struct Smaht(PhantomData); | ^^^^^^^^^^^ not found in this scope | help: consider importing this struct | LL | use std::marker::PhantomData; | error[E0412]: cannot find type `U` in this scope --> $DIR/issue-78372.rs:3:31 | LL | impl DispatchFromDyn> for T {} | - ^ | | | similarly named type parameter `T` defined here | help: a type parameter with a similar name exists | LL | impl DispatchFromDyn> for T {} | ~ help: you might be missing a type parameter | LL | impl DispatchFromDyn> for T {} | +++ error[E0412]: cannot find type `MISC` in this scope --> $DIR/issue-78372.rs:3:34 | LL | impl DispatchFromDyn> for T {} | ^^^^ not found in this scope | help: you might be missing a type parameter | LL | impl DispatchFromDyn> for T {} | ++++++ error[E0658]: use of unstable library feature 'dispatch_from_dyn' --> $DIR/issue-78372.rs:1:5 | LL | use std::ops::DispatchFromDyn; | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add `#![feature(dispatch_from_dyn)]` to the crate attributes to enable error[E0658]: use of unstable library feature 'dispatch_from_dyn' --> $DIR/issue-78372.rs:3:9 | LL | impl DispatchFromDyn> for T {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add `#![feature(dispatch_from_dyn)]` to the crate attributes to enable error[E0378]: the trait `DispatchFromDyn` may only be implemented for a coercion between structures --> $DIR/issue-78372.rs:3:1 | LL | impl DispatchFromDyn> for T {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 6 previous errors Some errors have detailed explanations: E0378, E0412, E0658. For more information about an error, try `rustc --explain E0378`.