error[E0038]: the trait `Qux` cannot be made into an object --> $DIR/unsizing-wfcheck-issue-127299.rs:8:24 | LL | pub desc: &'static dyn Qux, | ^^^^^^^ `Qux` cannot be made into an object | note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit --> $DIR/unsizing-wfcheck-issue-127299.rs:4:8 | LL | trait Qux { | --- this trait cannot be made into an object... LL | fn bar() -> i32; | ^^^ ...because associated function `bar` has no `self` parameter help: consider turning `bar` into a method by giving it a `&self` argument | LL | fn bar(&self) -> i32; | +++++ help: alternatively, consider constraining `bar` so it does not apply to trait objects | LL | fn bar() -> i32 where Self: Sized; | +++++++++++++++++ error[E0277]: `(dyn Qux + 'static)` cannot be shared between threads safely --> $DIR/unsizing-wfcheck-issue-127299.rs:12:13 | LL | static FOO: &Lint = &Lint { desc: "desc" }; | ^^^^^ `(dyn Qux + 'static)` cannot be shared between threads safely | = help: within `&'static Lint`, the trait `Sync` is not implemented for `(dyn Qux + 'static)` = note: required because it appears within the type `&'static (dyn Qux + 'static)` note: required because it appears within the type `Lint` --> $DIR/unsizing-wfcheck-issue-127299.rs:7:12 | LL | pub struct Lint { | ^^^^ = note: required because it appears within the type `&'static Lint` = note: shared static variables must have a type that implements `Sync` error[E0038]: the trait `Qux` cannot be made into an object --> $DIR/unsizing-wfcheck-issue-127299.rs:12:35 | LL | static FOO: &Lint = &Lint { desc: "desc" }; | ^^^^^^ `Qux` cannot be made into an object | note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit --> $DIR/unsizing-wfcheck-issue-127299.rs:4:8 | LL | trait Qux { | --- this trait cannot be made into an object... LL | fn bar() -> i32; | ^^^ ...because associated function `bar` has no `self` parameter = note: required for the cast from `&'static str` to `&'static (dyn Qux + 'static)` help: consider turning `bar` into a method by giving it a `&self` argument | LL | fn bar(&self) -> i32; | +++++ help: alternatively, consider constraining `bar` so it does not apply to trait objects | LL | fn bar() -> i32 where Self: Sized; | +++++++++++++++++ error[E0038]: the trait `Qux` cannot be made into an object --> $DIR/unsizing-wfcheck-issue-127299.rs:12:35 | LL | static FOO: &Lint = &Lint { desc: "desc" }; | ^^^^^^ `Qux` cannot be made into an object | note: for a trait to be "dyn-compatible" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit --> $DIR/unsizing-wfcheck-issue-127299.rs:4:8 | LL | trait Qux { | --- this trait cannot be made into an object... LL | fn bar() -> i32; | ^^^ ...because associated function `bar` has no `self` parameter help: consider turning `bar` into a method by giving it a `&self` argument | LL | fn bar(&self) -> i32; | +++++ help: alternatively, consider constraining `bar` so it does not apply to trait objects | LL | fn bar() -> i32 where Self: Sized; | +++++++++++++++++ error: aborting due to 4 previous errors Some errors have detailed explanations: E0038, E0277. For more information about an error, try `rustc --explain E0038`.