error[E0277]: the size for values of type `(dyn std::fmt::Debug + std::marker::Sync + 'static)` cannot be known at compilation time --> $DIR/const-unsized.rs:13:29 | LL | const CONST_0: Debug+Sync = *(&0 as &(Debug+Sync)); | ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `(dyn std::fmt::Debug + std::marker::Sync + 'static)` = note: to learn more, visit = note: constant expressions must have a statically known size error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/const-unsized.rs:16:24 | LL | const CONST_FOO: str = *"foo"; | ^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `str` = note: to learn more, visit = note: constant expressions must have a statically known size error[E0277]: the size for values of type `(dyn std::fmt::Debug + std::marker::Sync + 'static)` cannot be known at compilation time --> $DIR/const-unsized.rs:19:31 | LL | static STATIC_1: Debug+Sync = *(&1 as &(Debug+Sync)); | ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `(dyn std::fmt::Debug + std::marker::Sync + 'static)` = note: to learn more, visit = note: constant expressions must have a statically known size error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/const-unsized.rs:22:26 | LL | static STATIC_BAR: str = *"bar"; | ^^^^^^ doesn't have a size known at compile-time | = help: the trait `std::marker::Sized` is not implemented for `str` = note: to learn more, visit = note: constant expressions must have a statically known size error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0277`.