error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time --> $DIR/const-unsized.rs:3:16 | LL | const CONST_0: dyn Debug + Sync = *(&0 as &(dyn Debug + Sync)); | ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)` error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/const-unsized.rs:6:18 | LL | const CONST_FOO: str = *"foo"; | ^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time --> $DIR/const-unsized.rs:9:18 | LL | static STATIC_1: dyn Debug + Sync = *(&1 as &(dyn Debug + Sync)); | ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)` error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/const-unsized.rs:12:20 | LL | static STATIC_BAR: str = *"bar"; | ^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0277`.