1 error[E0200]: the trait `Foo` requires an `unsafe impl` declaration
2 --> $DIR/safety-trait-impl-cc.rs:9:1
4 LL | / impl lib::Foo for Bar {
5 LL | | fn foo(&self) -> isize {
11 = note: the trait `Foo` enforces invariants that the compiler can't check. Review the trait documentation and make sure this implementation upholds those invariants before adding the `unsafe` keyword
12 help: add `unsafe` to this trait implementation
14 LL | unsafe impl lib::Foo for Bar {
17 error: aborting due to previous error
19 For more information about this error, try `rustc --explain E0200`.