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error[E0200]: the trait `Foo` requires an `unsafe impl` declaration
--> $DIR/safety-trait-impl-cc.rs:9:1
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LL | impl lib::Foo for Bar {
| ^^^^^^^^^^^^^^^^^^^^^
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= 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
help: add `unsafe` to this trait implementation
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LL | unsafe impl lib::Foo for Bar {
| ++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0200`.
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