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+error[E0200]: the trait `Bar` requires an `unsafe impl` declaration
+ --> $DIR/E0200.rs:5:1
+ |
+LL | impl Bar for Foo { }
+ | ^^^^^^^^^^^^^^^^
+ |
+ = note: the trait `Bar` 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
+ |
+LL | unsafe impl Bar for Foo { }
+ | ++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0200`.