error[E0199]: implementing the trait `MySafeTrait` is not unsafe
  --> $DIR/coherence-default-trait-impl.rs:8:1
   |
LL | unsafe impl MySafeTrait for Foo {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: remove `unsafe` from this trait implementation
   |
LL - unsafe impl MySafeTrait for Foo {}
LL + impl MySafeTrait for Foo {}
   |

error[E0200]: the trait `MyUnsafeTrait` requires an `unsafe impl` declaration
  --> $DIR/coherence-default-trait-impl.rs:13:1
   |
LL | impl MyUnsafeTrait for Foo {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the trait `MyUnsafeTrait` 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 MyUnsafeTrait for Foo {}
   | ++++++

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0199, E0200.
For more information about an error, try `rustc --explain E0199`.