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+An unsafe trait was implemented without an unsafe implementation.
+
+Erroneous code example:
+
+```compile_fail,E0200
+struct Foo;
+
+unsafe trait Bar { }
+
+impl Bar for Foo { } // error!
+```
+
+Unsafe traits must have unsafe implementations. This error occurs when an
+implementation for an unsafe trait isn't marked as unsafe. This may be resolved
+by marking the unsafe implementation as unsafe.
+
+```
+struct Foo;
+
+unsafe trait Bar { }
+
+unsafe impl Bar for Foo { } // ok!
+```