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+The code refers to a trait that is not in scope.
+
+Erroneous code example:
+
+```compile_fail,E0405
+struct Foo;
+
+impl SomeTrait for Foo {} // error: trait `SomeTrait` is not in scope
+```
+
+Please verify that the name of the trait wasn't misspelled and ensure that it
+was imported. Example:
+
+```
+# #[cfg(for_demonstration_only)]
+// solution 1:
+use some_file::SomeTrait;
+
+// solution 2:
+trait SomeTrait {
+    // some functions
+}
+
+struct Foo;
+
+impl SomeTrait for Foo { // ok!
+    // implements functions
+}
+```