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+The name chosen for an external crate conflicts with another external crate
+that has been imported into the current module.
+
+Erroneous code example:
+
+```compile_fail,E0259
+extern crate core;
+extern crate std as core;
+
+fn main() {}
+```
+
+The solution is to choose a different name that doesn't conflict with any
+external crate imported into the current module.
+
+Correct example:
+
+```
+extern crate core;
+extern crate std as other_name;
+
+fn main() {}
+```