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+A type or module has been defined more than once.
+
+Erroneous code example:
+
+```compile_fail,E0428
+struct Bar;
+struct Bar; // error: duplicate definition of value `Bar`
+```
+
+Please verify you didn't misspell the type/module's name or remove/rename the
+duplicated one. Example:
+
+```
+struct Bar;
+struct Bar2; // ok!
+```