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+You cannot use type or const parameters on foreign items.
+
+Example of erroneous code:
+
+```compile_fail,E0044
+extern "C" { fn some_func<T>(x: T); }
+```
+
+To fix this, replace the generic parameter with the specializations that you
+need:
+
+```
+extern "C" { fn some_func_i32(x: i32); }
+extern "C" { fn some_func_i64(x: i64); }
+```