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+A non-ASCII identifier was used in an invalid context.
+
+Erroneous code examples:
+
+```compile_fail,E0754
+
+mod řųśť; // error!
+
+#[no_mangle]
+fn řųśť() {} // error!
+
+fn main() {}
+```
+
+Non-ASCII can be used as module names if it is inlined or if a `#[path]`
+attribute is specified. For example:
+
+```
+mod řųśť { // ok!
+    const IS_GREAT: bool = true;
+}
+
+fn main() {}
+```