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+A literal was used in a built-in attribute that doesn't support literals.
+
+Erroneous code example:
+
+```compile_fail,E0565
+#[repr("C")] // error: meta item in `repr` must be an identifier
+struct Repr {}
+
+fn main() {}
+```
+
+Literals in attributes are new and largely unsupported in built-in attributes.
+Work to support literals where appropriate is ongoing. Try using an unquoted
+name instead:
+
+```
+#[repr(C)] // ok!
+struct Repr {}
+
+fn main() {}
+```