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# Error code E0565

A literal was used in a built-in attribute that doesn’t support literals.

Erroneous code example:

    #[repr("C")] // error: meta item in `repr` must be an identifier
    struct Repr {}

    fn main() {}

Not all attributes support literals in their input, and in some cases they expect an identifier instead. That would be the solution in the case of `repr`:

    #[repr(C)] // ok!
    struct Repr {}

    fn main() {}