Macro variadic_generics::va_expand

macro_rules! va_expand {
    ($($tt : tt) +) => { ... };
}

Generates a macro for you and immediatly passes it on to va_invoke.

va_expand!{ ($va_len:tt) ($($va_idents),+) ($($va_indices:tt),+)
    ...
}

will be expanded to

macro_rules! _va_mac {
    (($va_len:tt) ($($va_idents),+) ($($va_indices:tt),+)) => {
        ...
    }
}
va_invoke!(_va_mac);

---

NOTE Due to language limitations (macro-expanded macro_rules!s may not shadow existing macros (see RFC 1560)), when calling this macro twice or more within the same module, you need to supply a unique identifier as the very first argument (which will be the name of the generated macro). You can choose it to be random or descriptive.

va_expand!{ _asf ($va_len:tt) ($($va_idents),+) ($($va_indices:tt),+)
    ...
}
va_expand!{ _impl_mytraits ($va_len:tt) ($($va_idents),+)
($($va_indices:tt),+)
    ...
}