Macro rustc_feature::builtin_attrs::ungated

source ยท 
macro_rules! ungated {
    (unsafe $attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { ... };
    ($attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { ... };
}