/// Derive macro generating an impl of the trait `Default`.
#[rustc_builtin_macro]
-#[cfg_attr(bootstrap, rustc_macro_transparency = "semitransparent")]
#[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
#[allow_internal_unstable(core_intrinsics)]
-pub macro Default($item:item) { /* compiler built-in */ }
+pub macro Default($item:item) {
+ /* compiler built-in */
+}
macro_rules! default_impl {
($t:ty, $v:expr, $doc:tt) => {