diff options
Diffstat (limited to 'library/core/src')
| -rw-r--r-- | library/core/src/macros/mod.rs | 15 | ||||
| -rw-r--r-- | library/core/src/prelude/v1.rs | 8 |
2 files changed, 23 insertions, 0 deletions
diff --git a/library/core/src/macros/mod.rs b/library/core/src/macros/mod.rs index 16200184422..a527a2ea5aa 100644 --- a/library/core/src/macros/mod.rs +++ b/library/core/src/macros/mod.rs @@ -1743,6 +1743,21 @@ pub(crate) mod builtin { /* compiler built-in */ } + /// Provide a list of type aliases and other opaque-type-containing type definitions. + /// This list will be used in the body of the item it is applied to to define opaque + /// types' hidden types. + /// Can only be applied to things that have bodies. + #[unstable( + feature = "type_alias_impl_trait", + issue = "63063", + reason = "`type_alias_impl_trait` has open design concerns" + )] + #[rustc_builtin_macro] + #[cfg(not(bootstrap))] + pub macro define_opaque($($tt:tt)*) { + /* compiler built-in */ + } + /// Unstable placeholder for type ascription. #[allow_internal_unstable(builtin_syntax)] #[unstable( diff --git a/library/core/src/prelude/v1.rs b/library/core/src/prelude/v1.rs index 50fd67e8395..c5975c03050 100644 --- a/library/core/src/prelude/v1.rs +++ b/library/core/src/prelude/v1.rs @@ -111,3 +111,11 @@ pub use crate::macros::builtin::type_ascribe; reason = "placeholder syntax for deref patterns" )] pub use crate::macros::builtin::deref; + +#[unstable( + feature = "type_alias_impl_trait", + issue = "63063", + reason = "`type_alias_impl_trait` has open design concerns" +)] +#[cfg(not(bootstrap))] +pub use crate::macros::builtin::define_opaque; |