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Don't use inner macro in marker_impls

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Michael Goulet 2023-05-21 04:13:05 +00:00
parent 1b67f8b013
commit e9a5a9d7d5
1 changed files with 8 additions and 18 deletions
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26
library/core/src/marker.rs
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@ -43,27 +43,17 @@
/// ```
#[unstable(feature = "internal_impls_macro", issue = "none")]
macro marker_impls {
( $(#[$($meta:tt)*])* $Trait:ident for $( $({$($bounds:tt)*})? $T:ty ),+ $(,)?) => {
// This inner macro is needed because... idk macros are weird.
// It allows repeating `meta` on all impls.
#[unstable(feature = "internal_impls_macro", issue = "none")]
macro _impl {
( $$({$$($$bounds_:tt)*})? $$T_:ty ) => {
$(#[$($meta)*])* impl<$$($$($$bounds_)*)?> $Trait for $$T_ {}
}
}
$( _impl! { $({$($bounds)*})? $T } )+
( $(#[$($meta:tt)*])* $Trait:ident for $({$($bounds:tt)*})? $T:ty $(, $($rest:tt)*)? ) => {
$(#[$($meta)*])* impl< $($($bounds)*)? > $Trait for $T {}
marker_impls! { $(#[$($meta)*])* $Trait for $($($rest)*)? }
},
( $(#[$($meta:tt)*])* unsafe $Trait:ident for $( $({$($bounds:tt)*})? $T:ty ),+ $(,)?) => {
#[unstable(feature = "internal_impls_macro", issue = "none")]
macro _impl {
( $$({$$($$bounds_:tt)*})? $$T_:ty ) => {
$(#[$($meta)*])* unsafe impl<$$($$($$bounds_)*)?> $Trait for $$T_ {}
}
}
( $(#[$($meta:tt)*])* $Trait:ident for ) => {},
$( _impl! { $({$($bounds)*})? $T } )+
( $(#[$($meta:tt)*])* unsafe $Trait:ident for $({$($bounds:tt)*})? $T:ty $(, $($rest:tt)*)? ) => {
$(#[$($meta)*])* unsafe impl< $($($bounds)*)? > $Trait for $T {}
marker_impls! { $(#[$($meta)*])* unsafe $Trait for $($($rest)*)? }
},
( $(#[$($meta:tt)*])* unsafe $Trait:ident for ) => {},
}
/// Types that can be transferred across thread boundaries.