pub struct OpaqueTy<'hir> {
pub generics: &'hir Generics<'hir>,
pub bounds: GenericBounds<'hir>,
pub origin: OpaqueTyOrigin,
pub lifetime_mapping: &'hir [(&'hir Lifetime, LocalDefId)],
pub in_trait: bool,
}
Fields§
§generics: &'hir Generics<'hir>
§bounds: GenericBounds<'hir>
§origin: OpaqueTyOrigin
§lifetime_mapping: &'hir [(&'hir Lifetime, LocalDefId)]
Return-position impl traits (and async futures) must “reify” any late-bound lifetimes that are captured from the function signature they originate from.
This is done by generating a new early-bound lifetime parameter local to the opaque which is substituted in the function signature with the late-bound lifetime.
This mapping associated a captured lifetime (first parameter) with the new early-bound lifetime that was generated for the opaque.
in_trait: bool
Whether the opaque is a return-position impl trait (or async future) originating from a trait method. This makes it so that the opaque is lowered as an associated type.
Trait Implementations§
source§impl<'hir, __CTX> HashStable<__CTX> for OpaqueTy<'hir>where
__CTX: HashStableContext,
impl<'hir, __CTX> HashStable<__CTX> for OpaqueTy<'hir>where __CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
impl<'hir> Copy for OpaqueTy<'hir>
Auto Trait Implementations§
impl<'hir> RefUnwindSafe for OpaqueTy<'hir>
impl<'hir> !Send for OpaqueTy<'hir>
impl<'hir> !Sync for OpaqueTy<'hir>
impl<'hir> Unpin for OpaqueTy<'hir>
impl<'hir> UnwindSafe for OpaqueTy<'hir>
Blanket Implementations§
source§impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere
T: Copy,
impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere T: Copy,
fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T
fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 56 bytes