pub enum BorrowKind {
Shared,
Fake(FakeBorrowKind),
Mut {
kind: MutBorrowKind,
},
}
Variants§
Data must be immutable and is aliasable.
Fake(FakeBorrowKind)
An immutable, aliasable borrow that is discarded after borrow-checking. Can behave either
like a normal shared borrow or like a special shallow borrow (see FakeBorrowKind
).
This is used when lowering index expressions and matches. This is used to prevent code like the following from compiling:
ⓘ
let mut x: &[_] = &[[0, 1]];
let y: &[_] = &[];
let _ = x[0][{x = y; 1}];
ⓘ
let mut x = &Some(0);
match *x {
None => (),
Some(_) if { x = &None; false } => (),
Some(_) => (),
}
We can also report errors with this kind of borrow differently.
Mut
Data is mutable and not aliasable.
Fields
§
kind: MutBorrowKind
Implementations§
Source§impl BorrowKind
impl BorrowKind
pub fn mutability(&self) -> Mutability
pub fn allows_two_phase_borrow(&self) -> bool
Source§impl BorrowKind
impl BorrowKind
pub fn to_mutbl_lossy(self) -> Mutability
Trait Implementations§
Source§impl Clone for BorrowKind
impl Clone for BorrowKind
Source§fn clone(&self) -> BorrowKind
fn clone(&self) -> BorrowKind
Returns a copy of the value. Read more
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moreSource§impl Debug for BorrowKind
impl Debug for BorrowKind
Source§impl<__D: TyDecoder> Decodable<__D> for BorrowKind
impl<__D: TyDecoder> Decodable<__D> for BorrowKind
Source§impl<__E: TyEncoder> Encodable<__E> for BorrowKind
impl<__E: TyEncoder> Encodable<__E> for BorrowKind
Source§impl Hash for BorrowKind
impl Hash for BorrowKind
Source§impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for BorrowKind
impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for BorrowKind
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )
Source§impl Ord for BorrowKind
impl Ord for BorrowKind
Source§fn cmp(&self, other: &BorrowKind) -> Ordering
fn cmp(&self, other: &BorrowKind) -> Ordering
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
Source§impl PartialEq for BorrowKind
impl PartialEq for BorrowKind
Source§impl PartialOrd for BorrowKind
impl PartialOrd for BorrowKind
Source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for BorrowKind
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for BorrowKind
Source§fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
_: &mut F,
) -> Result<Self, F::Error>
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, _: &mut F, ) -> Result<Self, F::Error>
Source§impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for BorrowKind
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for BorrowKind
Source§fn visit_with<F: TypeVisitor<TyCtxt<'tcx>>>(&self, _: &mut F) -> F::Result
fn visit_with<F: TypeVisitor<TyCtxt<'tcx>>>(&self, _: &mut F) -> F::Result
impl Copy for BorrowKind
impl Eq for BorrowKind
impl StructuralPartialEq for BorrowKind
Auto Trait Implementations§
impl DynSend for BorrowKind
impl DynSync for BorrowKind
impl Freeze for BorrowKind
impl RefUnwindSafe for BorrowKind
impl Send for BorrowKind
impl Sync for BorrowKind
impl Unpin for BorrowKind
impl UnwindSafe for BorrowKind
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(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T
fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]
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fn allocate_on(self, arena: &'tcx Arena<'tcx>) -> &'tcx mut T
fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx 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
Mutably borrows from an owned value. Read more
Source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
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Source§impl<Q, K> Comparable<K> for Q
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Source§impl<Tcx, T> DepNodeParams<Tcx> for T
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Source§default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
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Source§default fn recover(_: Tcx, _: &DepNode) -> Option<T>
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impl<Q, K> Equivalent<K> for Q
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Source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
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impl<T> Filterable for T
Source§fn filterable(
self,
filter_name: &'static str,
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Source§fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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For example, for<'a> fn(&'a i32)
return false
, while fn(&'a i32)
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fn has_opaque_types(&self) -> bool
fn has_coroutines(&self) -> bool
fn references_error(&self) -> bool
fn has_non_region_param(&self) -> bool
fn has_infer_regions(&self) -> bool
fn has_infer_types(&self) -> bool
fn has_non_region_infer(&self) -> bool
fn has_infer(&self) -> bool
fn has_placeholders(&self) -> bool
fn has_non_region_placeholders(&self) -> bool
fn has_param(&self) -> bool
Source§fn has_free_regions(&self) -> bool
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“Free” regions in this context means that it has any region
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fn has_erased_regions(&self) -> bool
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fn has_erasable_regions(&self) -> bool
True if there are any un-erased free regions.
Source§fn is_global(&self) -> bool
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Indicates whether this value references only ‘global’
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Source§fn has_bound_regions(&self) -> bool
fn has_bound_regions(&self) -> bool
True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool
True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool
True if there are any bound variables
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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: 2 bytes
Size for each variant:
Shared
: 0 bytesFake
: 1 byteMut
: 1 byte