Enum rustc_middle::ty::adjustment::AllowTwoPhase[−][src]

pub enum AllowTwoPhase {
    Yes,
    No,
}

Expand description

At least for initial deployment, we want to limit two-phase borrows to only a few specific cases. Right now, those are mostly “things that desugar” into method calls:

using x.some_method() syntax, where some_method takes &mut self,
using Foo::some_method(&mut x, ...) syntax,
binary assignment operators (+=, -=, *=, etc.). Anything else should be rejected until generalized two-phase borrow support is implemented. Right now, dataflow can’t handle the general case where there is more than one use of a mutable borrow, and we don’t want to accept too much new code via two-phase borrows, so we try to limit where we create two-phase capable mutable borrows. See #49434 for tracking.

Variants

Yes

No

Trait Implementations

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impl Clone for AllowTwoPhase

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fn clone(&self) -> AllowTwoPhase

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for AllowTwoPhase

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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fn hash_stable(
 &self,
 hcx: &mut StableHashingContext<'ctx>,
 __hasher: &mut StableHasher
)

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impl PartialEq<AllowTwoPhase> for AllowTwoPhase

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fn eq(&self, other: &AllowTwoPhase) -> bool

This method tests for self and other values to be equal, and is used by ==. Read more

1.0.0[src]

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

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impl StructuralPartialEq for AllowTwoPhase

Auto Trait Implementations

impl RefUnwindSafe for AllowTwoPhase

impl UnwindSafe for AllowTwoPhase

Blanket Implementations

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impl<T> Any for T where
T: 'static + ?Sized,

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pub fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where
T: Copy,

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pub fn allocate_on(Self, &'a Arena<'tcx>) -> &'a mut T

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pub fn allocate_from_iter(
&'a Arena<'tcx>,
impl IntoIterator<Item = T>
) -> &'a mut [T]

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impl<T> Borrow<T> for T where
T: ?Sized,

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pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

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pub fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<Ctxt, T> DepNodeParams<Ctxt> for T where
Ctxt: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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pub default fn fingerprint_style() -> FingerprintStyle

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pub default fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous). Read more

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pub default fn to_debug_str(&self, Ctxt) -> String

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pub default fn recover(
Ctxt,
&DepNode<<Ctxt as DepContext>::DepKind>
) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it. Read more

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impl<T> From<T> for T

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pub fn from(t: T) -> T

Performs the conversion.

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impl<T, U> Into for T where
U: From<T>,

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pub fn into(self) -> U

Performs the conversion.

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impl<T> MaybeResult<T> for T

type Error = !

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pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T

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pub fn to_result(Self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

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pub fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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pub fn clone_into(&self, target: &mut T)

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

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impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

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pub fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

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pub fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

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impl<T> WithConstness for T

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fn with_constness(self, constness: BoundConstness) -> ConstnessAnd<Self>

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fn with_const_if_const(self) -> ConstnessAnd<Self>

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fn without_const(self) -> ConstnessAnd<Self>

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impl<'a, T> Captures<'a> for T where
T: ?Sized,

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: 1 byte

Size for each variant:

Yes: 0 bytes
No: 0 bytes

Enum rustc_middle::ty::adjustment::AllowTwoPhase[−][src]

Variants

Trait Implementations

impl Clone for AllowTwoPhase

fn clone(&self) -> AllowTwoPhase

fn clone_from(&mut self, source: &Self)

impl Debug for AllowTwoPhase

fn fmt(&self, f: &mut Formatter<'_>) -> Result

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for AllowTwoPhase

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for AllowTwoPhase

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for AllowTwoPhase

fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher)

impl PartialEq<AllowTwoPhase> for AllowTwoPhase

fn eq(&self, other: &AllowTwoPhase) -> bool

fn ne(&self, other: &Rhs) -> bool

impl Copy for AllowTwoPhase

impl StructuralPartialEq for AllowTwoPhase

Auto Trait Implementations

impl RefUnwindSafe for AllowTwoPhase

impl Send for AllowTwoPhase

impl Sync for AllowTwoPhase

impl Unpin for AllowTwoPhase

impl UnwindSafe for AllowTwoPhase

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized,

pub fn type_id(&self) -> TypeId

impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where T: Copy,

pub fn allocate_on(Self, &'a Arena<'tcx>) -> &'a mut T

pub fn allocate_from_iter( &'a Arena<'tcx>, impl IntoIterator<Item = T>) -> &'a mut [T]

impl<T> Borrow<T> for T where T: ?Sized,

pub fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

pub fn borrow_mut(&mut self) -> &mut T

impl<Ctxt, T> DepNodeParams<Ctxt> for T where Ctxt: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

pub default fn fingerprint_style() -> FingerprintStyle

pub default fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint

pub default fn to_debug_str(&self, Ctxt) -> String

pub default fn recover( Ctxt, &DepNode<<Ctxt as DepContext>::DepKind>) -> Option<T>

impl<T> From<T> for T

pub fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

pub fn into(self) -> U

impl<T> MaybeResult<T> for T

type Error = !

pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T

pub fn to_result(Self) -> Result<T, <T as MaybeResult<T>>::Error>

impl<T> ToOwned for T where T: Clone,

type Owned = T

pub fn to_owned(&self) -> T

pub fn clone_into(&self, target: &mut T)

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<T> WithConstness for T

fn with_constness(self, constness: BoundConstness) -> ConstnessAnd<Self>

fn with_const_if_const(self) -> ConstnessAnd<Self>

fn without_const(self) -> ConstnessAnd<Self>

impl<'a, T> Captures<'a> for T where T: ?Sized,

Layout

impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for AllowTwoPhase

fn decode(decoder: &mut D) -> Result<Self, <__D as Decoder>::Error>

impl<'tcx, E: TyEncoder<'tcx>> Encodable<E> for AllowTwoPhase

fn encode(&self, encoder: &mut E) -> Result<(), <__E as Encoder>::Error>

impl<'ctx> HashStable<StableHashingContext<'ctx>> for AllowTwoPhase

fn hash_stable(
&self,
hcx: &mut StableHashingContext<'ctx>,
__hasher: &mut StableHasher
)

impl<T> Any for T where
T: 'static + ?Sized,

impl<'tcx, T> ArenaAllocatable<'tcx, ()> for T where
T: Copy,

pub fn allocate_from_iter(
&'a Arena<'tcx>,
impl IntoIterator<Item = T>
) -> &'a mut [T]

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<Ctxt, T> DepNodeParams<Ctxt> for T where
Ctxt: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

pub default fn recover(
Ctxt,
&DepNode<<Ctxt as DepContext>::DepKind>
) -> Option<T>

impl<T, U> Into<U> for T where
U: From<T>,

impl<T> ToOwned for T where
T: Clone,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

impl<'a, T> Captures<'a> for T where
T: ?Sized,