Struct LetExpr

Source

pub struct LetExpr<'hir> {
    pub span: Span,
    pub pat: &'hir Pat<'hir>,
    pub ty: Option<&'hir Ty<'hir>>,
    pub init: &'hir Expr<'hir>,
    pub recovered: Recovered,
}

Expand description

Represents a let <pat>[: <ty>] = <expr> expression (not a LetStmt), occurring in an if-let or let-else, evaluating to a boolean. Typically the pattern is refutable.

In an if let, imagine it as if (let <pat> = <expr>) { ... }; in a let-else, it is part of the desugaring to if-let. Only let-else supports the type annotation at present.

Fields§

§span: Span§pat: &'hir Pat<'hir>§ty: Option<&'hir Ty<'hir>>§init: &'hir Expr<'hir>§recovered: Recovered

Recovered::Yes when this let expressions is not in a syntactically valid location. Used to prevent building MIR in such situations.

Struct LetExprCopy item path

Fields§

Trait Implementations§

impl<'hir> Clone for LetExpr<'hir>

fn clone(&self) -> LetExpr<'hir>

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

impl<'hir> Debug for LetExpr<'hir>

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

impl<'hir, __CTX> HashStable<__CTX> for LetExpr<'hir>where __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl<'hir> Copy for LetExpr<'hir>

Auto Trait Implementations§

impl<'hir> DynSend for LetExpr<'hir>

impl<'hir> DynSync for LetExpr<'hir>

impl<'hir> Freeze for LetExpr<'hir>

impl<'hir> RefUnwindSafe for LetExpr<'hir>

impl<'hir> Send for LetExpr<'hir>

impl<'hir> Sync for LetExpr<'hir>

impl<'hir> Unpin for LetExpr<'hir>

impl<'hir> UnwindSafe for LetExpr<'hir>

Blanket Implementations§

impl<T> Aligned for T

const ALIGN: Alignment = _

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

fn type_id(&self) -> TypeId

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]

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

fn borrow(&self) -> &T

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

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

impl<T> CloneToUninit for Twhere T: Clone,

unsafe fn clone_to_uninit(&self, dst: *mut T)

impl<T> From<T> for T

fn from(t: T) -> T

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

fn in_current_span(self) -> Instrumented<Self>

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

fn into(self) -> U

impl<T> IntoEither for T

fn into_either(self, into_left: bool) -> Either<Self, Self>

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>where F: FnOnce(&Self) -> bool,

impl<T> Pointable for T

const ALIGN: usize = _

type Init = T

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

impl<T> Same for T

type Output = T

impl<T> ToOwned for Twhere T: Clone,

type Owned = T

fn to_owned(&self) -> T

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

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

type Error = Infallible

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

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

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

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

impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

fn vzip(self) -> V

impl<T> WithSubscriber for T

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

fn with_current_subscriber(self) -> WithDispatch<Self>

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

Layout§

Struct LetExpr

impl<'hir, CTX> HashStable<CTX> for LetExpr<'hir>
where __CTX: HashStableContext,

fn hash_stable(&self, hcx: &mut CTX, __hasher: &mut StableHasher)

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

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

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

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

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

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

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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<V, T> VZip<V> for T
where V: MultiLane<T>,

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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