Struct rustc_hir::Let

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pub struct Let<'hir> {
    pub hir_id: HirId,
    pub span: Span,
    pub pat: &'hir Pat<'hir>,
    pub ty: Option<&'hir Ty<'hir>>,
    pub init: &'hir Expr<'hir>,
    pub is_recovered: Option<ErrorGuaranteed>,
}
Expand description

Represents a let <pat>[: <ty>] = <expr> expression (not a Local), 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.

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§hir_id: HirId§span: Span§pat: &'hir Pat<'hir>§ty: Option<&'hir Ty<'hir>>§init: &'hir Expr<'hir>§is_recovered: Option<ErrorGuaranteed>

Some when this let expressions is not in a syntanctically valid location. Used to prevent building MIR in such situations.

Trait Implementations§

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impl<'hir> Clone for Let<'hir>

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

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<'hir> Debug for Let<'hir>

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

Formats the value using the given formatter. Read more
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impl<'hir, __CTX> HashStable<__CTX> for Let<'hir>where __CTX: HashStableContext,

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

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impl<'hir> Copy for Let<'hir>

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impl<'hir> RefUnwindSafe for Let<'hir>

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impl<'hir> !Send for Let<'hir>

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impl<'hir> !Sync for Let<'hir>

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impl<'hir> Unpin for Let<'hir>

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impl<'hir> UnwindSafe for Let<'hir>

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for Twhere T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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

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

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 48 bytes