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.
Fields§
§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§
source§impl<'hir, __CTX> HashStable<__CTX> for Let<'hir>where
__CTX: HashStableContext,
impl<'hir, __CTX> HashStable<__CTX> for Let<'hir>where __CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
impl<'hir> Copy for Let<'hir>
Auto Trait Implementations§
impl<'hir> RefUnwindSafe for Let<'hir>
impl<'hir> !Send for Let<'hir>
impl<'hir> !Sync for Let<'hir>
impl<'hir> Unpin for Let<'hir>
impl<'hir> UnwindSafe for Let<'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
Mutably borrows from an owned value. Read more
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