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>,
}
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>
Trait Implementations
sourceimpl<'tcx> ArenaAllocatable<'tcx, IsNotCopy> for Let<'tcx>
impl<'tcx> ArenaAllocatable<'tcx, IsNotCopy> for Let<'tcx>
fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut Self
fn allocate_from_iter<'a>(
arena: &'a Arena<'tcx>,
iter: impl IntoIterator<Item = Self>
) -> &'a mut [Self]ⓘNotable traits for &[u8]impl Read for &[u8]impl Write for &mut [u8]
sourceimpl<'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)
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
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn 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: 40 bytes