pub struct UserTypeProjection {
pub base: UserTypeAnnotationIndex,
pub projs: Vec<ProjectionKind>,
}
Expand description
Encodes the effect of a user-supplied type annotation on the
subcomponents of a pattern. The effect is determined by applying the
given list of projections to some underlying base type. Often,
the projection element list projs
is empty, in which case this
directly encodes a type in base
. But in the case of complex patterns with
subpatterns and bindings, we want to apply only a part of the type to a variable,
in which case the projs
vector is used.
Examples:
-
let x: T = ...
– here, theprojs
vector is empty. -
let (x, _): T = ...
– here, theprojs
vector would containfield[0]
(aka.0
), indicating that the type ofs
is determined by finding the type of the.0
field fromT
.
Fields§
§base: UserTypeAnnotationIndex
§projs: Vec<ProjectionKind>
Implementations§
Source§impl UserTypeProjection
impl UserTypeProjection
pub(crate) fn index(self) -> Self
pub(crate) fn subslice(self, from: u64, to: u64) -> Self
pub(crate) fn deref(self) -> Self
pub(crate) fn leaf(self, field: FieldIdx) -> Self
pub(crate) fn variant( self, adt_def: AdtDef<'_>, variant_index: VariantIdx, field_index: FieldIdx, ) -> Self
Trait Implementations§
Source§impl Clone for UserTypeProjection
impl Clone for UserTypeProjection
Source§fn clone(&self) -> UserTypeProjection
fn clone(&self) -> UserTypeProjection
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for UserTypeProjection
impl Debug for UserTypeProjection
Source§impl<__D: TyDecoder> Decodable<__D> for UserTypeProjection
impl<__D: TyDecoder> Decodable<__D> for UserTypeProjection
Source§impl<__E: TyEncoder> Encodable<__E> for UserTypeProjection
impl<__E: TyEncoder> Encodable<__E> for UserTypeProjection
Source§impl Hash for UserTypeProjection
impl Hash for UserTypeProjection
Source§impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for UserTypeProjection
impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for UserTypeProjection
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )
Source§impl PartialEq for UserTypeProjection
impl PartialEq for UserTypeProjection
Source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for UserTypeProjection
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for UserTypeProjection
Source§fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
__folder: &mut __F,
) -> Result<Self, __F::Error>
fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, __folder: &mut __F, ) -> Result<Self, __F::Error>
Source§fn fold_with<F>(self, folder: &mut F) -> Selfwhere
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fn fold_with<F>(self, folder: &mut F) -> Selfwhere
F: TypeFolder<I>,
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
.Source§impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for UserTypeProjection
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for UserTypeProjection
Source§fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>(
&self,
__visitor: &mut __V,
) -> __V::Result
fn visit_with<__V: TypeVisitor<TyCtxt<'tcx>>>( &self, __visitor: &mut __V, ) -> __V::Result
impl StructuralPartialEq for UserTypeProjection
Auto Trait Implementations§
impl DynSend for UserTypeProjection
impl DynSync for UserTypeProjection
impl Freeze for UserTypeProjection
impl RefUnwindSafe for UserTypeProjection
impl Send for UserTypeProjection
impl Sync for UserTypeProjection
impl Unpin for UserTypeProjection
impl UnwindSafe for UserTypeProjection
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unsafe fn clone_to_uninit(&self, dst: *mut T)
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impl<T, R> CollectAndApply<T, R> for T
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Size: 32 bytes