Enum rustc_middle::ty::VariantDiscr
source · pub enum VariantDiscr {
Explicit(DefId),
Relative(u32),
}
Variants§
Explicit(DefId)
Explicit value for this variant, i.e., X = 123
.
The DefId
corresponds to the embedded constant.
Relative(u32)
The previous variant’s discriminant plus one.
For efficiency reasons, the distance from the
last Explicit
discriminant is being stored,
or 0
for the first variant, if it has none.
Trait Implementations§
source§impl Clone for VariantDiscr
impl Clone for VariantDiscr
source§fn clone(&self) -> VariantDiscr
fn clone(&self) -> VariantDiscr
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for VariantDiscr
impl Debug for VariantDiscr
source§impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for VariantDiscr
impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for VariantDiscr
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )
source§impl PartialEq<VariantDiscr> for VariantDiscr
impl PartialEq<VariantDiscr> for VariantDiscr
source§fn eq(&self, other: &VariantDiscr) -> bool
fn eq(&self, other: &VariantDiscr) -> bool
This method tests for
self
and other
values to be equal, and is used
by ==
.impl Copy for VariantDiscr
impl Eq for VariantDiscr
impl StructuralEq for VariantDiscr
impl StructuralPartialEq for VariantDiscr
Auto Trait Implementations§
impl RefUnwindSafe for VariantDiscr
impl Send for VariantDiscr
impl Sync for VariantDiscr
impl Unpin for VariantDiscr
impl UnwindSafe for VariantDiscr
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
source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<Tcx, T> DepNodeParams<Tcx> for Twhere
Tcx: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
impl<Tcx, T> DepNodeParams<Tcx> for Twhere Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
default fn fingerprint_style() -> FingerprintStyle
source§default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint
This method turns the parameters of a DepNodeConstructor into an opaque
Fingerprint to be used in DepNode.
Not all DepNodeParams support being turned into a Fingerprint (they
don’t need to if the corresponding DepNode is anonymous).
default fn to_debug_str(&self, _: Tcx) -> String
source§default fn recover(_: Tcx, _: &DepNode) -> Option<T>
default fn recover(_: Tcx, _: &DepNode) -> Option<T>
This method tries to recover the query key from the given
DepNode
,
something which is needed when forcing DepNode
s during red-green
evaluation. The query system will only call this method if
fingerprint_style()
is not FingerprintStyle::Opaque
.
It is always valid to return None
here, in which case incremental
compilation will treat the query as having changed instead of forcing it.source§impl<P> IntoQueryParam<P> for P
impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
source§impl<'tcx, T> ToPredicate<'tcx, T> for T
impl<'tcx, T> ToPredicate<'tcx, T> for T
fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T
source§impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T
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: 8 bytes
Size for each variant:
Explicit
: 8 bytesRelative
: 8 bytes