Enum rustc_middle::traits::ImplSource
source · pub enum ImplSource<'tcx, N> {
Show 14 variants
UserDefined(ImplSourceUserDefinedData<'tcx, N>),
AutoImpl(ImplSourceAutoImplData<N>),
Param(Vec<N>, BoundConstness),
Object(ImplSourceObjectData<'tcx, N>),
Builtin(ImplSourceBuiltinData<N>),
TraitUpcasting(ImplSourceTraitUpcastingData<'tcx, N>),
Closure(ImplSourceClosureData<'tcx, N>),
FnPointer(ImplSourceFnPointerData<'tcx, N>),
DiscriminantKind(ImplSourceDiscriminantKindData),
Pointee(ImplSourcePointeeData),
Generator(ImplSourceGeneratorData<'tcx, N>),
TraitAlias(ImplSourceTraitAliasData<'tcx, N>),
ConstDestruct(ImplSourceConstDestructData<N>),
Tuple,
}
Expand description
Given the successful resolution of an obligation, the ImplSource
indicates where the impl comes from.
For example, the obligation may be satisfied by a specific impl (case A), or it may be relative to some bound that is in scope (case B).
impl<T:Clone> Clone<T> for Option<T> { ... } // Impl_1
impl<T:Clone> Clone<T> for Box<T> { ... } // Impl_2
impl Clone for i32 { ... } // Impl_3
fn foo<T: Clone>(concrete: Option<Box<i32>>, param: T, mixed: Option<T>) {
// Case A: ImplSource points at a specific impl. Only possible when
// type is concretely known. If the impl itself has bounded
// type parameters, ImplSource will carry resolutions for those as well:
concrete.clone(); // ImplSource(Impl_1, [ImplSource(Impl_2, [ImplSource(Impl_3)])])
// Case A: ImplSource points at a specific impl. Only possible when
// type is concretely known. If the impl itself has bounded
// type parameters, ImplSource will carry resolutions for those as well:
concrete.clone(); // ImplSource(Impl_1, [ImplSource(Impl_2, [ImplSource(Impl_3)])])
// Case B: ImplSource must be provided by caller. This applies when
// type is a type parameter.
param.clone(); // ImplSource::Param
// Case C: A mix of cases A and B.
mixed.clone(); // ImplSource(Impl_1, [ImplSource::Param])
}
The type parameter N
See explanation on ImplSourceUserDefinedData
.
Variants
UserDefined(ImplSourceUserDefinedData<'tcx, N>)
ImplSource identifying a particular impl.
AutoImpl(ImplSourceAutoImplData<N>)
ImplSource for auto trait implementations.
This carries the information and nested obligations with regards
to an auto implementation for a trait Trait
. The nested obligations
ensure the trait implementation holds for all the constituent types.
Param(Vec<N>, BoundConstness)
Successful resolution to an obligation provided by the caller
for some type parameter. The Vec<N>
represents the
obligations incurred from normalizing the where-clause (if
any).
Object(ImplSourceObjectData<'tcx, N>)
Virtual calls through an object.
Builtin(ImplSourceBuiltinData<N>)
Successful resolution for a builtin trait.
TraitUpcasting(ImplSourceTraitUpcastingData<'tcx, N>)
ImplSource for trait upcasting coercion
Closure(ImplSourceClosureData<'tcx, N>)
ImplSource automatically generated for a closure. The DefId
is the ID
of the closure expression. This is an ImplSource::UserDefined
in spirit, but the
impl is generated by the compiler and does not appear in the source.
FnPointer(ImplSourceFnPointerData<'tcx, N>)
Same as above, but for a function pointer type with the given signature.
DiscriminantKind(ImplSourceDiscriminantKindData)
ImplSource for a builtin DeterminantKind
trait implementation.
Pointee(ImplSourcePointeeData)
ImplSource for a builtin Pointee
trait implementation.
Generator(ImplSourceGeneratorData<'tcx, N>)
ImplSource automatically generated for a generator.
TraitAlias(ImplSourceTraitAliasData<'tcx, N>)
ImplSource for a trait alias.
ConstDestruct(ImplSourceConstDestructData<N>)
ImplSource for a const Drop
implementation.
Tuple
ImplSource for a std::marker::Tuple
implementation.
This has no nested predicates ever, so no data.
Implementations
sourceimpl<'tcx, N> ImplSource<'tcx, N>
impl<'tcx, N> ImplSource<'tcx, N>
pub fn nested_obligations(self) -> Vec<N>
pub fn borrow_nested_obligations(&self) -> &[N]ⓘNotable traits for &[u8]impl Read for &[u8]impl Write for &mut [u8]
pub fn map<M, F>(self, f: F) -> ImplSource<'tcx, M>where
F: FnMut(N) -> M,
Trait Implementations
sourceimpl<'tcx> ArenaAllocatable<'tcx, IsNotCopy> for ImplSource<'tcx, ()>
impl<'tcx> ArenaAllocatable<'tcx, IsNotCopy> for ImplSource<'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<'tcx, N: Clone> Clone for ImplSource<'tcx, N>
impl<'tcx, N: Clone> Clone for ImplSource<'tcx, N>
sourcefn clone(&self) -> ImplSource<'tcx, N>
fn clone(&self) -> ImplSource<'tcx, N>
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresourceimpl<'tcx, N: Debug> Debug for ImplSource<'tcx, N>
impl<'tcx, N: Debug> Debug for ImplSource<'tcx, N>
sourceimpl<'tcx, N, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for ImplSource<'tcx, N>where
N: Decodable<__D>,
impl<'tcx, N, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for ImplSource<'tcx, N>where
N: Decodable<__D>,
sourceimpl<'tcx, N, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for ImplSource<'tcx, N>where
N: Encodable<__E>,
impl<'tcx, N, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for ImplSource<'tcx, N>where
N: Encodable<__E>,
sourceimpl<'tcx, '__ctx, N> HashStable<StableHashingContext<'__ctx>> for ImplSource<'tcx, N>where
N: HashStable<StableHashingContext<'__ctx>>,
impl<'tcx, '__ctx, N> HashStable<StableHashingContext<'__ctx>> for ImplSource<'tcx, N>where
N: HashStable<StableHashingContext<'__ctx>>,
fn hash_stable(
&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
sourceimpl<'tcx, '__lifted, N> Lift<'__lifted> for ImplSource<'tcx, N>where
N: Lift<'__lifted>,
impl<'tcx, '__lifted, N> Lift<'__lifted> for ImplSource<'tcx, N>where
N: Lift<'__lifted>,
type Lifted = ImplSource<'__lifted, <N as Lift<'__lifted>>::Lifted>
fn lift_to_tcx(
self,
__tcx: TyCtxt<'__lifted>
) -> Option<ImplSource<'__lifted, N::Lifted>>
sourceimpl<'tcx, N: PartialEq> PartialEq<ImplSource<'tcx, N>> for ImplSource<'tcx, N>
impl<'tcx, N: PartialEq> PartialEq<ImplSource<'tcx, N>> for ImplSource<'tcx, N>
sourcefn eq(&self, other: &ImplSource<'tcx, N>) -> bool
fn eq(&self, other: &ImplSource<'tcx, N>) -> bool
sourceimpl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ImplSource<'tcx, ()>
impl<'tcx, D: TyDecoder<I = TyCtxt<'tcx>>> RefDecodable<'tcx, D> for ImplSource<'tcx, ()>
sourceimpl<'tcx, N> TypeFoldable<'tcx> for ImplSource<'tcx, N>where
N: TypeFoldable<'tcx>,
impl<'tcx, N> TypeFoldable<'tcx> for ImplSource<'tcx, N>where
N: TypeFoldable<'tcx>,
sourcefn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
self,
__folder: &mut __F
) -> Result<Self, __F::Error>
fn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
self,
__folder: &mut __F
) -> Result<Self, __F::Error>
sourcefn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
try_fold_with
for use with infallible
folders. Do not override this method, to ensure coherence with
try_fold_with
. Read moresourceimpl<'tcx, N> TypeVisitable<'tcx> for ImplSource<'tcx, N>where
N: TypeVisitable<'tcx>,
impl<'tcx, N> TypeVisitable<'tcx> for ImplSource<'tcx, N>where
N: TypeVisitable<'tcx>,
sourcefn visit_with<__V: TypeVisitor<'tcx>>(
&self,
__visitor: &mut __V
) -> ControlFlow<__V::BreakTy>
fn visit_with<__V: TypeVisitor<'tcx>>(
&self,
__visitor: &mut __V
) -> ControlFlow<__V::BreakTy>
sourcefn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
true
if self
has any late-bound regions that are either
bound by binder
or bound by some binder outside of binder
.
If binder
is ty::INNERMOST
, this indicates whether
there are any late-bound regions that appear free. Read moresourcefn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
true
if this self
has any regions that escape binder
(and
hence are not bound by it). Read morefn has_escaping_bound_vars(&self) -> bool
fn has_type_flags(&self, flags: TypeFlags) -> bool
fn has_projections(&self) -> bool
fn has_opaque_types(&self) -> bool
fn references_error(&self) -> bool
fn error_reported(&self) -> Option<ErrorGuaranteed>
fn has_param_types_or_consts(&self) -> bool
fn has_infer_regions(&self) -> bool
fn has_infer_types(&self) -> bool
fn has_infer_types_or_consts(&self) -> bool
fn needs_infer(&self) -> bool
fn has_placeholders(&self) -> bool
fn needs_subst(&self) -> bool
sourcefn has_free_regions(&self) -> bool
fn has_free_regions(&self) -> bool
fn has_erased_regions(&self) -> bool
sourcefn has_erasable_regions(&self) -> bool
fn has_erasable_regions(&self) -> bool
sourcefn is_global(&self) -> bool
fn is_global(&self) -> bool
sourcefn has_late_bound_regions(&self) -> bool
fn has_late_bound_regions(&self) -> bool
sourcefn still_further_specializable(&self) -> bool
fn still_further_specializable(&self) -> bool
impl
specialization. Read moreimpl<'tcx, N: Eq> Eq for ImplSource<'tcx, N>
impl<'tcx, N> StructuralEq for ImplSource<'tcx, N>
impl<'tcx, N> StructuralPartialEq for ImplSource<'tcx, N>
Auto Trait Implementations
impl<'tcx, N> !RefUnwindSafe for ImplSource<'tcx, N>
impl<'tcx, N> Send for ImplSource<'tcx, N>where
N: Send,
impl<'tcx, N> Sync for ImplSource<'tcx, N>where
N: Sync,
impl<'tcx, N> Unpin for ImplSource<'tcx, N>where
N: Unpin,
impl<'tcx, N> !UnwindSafe for ImplSource<'tcx, N>
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
sourceimpl<Ctxt, T> DepNodeParams<Ctxt> for Twhere
Ctxt: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
impl<Ctxt, T> DepNodeParams<Ctxt> for Twhere
Ctxt: DepContext,
T: for<'a> HashStable<StableHashingContext<'a>> + Debug,
default fn fingerprint_style() -> FingerprintStyle
sourcedefault fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint
default fn to_fingerprint(&self, tcx: Ctxt) -> Fingerprint
default fn to_debug_str(&self, Ctxt) -> String
sourcedefault fn recover(Ctxt, &DepNode<<Ctxt as DepContext>::DepKind>) -> Option<T>
default fn recover(Ctxt, &DepNode<<Ctxt as DepContext>::DepKind>) -> Option<T>
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. Read moresourceimpl<T, R> InternIteratorElement<T, R> for T
impl<T, R> InternIteratorElement<T, R> for T
type Output = R
fn intern_with<I, F>(iter: I, f: F) -> <T as InternIteratorElement<T, R>>::Outputwhere
I: Iterator<Item = T>,
F: FnOnce(&[T]) -> R,
sourceimpl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
sourceimpl<CTX, T> Value<CTX> for Twhere
CTX: DepContext,
impl<CTX, T> Value<CTX> for Twhere
CTX: DepContext,
default fn from_cycle_error(tcx: CTX) -> T
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
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: 72 bytes
Size for each variant:
UserDefined
: 47 bytesAutoImpl
: 39 bytesParam
: 31 bytesObject
: 63 bytesBuiltin
: 31 bytesTraitUpcasting
: 71 bytesClosure
: 47 bytesFnPointer
: 39 bytesDiscriminantKind
: 0 bytesPointee
: 0 bytesGenerator
: 47 bytesTraitAlias
: 47 bytesConstDestruct
: 31 bytesTuple
: 0 bytes