Enum rustc_middle::traits::ImplSource [−][src]
pub enum ImplSource<'tcx, N> { UserDefined(ImplSourceUserDefinedData<'tcx, N>), AutoImpl(ImplSourceAutoImplData<N>), Param(Vec<N>, Constness), Object(ImplSourceObjectData<'tcx, N>), Builtin(ImplSourceBuiltinData<N>), Closure(ImplSourceClosureData<'tcx, N>), FnPointer(ImplSourceFnPointerData<'tcx, N>), DiscriminantKind(ImplSourceDiscriminantKindData), Pointee(ImplSourcePointeeData), Generator(ImplSourceGeneratorData<'tcx, N>), TraitAlias(ImplSourceTraitAliasData<'tcx, N>), }
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: Vtable points at a specific impl. Only possible when // type is concretely known. If the impl itself has bounded // type parameters, Vtable will carry resolutions for those as well: concrete.clone(); // Vtable(Impl_1, [Vtable(Impl_2, [Vtable(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.
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.
Closure(ImplSourceClosureData<'tcx, N>)
ImplSource automatically generated for a closure. The DefId
is the ID
of the closure expression. This is a 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.
Implementations
impl<'tcx, N> ImplSource<'tcx, N>
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pub fn nested_obligations(self) -> Vec<N>
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pub fn borrow_nested_obligations(&self) -> &[N]ⓘ
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pub fn map<M, F>(self, f: F) -> ImplSource<'tcx, M> where
F: FnMut(N) -> M,
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F: FnMut(N) -> M,
Trait Implementations
impl<'tcx, N: Clone> Clone for ImplSource<'tcx, N>
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fn clone(&self) -> ImplSource<'tcx, N>
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pub fn clone_from(&mut self, source: &Self)
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impl<'tcx, N: Debug> Debug for ImplSource<'tcx, N>
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impl<'tcx, N, __D: TyDecoder<'tcx>> Decodable<__D> for ImplSource<'tcx, N> where
N: Decodable<__D>,
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N: Decodable<__D>,
impl<'tcx, N, __E: TyEncoder<'tcx>> Encodable<__E> for ImplSource<'tcx, N> where
N: Encodable<__E>,
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N: Encodable<__E>,
impl<'tcx, N: Eq> Eq for ImplSource<'tcx, N>
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impl<'tcx, '__ctx, N> HashStable<StableHashingContext<'__ctx>> for ImplSource<'tcx, N> where
N: HashStable<StableHashingContext<'__ctx>>,
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N: HashStable<StableHashingContext<'__ctx>>,
fn hash_stable(
&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
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&self,
__hcx: &mut StableHashingContext<'__ctx>,
__hasher: &mut StableHasher
)
impl<'tcx, '__lifted, N> Lift<'__lifted> for ImplSource<'tcx, N> where
N: Lift<'__lifted>,
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N: Lift<'__lifted>,
type Lifted = ImplSource<'__lifted, N::Lifted>
fn lift_to_tcx(
self,
__tcx: TyCtxt<'__lifted>
) -> Option<ImplSource<'__lifted, N::Lifted>>
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self,
__tcx: TyCtxt<'__lifted>
) -> Option<ImplSource<'__lifted, N::Lifted>>
impl<'tcx, N: PartialEq> PartialEq<ImplSource<'tcx, N>> for ImplSource<'tcx, N>
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fn eq(&self, other: &ImplSource<'tcx, N>) -> bool
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fn ne(&self, other: &ImplSource<'tcx, N>) -> bool
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impl<'tcx, N> StructuralEq for ImplSource<'tcx, N>
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impl<'tcx, N> StructuralPartialEq for ImplSource<'tcx, N>
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impl<'tcx, N> TypeFoldable<'tcx> for ImplSource<'tcx, N> where
N: TypeFoldable<'tcx>,
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N: TypeFoldable<'tcx>,
fn super_fold_with<__F: TypeFolder<'tcx>>(self, __folder: &mut __F) -> Self
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fn super_visit_with<__F: TypeVisitor<'tcx>>(
&self,
__folder: &mut __F
) -> ControlFlow<__F::BreakTy>
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&self,
__folder: &mut __F
) -> ControlFlow<__F::BreakTy>
fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self
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fn visit_with<V: TypeVisitor<'tcx>>(
&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
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&self,
visitor: &mut V
) -> ControlFlow<V::BreakTy>
fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool
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fn has_escaping_bound_vars(&self) -> bool
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fn has_type_flags(&self, flags: TypeFlags) -> bool
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fn has_projections(&self) -> bool
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fn has_opaque_types(&self) -> bool
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fn references_error(&self) -> bool
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fn has_param_types_or_consts(&self) -> bool
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fn has_infer_regions(&self) -> bool
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fn has_infer_types(&self) -> bool
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fn has_infer_types_or_consts(&self) -> bool
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fn needs_infer(&self) -> bool
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fn has_placeholders(&self) -> bool
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fn needs_subst(&self) -> bool
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fn has_free_regions(&self) -> bool
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fn has_erased_regions(&self) -> bool
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fn has_erasable_regions(&self) -> bool
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fn is_global(&self) -> bool
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fn has_late_bound_regions(&self) -> bool
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fn still_further_specializable(&self) -> bool
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Auto Trait Implementations
impl<'tcx, N> !RefUnwindSafe for ImplSource<'tcx, N>
impl<'tcx, N> !Send for ImplSource<'tcx, N>
impl<'tcx, N> !Sync for ImplSource<'tcx, N>
impl<'tcx, N> Unpin for ImplSource<'tcx, N> where
N: Unpin,
N: Unpin,
impl<'tcx, N> !UnwindSafe for ImplSource<'tcx, N>
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<'a, T> Captures<'a> for T where
T: ?Sized,
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T: ?Sized,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> MaybeResult<T> for T
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type Error = !
pub fn from(Result<T, <T as MaybeResult<T>>::Error>) -> T
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pub fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>
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impl<'tcx, T> Subst<'tcx> for T where
T: TypeFoldable<'tcx>,
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T: TypeFoldable<'tcx>,
pub fn subst_spanned(Self, TyCtxt<'tcx>, &[GenericArg<'tcx>], Option<Span>) -> T
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fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> Self
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.