# Struct rustc_middle::ty::context::TyCtxtFeed

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    pub struct TyCtxtFeed<'tcx, KEY: Copy> {
        pub tcx: TyCtxt<'tcx>,
        key: KEY,
    }

Expand description

This struct should only be created by `create_def`.

## Fields§

§`tcx: TyCtxt<'tcx>`§`key: KEY`

## Implementations§

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### impl<'tcx, KEY: Copy> TyCtxtFeed<'tcx, KEY>

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#### pub fn key(&self) -> KEY

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#### pub fn downgrade(self) -> Feed<'tcx, KEY>

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### impl<'tcx> TyCtxtFeed<'tcx, LocalDefId>

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#### pub fn def_id(&self) -> LocalDefId

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#### pub fn feed_owner_id(&self) -> TyCtxtFeed<'tcx, OwnerId>

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#### pub fn feed_hir(&self)

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### impl<'tcx, K: IntoQueryParam<LocalDefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn local_def_id_to_hir_id(self, value: ProvidedValue<'tcx>)

Returns HIR ID for the given `LocalDefId`.

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### impl<'tcx, K: IntoQueryParam<LocalDefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn opt_hir_owner_nodes(self, value: ProvidedValue<'tcx>)

Gives access to the HIR nodes and bodies inside `key` if it’s a HIR owner.

This can be conveniently accessed by methods on `tcx.hir()`. Avoid calling this query directly.

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### impl<'tcx, K: IntoQueryParam<OwnerId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn hir_attrs(self, value: ProvidedValue<'tcx>)

Gives access to the HIR attributes inside the HIR owner `key`.

This can be conveniently accessed by methods on `tcx.hir()`. Avoid calling this query directly.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn type_of(self, value: ProvidedValue<'tcx>)

Returns the `Ty` of the given `DefId`. If the `DefId` points to an alias, it will “skip” this alias to return the aliased type.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn is_type_alias_impl_trait(self, value: ProvidedValue<'tcx>)

[query description - consider adding a doc-comment!] determine whether the opaque is a type-alias impl trait

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn generics_of(self, value: ProvidedValue<'tcx>)

Maps from the `DefId` of an item (trait/struct/enum/fn) to its associated generics.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn explicit_item_bounds(self, value: ProvidedValue<'tcx>)

Returns the list of bounds that are required to be satsified by a implementation or definition. For associated types, these must be satisfied for an implementation to be well-formed, and for opaque types, these are required to be satisfied by the hidden-type of the opaque.

Syntactially, these are the bounds written on the trait’s type definition, or those after the `impl` keyword for an opaque:

ⓘ

    type X: Bound + 'lt
    //      ^^^^^^^^^^^
    impl Debug + Display
    //   ^^^^^^^^^^^^^^^

`key` is the `DefId` of the associated type or opaque type.

Bounds from the parent (e.g. with nested impl trait) are not included.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn explicit_item_super_predicates(self, value: ProvidedValue<'tcx>)

The set of item bounds (see `TyCtxt::explicit_item_bounds`) that share the `Self` type of the item. These are a subset of the bounds that may explicitly be used for things like closure signature deduction.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn explicit_predicates_of(self, value: ProvidedValue<'tcx>)

Returns the predicates written explicitly by the user.

You should probably use `predicates_of` unless you’re looking for predicates with explicit spans for diagnostics purposes.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn inferred_outlives_of(self, value: ProvidedValue<'tcx>)

Returns the inferred outlives predicates (e.g., for `struct Foo<'a, T> { x: &'a T }`, this would return `T: 'a`).

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn associated_item(self, value: ProvidedValue<'tcx>)

Maps from a trait/impl item to the trait/impl item “descriptor”.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn eval_static_initializer(self, value: ProvidedValue<'tcx>)

Evaluate a static’s initializer, returning the allocation of the initializer’s memory.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn def_kind(self, value: ProvidedValue<'tcx>)

[query description - consider adding a doc-comment!] looking up definition kind of `tcx.def_path_str(def_id)`

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn def_span(self, value: ProvidedValue<'tcx>)

Gets the span for the definition.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn def_ident_span(self, value: ProvidedValue<'tcx>)

Gets the span for the identifier of the definition.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn codegen_fn_attrs(self, value: ProvidedValue<'tcx>)

[query description - consider adding a doc-comment!] computing codegen attributes of `tcx.def_path_str(def_id)`

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn param_env(self, value: ProvidedValue<'tcx>)

Gets the ParameterEnvironment for a given item; this environment will be in “user-facing” mode, meaning that it is suitable for type-checking etc, and it does not normalize specializable associated types. This is almost always what you want, unless you are doing MIR optimizations, in which case you might want to use `reveal_all()` method to change modes.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn defaultness(self, value: ProvidedValue<'tcx>)

Returns whether the impl or associated function has the `default` keyword.

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### impl<'tcx, K: IntoQueryParam<DefId> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn visibility(self, value: ProvidedValue<'tcx>)

Computes the visibility of the provided `def_id`.

If the item from the `def_id` doesn’t have a visibility, it will panic. For example a generic type parameter will panic if you call this method on it:

    use std::fmt::Debug;

    pub trait Foo<T: Debug> {}

In here, if you call `visibility` on `T`, it’ll panic.

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### impl<'tcx, K: IntoQueryParam<CrateNum> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn crate_name(self, value: ProvidedValue<'tcx>)

Gets the name of the crate.

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### impl<'tcx, K: IntoQueryParam<()> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn output_filenames(self, value: ProvidedValue<'tcx>)

Return the filenames where output artefacts shall be stored.

This query returns an `&Arc` because codegen backends need the value even after the `TyCtxt` has been destroyed.

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### impl<'tcx, K: IntoQueryParam<()> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn features_query(self, value: ProvidedValue<'tcx>)

[query description - consider adding a doc-comment!] looking up enabled feature gates

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### impl<'tcx, K: IntoQueryParam<()> + Copy> TyCtxtFeed<'tcx, K>

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#### pub fn crate_for_resolver(self, value: ProvidedValue<'tcx>)

[query description - consider adding a doc-comment!] the ast before macro expansion and name resolution

## Trait Implementations§

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### impl<'tcx, KEY: Clone + Copy> Clone for TyCtxtFeed<'tcx, KEY>

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#### fn clone(&self) -> TyCtxtFeed<'tcx, KEY>

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl<KEY: Copy, CTX> !HashStable<CTX> for TyCtxtFeed<'_, KEY>

Never return a `Feed` from a query. Only queries that create a `DefId` are allowed to feed queries for that `DefId`.

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#### fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)

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### impl<'tcx, KEY: Copy + Copy> Copy for TyCtxtFeed<'tcx, KEY>

## Auto Trait Implementations§

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### impl<'tcx, KEY> DynSend for TyCtxtFeed<'tcx, KEY>
where KEY: DynSend,

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### impl<'tcx, KEY> DynSync for TyCtxtFeed<'tcx, KEY>
where KEY: DynSync,

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### impl<'tcx, KEY> Freeze for TyCtxtFeed<'tcx, KEY>
where KEY: Freeze,

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### impl<'tcx, KEY> !RefUnwindSafe for TyCtxtFeed<'tcx, KEY>

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### impl<'tcx, KEY> !Send for TyCtxtFeed<'tcx, KEY>

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### impl<'tcx, KEY> !Sync for TyCtxtFeed<'tcx, KEY>

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### impl<'tcx, KEY> Unpin for TyCtxtFeed<'tcx, KEY>
where KEY: Unpin,

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### impl<'tcx, KEY> !UnwindSafe for TyCtxtFeed<'tcx, KEY>

## Blanket Implementations§

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### impl<T> Aligned for T

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#### const ALIGN: Alignment = _

Alignment of `Self`.
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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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#### fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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#### fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'a mut [T]

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### impl<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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#### fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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#### fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'a mut [T]

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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> CloneToUninit for T
where T: Copy,

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#### unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dst`. Read more
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### impl<T> CloneToUninit for T
where T: Clone,

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#### default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dst`. Read more
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### impl<T, R> CollectAndApply<T, R> for T

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#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to `f(&iter.collect::<Vec<_>>())`.

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#### type Output = R

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### impl<T> Filterable for T

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#### fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> IntoEither for T

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#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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### impl<P> IntoQueryParam<P> for P

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#### fn into_query_param(self) -> P

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### impl<T> MaybeResult<T> for T

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#### type Error = !

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#### fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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#### fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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### impl<T> Pointable for T

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#### const ALIGN: usize = _

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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### impl<T> Same for T

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#### type Output = T

Should always be `Self`
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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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#### fn upcast(self, interner: I) -> U

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### impl<I, T> UpcastFrom<I, T> for T

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#### fn upcast_from(from: T, _tcx: I) -> T

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### impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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#### fn vzip(self) -> V

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### impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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#### default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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### impl<'a, T> Captures<'a> for T
where T: ?Sized,

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### impl<T> ErasedDestructor for T
where T: 'static,

## Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.