CanonicalizeMode in rustc_next_trait_solver::canonical::canonicalizer - Rust
Description: Whether we’re canonicalizing a query input or the query response.

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## CanonicalizeMode

# Enum CanonicalizeMode

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    enum CanonicalizeMode {
        Input(CanonicalizeInputKind),
        Response {
            max_input_universe: UniverseIndex,
        },
    }

Expand description

Whether we’re canonicalizing a query input or the query response.

When canonicalizing an input we’re in the context of the caller while canonicalizing the response happens in the context of the query.

## Variants§

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### Input(CanonicalizeInputKind)

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### Response

FIXME: We currently return region constraints referring to placeholders and inference variables from a binder instantiated inside of the query.

In the long term we should eagerly deal with these constraints inside of the query and only propagate constraints which are actually nameable by the caller.

#### Fields

§`max_input_universe: UniverseIndex`

The highest universe nameable by the caller.

All variables in a universe nameable by the caller get mapped to the root universe in the response and then mapped back to their correct universe when applying the query response in the context of the caller.

This doesn’t work for universes created inside of the query so we do remember their universe in the response.

## Trait Implementations§

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### impl Clone for CanonicalizeMode

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#### fn clone(&self) -> CanonicalizeMode

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Copy for CanonicalizeMode

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### impl Debug for CanonicalizeMode

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl DynSend for CanonicalizeMode

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### impl DynSync for CanonicalizeMode

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### impl Freeze for CanonicalizeMode

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### impl RefUnwindSafe for CanonicalizeMode

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### impl Send for CanonicalizeMode

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### impl Sync for CanonicalizeMode

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### impl Unpin for CanonicalizeMode

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### impl UnsafeUnpin for CanonicalizeMode

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### impl UnwindSafe for CanonicalizeMode

## 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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where T: ?Sized,

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

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### impl<T> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. 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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where T: 'static,

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

Instruments this type with the provided `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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#### 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<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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Mutably dereferences 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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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
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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 with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

## 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:

- `Input`: 1 byte
- `Response`: 7 bytes