[][src]Struct rustc::traits::fulfill::FulfillmentContext

pub struct FulfillmentContext<'tcx> {
    predicates: ObligationForest<PendingPredicateObligation<'tcx>>,
    register_region_obligations: bool,
}
🔬 This is a nightly-only experimental API. (rustc_private)

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The fulfillment context is used to drive trait resolution. It consists of a list of obligations that must be (eventually) satisfied. The job is to track which are satisfied, which yielded errors, and which are still pending. At any point, users can call select_where_possible, and the fulfillment context will try to do selection, retaining only those obligations that remain ambiguous. This may be helpful in pushing type inference along. Once all type inference constraints have been generated, the method select_all_or_error can be used to report any remaining ambiguous cases as errors.

Fields

🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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Methods

impl<'a, 'gcx, 'tcx> FulfillmentContext<'tcx>
[src]

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Creates a new fulfillment context.

🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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Attempts to select obligations using selcx.

Trait Implementations

impl<'tcx> TraitEngine<'tcx> for FulfillmentContext<'tcx>
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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"Normalize" a projection type <SomeType as SomeTrait>::X by creating a fresh type variable $0 as well as a projection predicate <SomeType as SomeTrait>::X == $0. When the inference engine runs, it will attempt to find an impl of SomeTrait or a where clause that lets us unify $0 with something concrete. If this fails, we'll unify $0 with projection_ty again.

🔬 This is a nightly-only experimental API. (rustc_private)

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Requires that ty must implement the trait with def_id in the given environment. This trait must not have any type parameters (except for Self).

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

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Important traits for Vec<u8>

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Auto Trait Implementations

impl<'tcx> !Send for FulfillmentContext<'tcx>

impl<'tcx> !Sync for FulfillmentContext<'tcx>

Blanket Implementations

impl<T> MaybeResult for T
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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impl<'a, T> Captures for T where
    T: ?Sized
[src]

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> Erased for T