rustc_trait_selection::infer

Struct InferCtxtBuilder

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pub struct InferCtxtBuilder<'tcx> {
    tcx: TyCtxt<'tcx>,
    considering_regions: bool,
    skip_leak_check: bool,
    next_trait_solver: bool,
}
Expand description

Used to configure inference contexts before their creation.

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§tcx: TyCtxt<'tcx>§considering_regions: bool§skip_leak_check: bool§next_trait_solver: bool

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impl<'tcx> InferCtxtBuilder<'tcx>

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pub fn with_next_trait_solver( self, next_trait_solver: bool, ) -> InferCtxtBuilder<'tcx>

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pub fn ignoring_regions(self) -> InferCtxtBuilder<'tcx>

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pub fn skip_leak_check(self, skip_leak_check: bool) -> InferCtxtBuilder<'tcx>

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pub fn build_with_canonical<T>( self, span: Span, input: &CanonicalQueryInput<TyCtxt<'tcx>, T>, ) -> (InferCtxt<'tcx>, T, CanonicalVarValues<TyCtxt<'tcx>>)
where T: TypeFoldable<TyCtxt<'tcx>>,

Given a canonical value C as a starting point, create an inference context that contains each of the bound values within instantiated as a fresh variable. The f closure is invoked with the new infcx, along with the instantiated value V and a instantiation S. This instantiation S maps from the bound values in C to their instantiated values in V (in other words, S(C) = V).

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pub fn build_with_typing_env( self, _: TypingEnv<'tcx>, ) -> (InferCtxt<'tcx>, ParamEnv<'tcx>)

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pub fn build( &mut self, typing_mode: TypingMode<TyCtxt<'tcx>>, ) -> InferCtxt<'tcx>

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impl<'tcx> InferCtxtBuilderExt<'tcx> for InferCtxtBuilder<'tcx>

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fn enter_canonical_trait_query<K, R>( self, canonical_key: &CanonicalQueryInput<'tcx, K>, operation: impl FnOnce(&ObligationCtxt<'_, 'tcx>, K) -> Result<R, NoSolution>, ) -> Result<CanonicalQueryResponse<'tcx, R>, NoSolution>
where K: TypeFoldable<TyCtxt<'tcx>>, R: Debug + TypeFoldable<TyCtxt<'tcx>>, Canonical<'tcx, QueryResponse<'tcx, R>>: ArenaAllocatable<'tcx>,

The “main method” for a canonicalized trait query. Given the canonical key canonical_key, this method will create a new inference context, instantiate the key, and run your operation op. The operation should yield up a result (of type R) as well as a set of trait obligations that must be fully satisfied. These obligations will be processed and the canonical result created.

Returns NoSolution in the event of any error.

(It might be mildly nicer to implement this on TyCtxt, and not InferCtxtBuilder, but that is a bit tricky right now. In part because we would need a for<'tcx> sort of bound for the closure and in part because it is convenient to have 'tcx be free on this function so that we can talk about K: TypeFoldable<TyCtxt<'tcx>>.)

Auto Trait Implementations§

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impl<'tcx> DynSend for InferCtxtBuilder<'tcx>

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impl<'tcx> DynSync for InferCtxtBuilder<'tcx>

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impl<'tcx> Freeze for InferCtxtBuilder<'tcx>

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impl<'tcx> !RefUnwindSafe for InferCtxtBuilder<'tcx>

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

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

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impl<'tcx> Unpin for InferCtxtBuilder<'tcx>

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impl<'tcx> !UnwindSafe for InferCtxtBuilder<'tcx>

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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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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Immutably borrows from an owned value. Read more
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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, 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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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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fn from(t: T) -> 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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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>
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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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type Error = !

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

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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: 16 bytes