Struct rustc_trait_selection::infer::InferCtxtBuilder

pub struct InferCtxtBuilder<'tcx> {
    tcx: TyCtxt<'tcx>,
    defining_use_anchor: DefiningAnchor<'tcx>,
    considering_regions: bool,
    skip_leak_check: bool,
    intercrate: bool,
    next_trait_solver: bool,
}

Used to configure inference contexts before their creation.

Fields

tcx: TyCtxt<'tcx>

defining_use_anchor: DefiningAnchor<'tcx>

considering_regions: bool

skip_leak_check: bool

intercrate: bool

next_trait_solver: bool

Implementations

impl<'tcx> InferCtxtBuilder<'tcx>

pub fn with_opaque_type_inference( self, defining_use_anchor: DefiningAnchor<'tcx> ) -> InferCtxtBuilder<'tcx>

Whenever the InferCtxt should be able to handle defining uses of opaque types, you need to call this function. Otherwise the opaque type will be treated opaquely.

It is only meant to be called in two places, for typeck (via Inherited::build) and for the inference context used in mir borrowck.

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

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

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

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

pub fn build_with_canonical<T>( &mut self, span: Span, canonical: &Canonical<TyCtxt<'tcx>, T> ) -> (InferCtxt<'tcx>, T, CanonicalVarValues<'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).

pub fn build(&mut self) -> InferCtxt<'tcx>

Trait Implementations

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

fn enter_canonical_trait_query<K, R>( self, canonical_key: &Canonical<'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>>.)

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: 24 bytes