# Struct rustc_borrowck::type_check::constraint_conversion::ConstraintConversion

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    pub(crate) struct ConstraintConversion<'a, 'tcx> {
        infcx: &'a InferCtxt<'tcx>,
        tcx: TyCtxt<'tcx>,
        universal_regions: &'a UniversalRegions<'tcx>,
        region_bound_pairs: &'a RegionBoundPairs<'tcx>,
        implicit_region_bound: Region<'tcx>,
        param_env: ParamEnv<'tcx>,
        known_type_outlives_obligations: &'tcx [PolyTypeOutlivesPredicate<'tcx>],
        locations: Locations,
        span: Span,
        category: ConstraintCategory<'tcx>,
        from_closure: bool,
        constraints: &'a mut MirTypeckRegionConstraints<'tcx>,
    }

## Fields§

§`infcx: &'a InferCtxt<'tcx>`§`tcx: TyCtxt<'tcx>`§`universal_regions: &'a UniversalRegions<'tcx>`§`region_bound_pairs: &'a RegionBoundPairs<'tcx>`

Each RBP `GK: 'a` is assumed to be true. These encode relationships like `T: 'a` that are added via implicit bounds or the `param_env`.

Each region here is guaranteed to be a key in the `indices` map. We use the “original” regions (i.e., the keys from the map, and not the values) because the code in `process_registered_region_obligations` has some special-cased logic expecting to see (e.g.) `ReStatic`, and if we supplied our special inference variable there, we would mess that up.

§`implicit_region_bound: Region<'tcx>`§`param_env: ParamEnv<'tcx>`§`known_type_outlives_obligations: &'tcx [PolyTypeOutlivesPredicate<'tcx>]`§`locations: Locations`§`span: Span`§`category: ConstraintCategory<'tcx>`§`from_closure: bool`§`constraints: &'a mut MirTypeckRegionConstraints<'tcx>`

## Implementations§

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### impl<'a, 'tcx> ConstraintConversion<'a, 'tcx>

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#### pub(crate) fn new( infcx: &'a InferCtxt<'tcx>, universal_regions: &'a UniversalRegions<'tcx>, region_bound_pairs: &'a RegionBoundPairs<'tcx>, implicit_region_bound: Region<'tcx>, param_env: ParamEnv<'tcx>, known_type_outlives_obligations: &'tcx [PolyTypeOutlivesPredicate<'tcx>], locations: Locations, span: Span, category: ConstraintCategory<'tcx>, constraints: &'a mut MirTypeckRegionConstraints<'tcx> ) -> Self

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#### pub(super) fn convert_all( &mut self, query_constraints: &QueryRegionConstraints<'tcx> )

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#### pub fn apply_closure_requirements( &mut self, closure_requirements: &ClosureRegionRequirements<'tcx>, closure_def_id: DefId, closure_args: GenericArgsRef<'tcx> )

Given an instance of the closure type, this method instantiates the “extra” requirements that we computed for the closure. This has the effect of adding new outlives obligations to existing region variables in `closure_args`.

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#### fn convert( &mut self, predicate: OutlivesPredicate<GenericArg<'tcx>, Region<'tcx>>, constraint_category: ConstraintCategory<'tcx> )

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#### fn replace_placeholders_with_nll<T: TypeFoldable<TyCtxt<'tcx>>>( &mut self, value: T ) -> T

Placeholder regions need to be converted eagerly because it may create new region variables, which we must not do when verifying our region bounds.

FIXME: This should get removed once higher ranked region obligations are dealt with during trait solving.

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#### fn verify_to_type_test( &mut self, generic_kind: GenericKind<'tcx>, region: Region<'tcx>, verify_bound: VerifyBound<'tcx> ) -> TypeTest<'tcx>

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#### fn to_region_vid(&mut self, r: Region<'tcx>) -> RegionVid

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#### fn add_outlives( &mut self, sup: RegionVid, sub: RegionVid, category: ConstraintCategory<'tcx> )

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#### fn add_type_test(&mut self, type_test: TypeTest<'tcx>)

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#### fn normalize_and_add_type_outlives_constraints( &self, ty: Ty<'tcx>, next_outlives_predicates: &mut Vec<(OutlivesPredicate<GenericArg<'tcx>, Region<'tcx>>, ConstraintCategory<'tcx>)> ) -> Ty<'tcx>

## Trait Implementations§

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### impl<'a, 'b, 'tcx> TypeOutlivesDelegate<'tcx> for &'a mut ConstraintConversion<'b, 'tcx>

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#### fn push_sub_region_constraint( &mut self, _origin: SubregionOrigin<'tcx>, a: Region<'tcx>, b: Region<'tcx>, constraint_category: ConstraintCategory<'tcx> )

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#### fn push_verify( &mut self, _origin: SubregionOrigin<'tcx>, kind: GenericKind<'tcx>, a: Region<'tcx>, bound: VerifyBound<'tcx> )

## Auto Trait Implementations§

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### impl<'a, 'tcx> !DynSend for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> !DynSync for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> Freeze for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> !RefUnwindSafe for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> !Send for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> !Sync for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> Unpin for ConstraintConversion<'a, 'tcx>

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### impl<'a, 'tcx> !UnwindSafe for ConstraintConversion<'a, 'tcx>

## Blanket Implementations§

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### impl<T> Aligned for T

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#### const ALIGN: Alignment = _

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### impl<T> Any for T
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#### fn collect_and_apply<I, F>(iter: I, f: F) -> R
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#### type Output = R

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

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

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

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#### type Error = !

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#### const ALIGN: usize = _

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## 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: 120 bytes