Struct rustc_infer::infer::nll_relate::ScopeInstantiator

struct ScopeInstantiator<'me, 'tcx> {
    tcx: TyCtxt<'tcx>,
    next_region: &'me mut dyn FnMut(BoundRegion) -> Region<'tcx>,
    target_index: DebruijnIndex,
    bound_region_scope: &'me mut BoundRegionScope<'tcx>,
}

When we encounter a binder like for<..> fn(..), we actually have to walk the fn value to find all the values bound by the for (these are not explicitly present in the ty representation right now). This visitor handles that: it descends the type, tracking binder depth, and finds late-bound regions targeting the for<..>. For each of those, it creates an entry in bound_region_scope.

Fields

tcx: TyCtxt<'tcx>

next_region: &'me mut dyn FnMut(BoundRegion) -> Region<'tcx>

target_index: DebruijnIndex

bound_region_scope: &'me mut BoundRegionScope<'tcx>

Trait Implementations

impl<'me, 'tcx> TypeVisitor<'tcx> for ScopeInstantiator<'me, 'tcx>

fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>>

Supplies the tcx for an unevaluated anonymous constant in case its default substs are not yet supplied.

fn visit_binder<T: TypeFoldable<'tcx>>(
    &mut self,
    t: &Binder<'tcx, T>
) -> ControlFlow<Self::BreakTy>

fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy>

type BreakTy = !

fn visit_ty(&mut self, t: &'tcx TyS<'tcx>) -> ControlFlow<Self::BreakTy, ()>

fn visit_const(
    &mut self,
    c: &'tcx Const<'tcx>
) -> ControlFlow<Self::BreakTy, ()>

fn visit_unevaluated_const(
    &mut self,
    uv: Unevaluated<'tcx, Option<Promoted>>
) -> ControlFlow<Self::BreakTy, ()>

fn visit_predicate(
    &mut self,
    p: Predicate<'tcx>
) -> ControlFlow<Self::BreakTy, ()>

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: 40 bytes