Struct rustc_infer::infer::nll_relate::ScopeInstantiator

pub(in infer::nll_relate) struct ScopeInstantiator<'me, '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

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>

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

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

type BreakTy = !

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

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

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