Struct ToArgRegionsFolder 

struct ToArgRegionsFolder<'a, 'tcx> {
    rcx: &'a RegionCtxt<'a, 'tcx>,
    erase_unknown_regions: bool,
    arg_regions: &'a [RegionVid],
}

A folder to map the regions in the hidden type to their corresponding arg_regions.

This folder has to differentiate between member regions and other regions in the hidden type. Member regions have to be equal to one of the arg_regions while other regions simply get treated as an existential region in the opaque if they are not. Existential regions are currently represented using 'erased.

Fields

rcx: &'a RegionCtxt<'a, 'tcx>

erase_unknown_regions: bool

arg_regions: &'a [RegionVid]

Implementations

impl<'a, 'tcx> ToArgRegionsFolder<'a, 'tcx>

fn new( rcx: &'a RegionCtxt<'a, 'tcx>, arg_regions: &'a [RegionVid], ) -> ToArgRegionsFolder<'a, 'tcx>

fn fold_non_member_arg(&mut self, arg: GenericArg<'tcx>) -> GenericArg<'tcx>

fn fold_closure_args( &mut self, def_id: DefId, args: GenericArgsRef<'tcx>, ) -> Result<GenericArgsRef<'tcx>, RegionVid>

Trait Implementations

impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for ToArgRegionsFolder<'_, 'tcx>

type Error = RegionVid

fn cx(&self) -> TyCtxt<'tcx>

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

fn try_fold_ty(&mut self, ty: Ty<'tcx>) -> Result<Ty<'tcx>, RegionVid>

fn try_fold_binder<T>( &mut self, t: Binder<I, T>, ) -> Result<Binder<I, T>, Self::Error>

where T: TypeFoldable<I>,

fn try_fold_const( &mut self, c: <I as Interner>::Const, ) -> Result<<I as Interner>::Const, Self::Error>

fn try_fold_predicate( &mut self, p: <I as Interner>::Predicate, ) -> Result<<I as Interner>::Predicate, Self::Error>

fn try_fold_clauses( &mut self, c: <I as Interner>::Clauses, ) -> Result<<I as Interner>::Clauses, Self::Error>

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: 32 bytes