Enum rustc_trait_selection::traits::query::OutlivesBound

pub enum OutlivesBound<'tcx> {
    RegionSubRegion(Region<'tcx>, Region<'tcx>),
    RegionSubParam(Region<'tcx>, ParamTy),
    RegionSubAlias(Region<'tcx>, AliasTy<'tcx>),
}

Outlives bounds are relationships between generic parameters, whether they both be regions ('a: 'b) or whether types are involved (T: 'a). These relationships can be extracted from the full set of predicates we understand or also from types (in which case they are called implied bounds). They are fed to the OutlivesEnv which in turn is supplied to the region checker and other parts of the inference system.

Variants

RegionSubRegion(Region<'tcx>, Region<'tcx>)

RegionSubParam(Region<'tcx>, ParamTy)

RegionSubAlias(Region<'tcx>, AliasTy<'tcx>)

Trait Implementations

impl<'tcx> Clone for OutlivesBound<'tcx>

fn clone(&self) -> OutlivesBound<'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Debug for OutlivesBound<'tcx>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for OutlivesBound<'tcx>

fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for OutlivesBound<'tcx>

fn try_fold_with<__F>( self, __folder: &mut __F ) -> Result<OutlivesBound<'tcx>, <__F as FallibleTypeFolder<TyCtxt<'tcx>>>::Error>

where __F: FallibleTypeFolder<TyCtxt<'tcx>>,

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F>(self, folder: &mut F) -> Self

where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for OutlivesBound<'tcx>

fn visit_with<__V>( &self, __visitor: &mut __V ) -> <__V as TypeVisitor<TyCtxt<'tcx>>>::Result

where __V: TypeVisitor<TyCtxt<'tcx>>,

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

impl<'tcx> Copy for OutlivesBound<'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

Size for each variant:

• RegionSubRegion: 24 bytes
• RegionSubParam: 24 bytes
• RegionSubAlias: 24 bytes