Enum rustc_trait_selection::traits::query::OutlivesBound

source · [−]
pub enum OutlivesBound<'tcx> {
    RegionSubRegion(Region<'tcx>, Region<'tcx>),
    RegionSubParam(Region<'tcx>, ParamTy),
    RegionSubProjection(Region<'tcx>, ProjectionTy<'tcx>),
}
Expand description

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)

RegionSubProjection(Region<'tcx>, ProjectionTy<'tcx>)

Auto Trait Implementations

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Returns the argument unchanged.

Calls U::from(self).

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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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: 16 bytes
  • RegionSubParam: 16 bytes
  • RegionSubProjection: 24 bytes