Enum rustc_infer::infer::lexical_region_resolve::VarValue

pub(crate) enum VarValue<'tcx> {
    Empty(UniverseIndex),
    Value(Region<'tcx>),
    ErrorValue,
}

Variants

Empty(UniverseIndex)

Empty lifetime is for data that is never accessed. We tag the empty lifetime with a universe – the idea is that we don’t want exists<'a> { forall<'b> { 'b: 'a } } to be satisfiable. Therefore, the 'empty in a universe U is less than all regions visible from U, but not less than regions not visible from U.

Value(Region<'tcx>)

ErrorValue

Trait Implementations

impl<'tcx> Clone for VarValue<'tcx>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'tcx> Debug for VarValue<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> Copy for VarValue<'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: 16 bytes

Size for each variant:

• Empty: 4 bytes
• Value: 12 bytes
• ErrorValue: 0 bytes