Type Alias Canonical

pub type Canonical<'tcx, V> = Canonical<TyCtxt<'tcx>, V>;

Aliased Type

struct Canonical<'tcx, V> {
    pub value: V,
    pub max_universe: UniverseIndex,
    pub defining_opaque_types: &'tcx RawList<(), LocalDefId>,
    pub variables: &'tcx RawList<(), CanonicalVarInfo<TyCtxt<'tcx>>>,
}

Fields

value: V

max_universe: UniverseIndex

defining_opaque_types: &'tcx RawList<(), LocalDefId>

variables: &'tcx RawList<(), CanonicalVarInfo<TyCtxt<'tcx>>>

Trait Implementations

impl<'tcx, V> CanonicalExt<'tcx, V> for Canonical<'tcx, V>

fn instantiate( &self, tcx: TyCtxt<'tcx>, var_values: &CanonicalVarValues<'tcx>, ) -> V

where V: TypeFoldable<TyCtxt<'tcx>>,

Instantiate the wrapped value, replacing each canonical value with the value given in var_values.

fn instantiate_projected<T>( &self, tcx: TyCtxt<'tcx>, var_values: &CanonicalVarValues<'tcx>, projection_fn: impl FnOnce(&V) -> T, ) -> T

where T: TypeFoldable<TyCtxt<'tcx>>,

Allows one to apply a instantiation to some subset of self.value. Invoke projection_fn with self.value to get a value V that is expressed in terms of the same canonical variables bound in self (usually this extracts from subset of self). Apply the instantiation var_values to this value V, replacing each of the canonical variables.

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.