Enum rustc::ty::Predicate [−] [src]

pub enum Predicate<'tcx> {
    Trait(PolyTraitPredicate<'tcx>),
    Rfc1592(Box<Predicate<'tcx>>),
    Equate(PolyEquatePredicate<'tcx>),
    RegionOutlives(PolyRegionOutlivesPredicate),
    TypeOutlives(PolyTypeOutlivesPredicate<'tcx>),
    Projection(PolyProjectionPredicate<'tcx>),
    WellFormed(Ty<'tcx>),
    ObjectSafe(DefId),
    ClosureKind(DefId, ClosureKind),
}
Unstable (rustc_private)

Variants

Trait(PolyTraitPredicate<'tcx>)
Unstable (rustc_private)

Corresponds to where Foo : Bar<A,B,C>. Foo here would be the Self type of the trait reference and A, B, and C would be the parameters in the TypeSpace.

Rfc1592(Box<Predicate<'tcx>>)
Unstable (rustc_private)

A predicate created by RFC1592

Equate(PolyEquatePredicate<'tcx>)
Unstable (rustc_private)

where T1 == T2.

RegionOutlives(PolyRegionOutlivesPredicate)
Unstable (rustc_private)

where 'a : 'b

TypeOutlives(PolyTypeOutlivesPredicate<'tcx>)
Unstable (rustc_private)

where T : 'a

Projection(PolyProjectionPredicate<'tcx>)
Unstable (rustc_private)

where ::Name == X, approximately. See ProjectionPredicate struct for details.

WellFormed(Ty<'tcx>)
Unstable (rustc_private)

no syntax: T WF

ObjectSafe(DefId)
Unstable (rustc_private)

trait must be object-safe

ClosureKind(DefId, ClosureKind)
Unstable (rustc_private)

No direct syntax. May be thought of as where T : FnFoo<...> for some 'TypeSpace' substitutions ... and T being a closure type. Satisfied (or refuted) once we know the closure's kind.

Methods

impl<'a, 'gcx, 'tcx> Predicate<'tcx>
[src]

fn subst_supertrait(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>, trait_ref: &PolyTraitRef<'tcx>) -> Predicate<'tcx>

Unstable (rustc_private)

Performs a substitution suitable for going from a poly-trait-ref to supertraits that must hold if that poly-trait-ref holds. This is slightly different from a normal substitution in terms of what happens with bound regions. See lengthy comment below for details.

impl<'tcx> Predicate<'tcx>
[src]

fn walk_tys(&self) -> IntoIter<Ty<'tcx>>

Unstable (rustc_private)

Iterates over the types in this predicate. Note that in all cases this is skipping over a binder, so late-bound regions with depth 0 are bound by the predicate.

fn to_opt_poly_trait_ref(&self) -> Option<PolyTraitRef<'tcx>>

Trait Implementations

impl<'a, 'tcx> Lift<'tcx> for Predicate<'a>
[src]

type Lifted = Predicate<'tcx>

fn lift_to_tcx<'b, 'gcx>(&self, tcx: TyCtxt<'b, 'gcx, 'tcx>) -> Option<Self::Lifted>

impl<'tcx> TypeFoldable<'tcx> for Predicate<'tcx>
[src]

fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self

fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(&self, folder: &mut F) -> Self

fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

fn has_regions_escaping_depth(&self, depth: u32) -> bool

fn has_escaping_regions(&self) -> bool

fn has_type_flags(&self, flags: TypeFlags) -> bool

fn has_projection_types(&self) -> bool

fn references_error(&self) -> bool

fn has_param_types(&self) -> bool

fn has_self_ty(&self) -> bool

fn has_infer_types(&self) -> bool

fn needs_infer(&self) -> bool

fn needs_subst(&self) -> bool

fn has_closure_types(&self) -> bool

fn has_erasable_regions(&self) -> bool

fn is_global(&self) -> bool

Indicates whether this value references only 'global' types/lifetimes that are the same regardless of what fn we are in. This is used for caching. Errs on the side of returning false. Read more

impl<'tcx> Debug for Predicate<'tcx>
[src]

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

Formats the value using the given formatter.

impl<'tcx> Display for Predicate<'tcx>
[src]

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

Formats the value using the given formatter.

Derived Implementations

impl<'tcx> Hash for Predicate<'tcx>
[src]

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

Feeds this value into the state given, updating the hasher as necessary.

fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher
1.3.0

Feeds a slice of this type into the state provided.

impl<'tcx> Eq for Predicate<'tcx>
[src]

impl<'tcx> PartialEq for Predicate<'tcx>
[src]

fn eq(&self, __arg_0: &Predicate<'tcx>) -> bool

This method tests for self and other values to be equal, and is used by ==. Read more

fn ne(&self, __arg_0: &Predicate<'tcx>) -> bool

This method tests for !=.

impl<'tcx> Clone for Predicate<'tcx>
[src]

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

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)
1.0.0

Performs copy-assignment from source. Read more