Enum rustc::ty::Predicate [] [src]

pub enum Predicate<'tcx> {
    Trait(PolyTraitPredicate<'tcx>),
    Equate(PolyEquatePredicate<'tcx>),
    RegionOutlives(PolyRegionOutlivesPredicate<'tcx>),
    TypeOutlives(PolyTypeOutlivesPredicate<'tcx>),
    Projection(PolyProjectionPredicate<'tcx>),
    WellFormed(Ty<'tcx>),
    ObjectSafe(DefId),
    ClosureKind(DefIdClosureKind),
    Subtype(PolySubtypePredicate<'tcx>),
    ConstEvaluatable(DefId, &'tcx Substs<'tcx>),
}
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Variants

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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 type parameters.

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where T1 == T2.

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where 'a : 'b

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where T : 'a

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

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no syntax: T WF

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trait must be object-safe

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

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T1 <: T2

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Constant initializer must evaluate successfully.

Methods

impl<'a, 'gcx, 'tcx> Predicate<'tcx>
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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>
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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.

[src]

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Trait Implementations

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

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

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[src]

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[src]

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[src]

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[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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[src]

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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> Clone for Predicate<'tcx>
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl<'tcx> Copy for Predicate<'tcx>
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impl<'tcx> PartialEq for Predicate<'tcx>
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'tcx> Eq for Predicate<'tcx>
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impl<'tcx> Hash for Predicate<'tcx>
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl<'tcx> Encodable for Predicate<'tcx>
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impl<'tcx> Decodable for Predicate<'tcx>
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impl<'tcx> Print for Predicate<'tcx>
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[src]

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[src]

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[src]

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[src]

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impl<'tcx> Display for Predicate<'tcx>
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Formats the value using the given formatter. Read more

impl<'tcx> Debug for Predicate<'tcx>
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Formats the value using the given formatter.