pub enum Predicate<'tcx> {
Trait(PolyTraitPredicate<'tcx>),
RegionOutlives(PolyRegionOutlivesPredicate<'tcx>),
TypeOutlives(PolyTypeOutlivesPredicate<'tcx>),
Projection(PolyProjectionPredicate<'tcx>),
WellFormed(Ty<'tcx>),
ObjectSafe(DefId),
ClosureKind(DefId, ClosureSubsts<'tcx>, ClosureKind),
Subtype(PolySubtypePredicate<'tcx>),
ConstEvaluatable(DefId, &'tcx Substs<'tcx>),
}
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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 ::Name == X, approximately.
See ProjectionPredicate
struct for details.
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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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Constant initializer must evaluate successfully.
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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.
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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.
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Convert from the 'gcx
(lifted) form of Self
into the tcx
form of Self
. Read more
type Variant = Predicate<'tcx>
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type Lifted = Predicate<'tcx>
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True if self
has any late-bound regions that are either bound by binder
or bound by some binder outside of binder
. If binder
is ty::INNERMOST
, this indicates whether there are any late-bound regions that appear free. Read more
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True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
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"Free" regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more
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True if there any any un-erased free regions.
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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. Read more
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True if there are any late-bound regions
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A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
Performs copy-assignment from source
. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Feeds this value into the given [Hasher
]. Read more
Feeds a slice of this type into the given [Hasher
]. Read more
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Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
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type Owned = T
Creates owned data from borrowed data, usually by cloning. Read more
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recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String
. Read more
type Error = !
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The type returned in the event of a conversion error.
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Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
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The type returned in the event of a conversion error.
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Mutably borrows from an owned value. Read more
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this method will likely be replaced by an associated static
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S
is the encoder/decoder state type, T
is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more