pub struct TraitRef<'tcx> {
pub def_id: DefId,
pub substs: &'tcx Substs<'tcx>,
}
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A complete reference to a trait. These take numerous guises in syntax,
but perhaps the most recognizable form is in a where clause:
T : Foo<U>
This would be represented by a trait-reference where the def-id is the
def-id for the trait Foo
and the substs define T
as parameter 0,
and U
as parameter 1.
Trait references also appear in object types like Foo<U>
, but in
that case the Self
parameter is absent from the substitutions.
Note that a TraitRef
introduces a level of region binding, to
account for higher-ranked trait bounds like T : for<'a> Foo<&'a U>
or higher-ranked object types.
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Returns a TraitRef of the form P0: Foo<P1..Pn>
where Pi
are the parameters defined on trait.
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fn relate<'a, 'gcx, R>( relation: &mut R, a: &TraitRef<'tcx>, b: &TraitRef<'tcx> ) -> RelateResult<'tcx, TraitRef<'tcx>> where R: TypeRelation<'a, 'gcx, 'tcx>, 'gcx: 'a + 'tcx, 'tcx: 'a, | [src] |
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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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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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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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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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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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🔬 This is a nightly-only experimental API. (rustc_private
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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
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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.
🔬 This is a nightly-only experimental API. (try_from
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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