Enum rustc::infer::canonical::Certainty [−][src]
pub enum Certainty { Proven, Ambiguous, }
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Indicates whether or not we were able to prove the query to be true.
Variants
Proven
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The query is known to be true, presuming that you apply the
given var_values
and the region-constraints are satisfied.
Ambiguous
🔬 This is a nightly-only experimental API. (rustc_private
)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
instead?
The query is not known to be true, but also not known to be
false. The var_values
represent either values that must
hold in order for the query to be true, or helpful tips that
might make it true. Currently rustc's trait solver cannot
distinguish the two (e.g., due to our preference for where
clauses over impls).
After some unifiations and things have been done, it makes sense to try and prove again -- of course, at that point, the canonical form will be different, making this a distinct query.
Methods
impl Certainty
[src]
impl Certainty
pub fn is_proven(&self) -> bool
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pub fn is_proven(&self) -> bool
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pub fn is_ambiguous(&self) -> bool
[src]
pub fn is_ambiguous(&self) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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Trait Implementations
impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Certainty
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impl<'a, 'tcx> HashStable<StableHashingContext<'a>> for Certainty
fn hash_stable<W: StableHasherResult>(
&self,
__ctx: &mut StableHashingContext<'a>,
__hasher: &mut StableHasher<W>
)
[src]
fn hash_stable<W: StableHasherResult>(
&self,
__ctx: &mut StableHashingContext<'a>,
__hasher: &mut StableHasher<W>
)
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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impl Copy for Certainty
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impl Copy for Certainty
impl Clone for Certainty
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impl Clone for Certainty
fn clone(&self) -> Certainty
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fn clone(&self) -> Certainty
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Debug for Certainty
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impl Debug for Certainty
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl<'tcx> TypeFoldable<'tcx> for Certainty
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impl<'tcx> TypeFoldable<'tcx> for Certainty
fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
_: &mut F
) -> Certainty
[src]
fn super_fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
_: &mut F
) -> Certainty
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fn super_visit_with<F: TypeVisitor<'tcx>>(&self, _: &mut F) -> bool
[src]
fn super_visit_with<F: TypeVisitor<'tcx>>(&self, _: &mut F) -> bool
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fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut F
) -> Self
[src]
fn fold_with<'gcx: 'tcx, F: TypeFolder<'gcx, 'tcx>>(
&self,
folder: &mut F
) -> Self
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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
[src]
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool
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fn has_regions_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
[src]
fn has_regions_bound_at_or_above(&self, binder: DebruijnIndex) -> bool
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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
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
[src]
fn has_regions_bound_above(&self, binder: DebruijnIndex) -> bool
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instead?
True if this self
has any regions that escape binder
(and hence are not bound by it). Read more
fn has_escaping_regions(&self) -> bool
[src]
fn has_escaping_regions(&self) -> bool
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fn has_type_flags(&self, flags: TypeFlags) -> bool
[src]
fn has_type_flags(&self, flags: TypeFlags) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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fn has_projections(&self) -> bool
[src]
fn has_projections(&self) -> bool
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)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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fn references_error(&self) -> bool
[src]
fn references_error(&self) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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fn has_param_types(&self) -> bool
[src]
fn has_param_types(&self) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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fn has_self_ty(&self) -> bool
[src]
fn has_self_ty(&self) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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fn has_infer_types(&self) -> bool
[src]
fn has_infer_types(&self) -> bool
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fn needs_infer(&self) -> bool
[src]
fn needs_infer(&self) -> bool
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fn has_skol(&self) -> bool
[src]
fn has_skol(&self) -> bool
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fn needs_subst(&self) -> bool
[src]
fn needs_subst(&self) -> bool
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fn has_re_skol(&self) -> bool
[src]
fn has_re_skol(&self) -> bool
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fn has_closure_types(&self) -> bool
[src]
fn has_closure_types(&self) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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fn has_free_regions(&self) -> bool
[src]
fn has_free_regions(&self) -> bool
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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
fn has_erasable_regions(&self) -> bool
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fn has_erasable_regions(&self) -> bool
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True if there any any un-erased free regions.
fn is_global(&self) -> bool
[src]
fn is_global(&self) -> bool
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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
fn has_late_bound_regions(&self) -> bool
[src]
fn has_late_bound_regions(&self) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
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True if there are any late-bound regions
fn visit_tys_shallow(
&self,
visit: impl FnMut(Ty<'tcx>) -> bool
) -> bool
[src]
fn visit_tys_shallow(
&self,
visit: impl FnMut(Ty<'tcx>) -> bool
) -> bool
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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
instead?
A visitor that does not recurse into types, works like fn walk_shallow
in Ty
.
impl<'tcx> Lift<'tcx> for Certainty
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impl<'tcx> Lift<'tcx> for Certainty
type Lifted = Self
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fn lift_to_tcx<'a, 'gcx>(&self, _: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self>
[src]
fn lift_to_tcx<'a, 'gcx>(&self, _: TyCtxt<'a, 'gcx, 'tcx>) -> Option<Self>
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)
this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml
instead?