Enum chalk_ir::DomainGoal
source · [−]pub enum DomainGoal<I: Interner> {
Holds(WhereClause<I>),
WellFormed(WellFormed<I>),
FromEnv(FromEnv<I>),
Normalize(Normalize<I>),
IsLocal(Ty<I>),
IsUpstream(Ty<I>),
IsFullyVisible(Ty<I>),
LocalImplAllowed(TraitRef<I>),
Compatible,
DownstreamType(Ty<I>),
Reveal,
ObjectSafe(TraitId<I>),
}
Expand description
A “domain goal” is a goal that is directly about Rust, rather than a pure logical statement. As much as possible, the Chalk solver should avoid decomposing this enum, and instead treat its values opaquely.
Variants
Holds(WhereClause<I>)
Simple goal that is true if the where clause is true.
WellFormed(WellFormed<I>)
True if the type or trait ref is well-formed.
FromEnv(FromEnv<I>)
True if the trait ref can be derived from in-scope where clauses.
Normalize(Normalize<I>)
True if the alias type can be normalized to some other type
IsLocal(Ty<I>)
True if a type is considered to have been “defined” by the current crate. This is true for
a struct Foo { }
but false for a #[upstream] struct Foo { }
. However, for fundamental types
like Box<T>
, it is true if T
is local.
IsUpstream(Ty<I>)
True if a type is not considered to have been “defined” by the current crate. This is
false for a struct Foo { }
but true for a #[upstream] struct Foo { }
. However, for
fundamental types like Box<T>
, it is true if T
is upstream.
IsFullyVisible(Ty<I>)
True if a type and its input types are fully visible, known types. That is, there are no unknown type parameters anywhere in this type.
More formally, for each struct S<P0..Pn>: forall<P0..Pn> { IsFullyVisible(S<P0…Pn>) :- IsFullyVisible(P0), … IsFullyVisible(Pn) }
Note that any of these types can have lifetimes in their parameters too, but we only consider type parameters.
LocalImplAllowed(TraitRef<I>)
Used to dictate when trait impls are allowed in the current (local) crate based on the orphan rules.
LocalImplAllowed(T: Trait)
is true if the type T is allowed to impl trait Trait in
the current crate. Under the current rules, this is unconditionally true for all types if
the Trait is considered to be “defined” in the current crate. If that is not the case, then
LocalImplAllowed(T: Trait)
can still be true if IsLocal(T)
is true.
Compatible
Used to activate the “compatible modality” rules. Rules that introduce predicates that have to do with “all compatible universes” should depend on this clause so that they only apply if this is present.
DownstreamType(Ty<I>)
Used to indicate that a given type is in a downstream crate. Downstream crates contain the current crate at some level of their dependencies.
Since chalk does not actually see downstream types, this is usually introduced with implication on a fresh, universally quantified type.
forall
This makes a new type T
available and makes DownstreamType(T)
provable for that type.
Reveal
Used to activate the “reveal mode”, in which opaque (impl Trait
) types can be equated
to their actual type.
ObjectSafe(TraitId<I>)
Used to indicate that a trait is object safe.
Implementations
sourceimpl<I: Interner> DomainGoal<I>
impl<I: Interner> DomainGoal<I>
sourcepub fn into_from_env_goal(self, interner: I) -> DomainGoal<I>
pub fn into_from_env_goal(self, interner: I) -> DomainGoal<I>
Convert Implemented(...)
into FromEnv(...)
, but leave other
goals unchanged.
sourcepub fn inputs(&self, interner: I) -> Vec<GenericArg<I>>
pub fn inputs(&self, interner: I) -> Vec<GenericArg<I>>
Lists generic arguments that are inputs to this domain goal.
Trait Implementations
sourceimpl<I: Interner> CastTo<DomainGoal<I>> for DomainGoal<I>
impl<I: Interner> CastTo<DomainGoal<I>> for DomainGoal<I>
sourcefn cast_to(
self,
_interner: <DomainGoal<I> as HasInterner>::Interner
) -> DomainGoal<I>
fn cast_to(
self,
_interner: <DomainGoal<I> as HasInterner>::Interner
) -> DomainGoal<I>
Cast a value to type T
.
sourceimpl<I: Interner> CastTo<DomainGoal<I>> for FromEnv<I>
impl<I: Interner> CastTo<DomainGoal<I>> for FromEnv<I>
sourcefn cast_to(self, _interner: I) -> DomainGoal<I>
fn cast_to(self, _interner: I) -> DomainGoal<I>
Cast a value to type T
.
sourceimpl<I: Interner> CastTo<DomainGoal<I>> for Normalize<I>
impl<I: Interner> CastTo<DomainGoal<I>> for Normalize<I>
sourcefn cast_to(self, _interner: I) -> DomainGoal<I>
fn cast_to(self, _interner: I) -> DomainGoal<I>
Cast a value to type T
.
sourceimpl<I: Interner> CastTo<DomainGoal<I>> for WellFormed<I>
impl<I: Interner> CastTo<DomainGoal<I>> for WellFormed<I>
sourcefn cast_to(self, _interner: I) -> DomainGoal<I>
fn cast_to(self, _interner: I) -> DomainGoal<I>
Cast a value to type T
.
sourceimpl<I: Clone + Interner> Clone for DomainGoal<I>
impl<I: Clone + Interner> Clone for DomainGoal<I>
sourcefn clone(&self) -> DomainGoal<I>
fn clone(&self) -> DomainGoal<I>
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl<I: Interner> CouldMatch<DomainGoal<I>> for ProgramClause<I>
impl<I: Interner> CouldMatch<DomainGoal<I>> for ProgramClause<I>
sourcefn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &DomainGoal<I>
) -> bool
fn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &DomainGoal<I>
) -> bool
Checks whether self
and other
could possibly match.
sourceimpl<I: Interner> CouldMatch<DomainGoal<I>> for ProgramClauseData<I>
impl<I: Interner> CouldMatch<DomainGoal<I>> for ProgramClauseData<I>
sourcefn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &DomainGoal<I>
) -> bool
fn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &DomainGoal<I>
) -> bool
Checks whether self
and other
could possibly match.
sourceimpl<I: Interner> Debug for DomainGoal<I>
impl<I: Interner> Debug for DomainGoal<I>
sourceimpl<I: Interner> HasInterner for DomainGoal<I>
impl<I: Interner> HasInterner for DomainGoal<I>
type Interner = I
type Interner = I
The interner associated with the type.
sourceimpl<I: Hash + Interner> Hash for DomainGoal<I>
impl<I: Hash + Interner> Hash for DomainGoal<I>
sourceimpl<I: PartialEq + Interner> PartialEq<DomainGoal<I>> for DomainGoal<I>
impl<I: PartialEq + Interner> PartialEq<DomainGoal<I>> for DomainGoal<I>
sourcefn eq(&self, other: &DomainGoal<I>) -> bool
fn eq(&self, other: &DomainGoal<I>) -> bool
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
sourcefn ne(&self, other: &DomainGoal<I>) -> bool
fn ne(&self, other: &DomainGoal<I>) -> bool
This method tests for !=
.
sourceimpl<I: Interner> TypeFoldable<I> for DomainGoal<I>
impl<I: Interner> TypeFoldable<I> for DomainGoal<I>
sourcefn fold_with<E>(
self,
folder: &mut dyn TypeFolder<I, Error = E>,
outer_binder: DebruijnIndex
) -> Result<Self, E>
fn fold_with<E>(
self,
folder: &mut dyn TypeFolder<I, Error = E>,
outer_binder: DebruijnIndex
) -> Result<Self, E>
Apply the given folder folder
to self
; binders
is the
number of binders that are in scope when beginning the
folder. Typically binders
starts as 0, but is adjusted when
we encounter Binders<T>
in the IR or other similar
constructs. Read more
sourceimpl<I: Interner> TypeSuperVisitable<I> for DomainGoal<I>
impl<I: Interner> TypeSuperVisitable<I> for DomainGoal<I>
sourcefn super_visit_with<B>(
&self,
visitor: &mut dyn TypeVisitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
fn super_visit_with<B>(
&self,
visitor: &mut dyn TypeVisitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
Recursively visits the type contents.
sourceimpl<I: Interner> TypeVisitable<I> for DomainGoal<I>
impl<I: Interner> TypeVisitable<I> for DomainGoal<I>
sourcefn visit_with<B>(
&self,
visitor: &mut dyn TypeVisitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
fn visit_with<B>(
&self,
visitor: &mut dyn TypeVisitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
Apply the given visitor visitor
to self
; binders
is the
number of binders that are in scope when beginning the
visitor. Typically binders
starts as 0, but is adjusted when
we encounter Binders<T>
in the IR or other similar
constructs. Read more
sourceimpl<I: Interner> Zip<I> for DomainGoal<I>
impl<I: Interner> Zip<I> for DomainGoal<I>
impl<I: Interner> Copy for DomainGoal<I> where
I::InternedSubstitution: Copy,
I::InternedLifetime: Copy,
I::InternedType: Copy,
impl<I: Eq + Interner> Eq for DomainGoal<I>
impl<I: Interner> StructuralEq for DomainGoal<I>
impl<I: Interner> StructuralPartialEq for DomainGoal<I>
Auto Trait Implementations
impl<I> RefUnwindSafe for DomainGoal<I> where
<I as Interner>::DefId: RefUnwindSafe,
<I as Interner>::InternedLifetime: RefUnwindSafe,
<I as Interner>::InternedSubstitution: RefUnwindSafe,
<I as Interner>::InternedType: RefUnwindSafe,
impl<I> Send for DomainGoal<I> where
<I as Interner>::DefId: Send,
<I as Interner>::InternedLifetime: Send,
<I as Interner>::InternedSubstitution: Send,
<I as Interner>::InternedType: Send,
impl<I> Sync for DomainGoal<I> where
<I as Interner>::DefId: Sync,
<I as Interner>::InternedLifetime: Sync,
<I as Interner>::InternedSubstitution: Sync,
<I as Interner>::InternedType: Sync,
impl<I> Unpin for DomainGoal<I> where
<I as Interner>::DefId: Unpin,
<I as Interner>::InternedLifetime: Unpin,
<I as Interner>::InternedSubstitution: Unpin,
<I as Interner>::InternedType: Unpin,
impl<I> UnwindSafe for DomainGoal<I> where
<I as Interner>::DefId: UnwindSafe,
<I as Interner>::InternedLifetime: UnwindSafe,
<I as Interner>::InternedSubstitution: UnwindSafe,
<I as Interner>::InternedType: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Cast for T
impl<T> Cast for T
sourcefn cast<U>(self, interner: U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
fn cast<U>(self, interner: U::Interner) -> U where
Self: CastTo<U>,
U: HasInterner,
Cast a value to type U
using CastTo
.
sourceimpl<T, I> CastTo<DomainGoal<I>> for T where
T: CastTo<WhereClause<I>>,
I: Interner,
impl<T, I> CastTo<DomainGoal<I>> for T where
T: CastTo<WhereClause<I>>,
I: Interner,
sourcefn cast_to(self, interner: I) -> DomainGoal<I>
fn cast_to(self, interner: I) -> DomainGoal<I>
Cast a value to type T
.
sourceimpl<T, I> CastTo<ProgramClause<I>> for T where
T: CastTo<DomainGoal<I>>,
I: Interner,
impl<T, I> CastTo<ProgramClause<I>> for T where
T: CastTo<DomainGoal<I>>,
I: Interner,
sourcefn cast_to(self, interner: I) -> ProgramClause<I>
fn cast_to(self, interner: I) -> ProgramClause<I>
Cast a value to type T
.
sourceimpl<T, I> CouldMatch<T> for T where
T: Zip<I> + HasInterner<Interner = I> + ?Sized,
I: Interner,
impl<T, I> CouldMatch<T> for T where
T: Zip<I> + HasInterner<Interner = I> + ?Sized,
I: Interner,
sourcefn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &T
) -> bool
fn could_match(
&self,
interner: I,
db: &dyn UnificationDatabase<I>,
other: &T
) -> bool
Checks whether self
and other
could possibly match.
sourceimpl<T, I> Shift<I> for T where
T: TypeFoldable<I>,
I: Interner,
impl<T, I> Shift<I> for T where
T: TypeFoldable<I>,
I: Interner,
sourcefn shifted_in(self, interner: I) -> T
fn shifted_in(self, interner: I) -> T
Shifts this term in one level of binders.
sourcefn shifted_in_from(self, interner: I, source_binder: DebruijnIndex) -> T
fn shifted_in_from(self, interner: I, source_binder: DebruijnIndex) -> T
Shifts a term valid at outer_binder
so that it is
valid at the innermost binder. See DebruijnIndex::shifted_in_from
for a detailed explanation. Read more
sourcefn shifted_out_to(
self,
interner: I,
target_binder: DebruijnIndex
) -> Result<T, NoSolution>
fn shifted_out_to(
self,
interner: I,
target_binder: DebruijnIndex
) -> Result<T, NoSolution>
Shifts a term valid at the innermost binder so that it is
valid at outer_binder
. See DebruijnIndex::shifted_out_to
for a detailed explanation. Read more
sourcefn shifted_out(self, interner: I) -> Result<T, NoSolution>
fn shifted_out(self, interner: I) -> Result<T, NoSolution>
Shifts this term out one level of binders.
sourceimpl<T, I> VisitExt<I> for T where
I: Interner,
T: TypeVisitable<I>,
impl<T, I> VisitExt<I> for T where
I: Interner,
T: TypeVisitable<I>,
sourcefn has_free_vars(&self, interner: I) -> bool
fn has_free_vars(&self, interner: I) -> bool
Check whether there are free (non-bound) variables.