pub enum GoalData<I: Interner> {
Quantified(QuantifierKind, Binders<Goal<I>>),
Implies(ProgramClauses<I>, Goal<I>),
All(Goals<I>),
Not(Goal<I>),
EqGoal(EqGoal<I>),
SubtypeGoal(SubtypeGoal<I>),
DomainGoal(DomainGoal<I>),
CannotProve,
}
Expand description
A general goal; this is the full range of questions you can pose to Chalk.
Variants
Quantified(QuantifierKind, Binders<Goal<I>>)
Introduces a binding at depth 0, shifting other bindings up (deBruijn index).
Implies(ProgramClauses<I>, Goal<I>)
A goal that holds given some clauses (like an if-statement).
All(Goals<I>)
List of goals that all should hold.
Not(Goal<I>)
Negation: the inner goal should not hold.
EqGoal(EqGoal<I>)
Make two things equal; the rules for doing so are well known to the logic
SubtypeGoal(SubtypeGoal<I>)
Make one thing a subtype of another; the rules for doing so are well known to the logic
DomainGoal(DomainGoal<I>)
A “domain goal” indicates some base sort of goal that can be proven via program clauses
CannotProve
Indicates something that cannot be proven to be true or false
definitively. This can occur with overflow but also with
unifications of skolemized variables like forall<X,Y> { X = Y }
. Of course, that statement is false, as there exist types
X, Y where X = Y
is not true. But we treat it as “cannot
prove” so that forall<X,Y> { not { X = Y } }
also winds up
as cannot prove.
Implementations
Trait Implementations
sourceimpl<I: Interner> Fold<I> for GoalData<I>
impl<I: Interner> Fold<I> for GoalData<I>
type Result = GoalData<I>
type Result = GoalData<I>
The type of value that will be produced once folding is done.
Typically this is Self
, unless Self
contains borrowed
values, in which case owned values are produced (for example,
one can fold over a &T
value where T: Fold
, in which case
you get back a T
, not a &T
). Read more
sourcefn fold_with<E>(
self,
folder: &mut dyn Folder<I, Error = E>,
outer_binder: DebruijnIndex
) -> Result<Self::Result, E>
fn fold_with<E>(
self,
folder: &mut dyn Folder<I, Error = E>,
outer_binder: DebruijnIndex
) -> Result<Self::Result, 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> HasInterner for GoalData<I>
impl<I: Interner> HasInterner for GoalData<I>
type Interner = I
type Interner = I
The interner associated with the type.
sourceimpl<I: Interner> Visit<I> for GoalData<I>
impl<I: Interner> Visit<I> for GoalData<I>
sourcefn visit_with<B>(
&self,
visitor: &mut dyn Visitor<I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B>
fn visit_with<B>(
&self,
visitor: &mut dyn Visitor<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
impl<I: Interner> Copy for GoalData<I> where
I::InternedType: Copy,
I::InternedLifetime: Copy,
I::InternedGenericArg: Copy,
I::InternedSubstitution: Copy,
I::InternedGoal: Copy,
I::InternedGoals: Copy,
I::InternedProgramClauses: Copy,
I::InternedVariableKinds: Copy,
impl<I: Eq + Interner> Eq for GoalData<I>
impl<I: Interner> StructuralEq for GoalData<I>
impl<I: Interner> StructuralPartialEq for GoalData<I>
Auto Trait Implementations
impl<I> RefUnwindSafe for GoalData<I> where
<I as Interner>::DefId: RefUnwindSafe,
<I as Interner>::InternedGenericArg: RefUnwindSafe,
<I as Interner>::InternedGoal: RefUnwindSafe,
<I as Interner>::InternedGoals: RefUnwindSafe,
<I as Interner>::InternedLifetime: RefUnwindSafe,
<I as Interner>::InternedProgramClauses: RefUnwindSafe,
<I as Interner>::InternedSubstitution: RefUnwindSafe,
<I as Interner>::InternedType: RefUnwindSafe,
<I as Interner>::InternedVariableKinds: RefUnwindSafe,
impl<I> Send for GoalData<I> where
<I as Interner>::DefId: Send,
<I as Interner>::InternedGenericArg: Send,
<I as Interner>::InternedGoal: Send,
<I as Interner>::InternedGoals: Send,
<I as Interner>::InternedLifetime: Send,
<I as Interner>::InternedProgramClauses: Send,
<I as Interner>::InternedSubstitution: Send,
<I as Interner>::InternedType: Send,
<I as Interner>::InternedVariableKinds: Send,
impl<I> Sync for GoalData<I> where
<I as Interner>::DefId: Sync,
<I as Interner>::InternedGenericArg: Sync,
<I as Interner>::InternedGoal: Sync,
<I as Interner>::InternedGoals: Sync,
<I as Interner>::InternedLifetime: Sync,
<I as Interner>::InternedProgramClauses: Sync,
<I as Interner>::InternedSubstitution: Sync,
<I as Interner>::InternedType: Sync,
<I as Interner>::InternedVariableKinds: Sync,
impl<I> Unpin for GoalData<I> where
<I as Interner>::DefId: Unpin,
<I as Interner>::InternedGenericArg: Unpin,
<I as Interner>::InternedGoal: Unpin,
<I as Interner>::InternedGoals: Unpin,
<I as Interner>::InternedLifetime: Unpin,
<I as Interner>::InternedProgramClauses: Unpin,
<I as Interner>::InternedSubstitution: Unpin,
<I as Interner>::InternedType: Unpin,
<I as Interner>::InternedVariableKinds: Unpin,
impl<I> UnwindSafe for GoalData<I> where
<I as Interner>::DefId: UnwindSafe,
<I as Interner>::InternedGenericArg: UnwindSafe,
<I as Interner>::InternedGoal: UnwindSafe,
<I as Interner>::InternedGoals: UnwindSafe,
<I as Interner>::InternedLifetime: UnwindSafe,
<I as Interner>::InternedProgramClauses: UnwindSafe,
<I as Interner>::InternedSubstitution: UnwindSafe,
<I as Interner>::InternedType: UnwindSafe,
<I as Interner>::InternedVariableKinds: 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> 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: Fold<I>,
I: Interner,
impl<T, I> Shift<I> for T where
T: Fold<I>,
I: Interner,
sourcefn shifted_in(self, interner: I) -> <T as Fold<I>>::Result
fn shifted_in(self, interner: I) -> <T as Fold<I>>::Result
Shifts this term in one level of binders.
sourcefn shifted_in_from(
self,
interner: I,
source_binder: DebruijnIndex
) -> <T as Fold<I>>::Result
fn shifted_in_from(
self,
interner: I,
source_binder: DebruijnIndex
) -> <T as Fold<I>>::Result
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 as Fold<I>>::Result, NoSolution>
fn shifted_out_to(
self,
interner: I,
target_binder: DebruijnIndex
) -> Result<<T as Fold<I>>::Result, 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 as Fold<I>>::Result, NoSolution>
fn shifted_out(self, interner: I) -> Result<<T as Fold<I>>::Result, NoSolution>
Shifts this term out one level of binders.
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more