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ProphecyGhost

vstd::proph

Struct ProphecyGhost 

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pub struct ProphecyGhost<T> { /* private fields */ }
Expand description

A general-purpose prophecy variable.

A prophecy variable is allocated via ProphecyGhost::new and resolved to a definitive value via ProphecyGhost::resolve.

In contrast to the similar Prophecy, this allows resolving on ghost computations and permits dependent resolutions. However, the value() is marked verifier::prophetic, which entails certain restrictions in the way it can be used. See the module level documentation for a detailed comparison with the rationale for these trade-offs.

See ProphecySeq for an example of a library verified using dependent resolutions.

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impl<T> ProphecyGhost<T>

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pub uninterp spec fn value(&self) -> T

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pub proof fn new() -> tracked proph_var : Self

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pub proof fn resolve(tracked self, value: T)

ensures
self.value() == value,
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pub proof fn resolve_dependent<U>(tracked self, tracked u: &ProphecyGhost<U>, f: FnSpec<(U,), T>)

ensures
self.value() == f(u.value()),
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pub proof fn resolve_dependent_2<U, V>(tracked self, tracked u: &ProphecyGhost<U>, tracked v: &ProphecyGhost<V>, f: FnSpec<(U, V), T>, )

ensures
self.value() == f(u.value(), v.value()),
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pub proof fn resolve_dependent_3<U, V, W>(tracked self, tracked u: &ProphecyGhost<U>, tracked v: &ProphecyGhost<V>, tracked w: &ProphecyGhost<W>, f: FnSpec<(U, V, W), T>, )

ensures
self.value() == f(u.value(), v.value(), w.value()),

Auto Trait Implementations§

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impl<T> Freeze for ProphecyGhost<T>

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impl<T> RefUnwindSafe for ProphecyGhost<T>
where T: RefUnwindSafe,

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impl<T> Send for ProphecyGhost<T>

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impl<T> Sync for ProphecyGhost<T>

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impl<T> Unpin for ProphecyGhost<T>
where T: Unpin,

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impl<T> UnsafeUnpin for ProphecyGhost<T>

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impl<T> UnwindSafe for ProphecyGhost<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, VERUS_SPEC__A> FromSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: From<T>,

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exec fn obeys_from_spec() -> bool

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exec fn from_spec(v: T) -> VERUS_SPEC__A

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, VERUS_SPEC__A> IntoSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: Into<T>,

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exec fn obeys_into_spec() -> bool

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exec fn into_spec(self) -> T

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impl<T, U> IntoSpecImpl<U> for T
where U: From<T>,

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open spec fn obeys_into_spec() -> bool

{ <U as FromSpec<Self>>::obeys_from_spec() }
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open spec fn into_spec(self) -> U

{ U::from_spec(self) }
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, VERUS_SPEC__A> TryFromSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: TryFrom<T>,

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exec fn obeys_try_from_spec() -> bool

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exec fn try_from_spec( v: T, ) -> Result<VERUS_SPEC__A, <VERUS_SPEC__A as TryFrom<T>>::Error>

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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T, VERUS_SPEC__A> TryIntoSpec<T> for VERUS_SPEC__A
where VERUS_SPEC__A: TryInto<T>,

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exec fn obeys_try_into_spec() -> bool

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exec fn try_into_spec(self) -> Result<T, <VERUS_SPEC__A as TryInto<T>>::Error>

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impl<T, U> TryIntoSpecImpl<U> for T
where U: TryFrom<T>,

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open spec fn obeys_try_into_spec() -> bool

{ <U as TryFromSpec<Self>>::obeys_try_from_spec() }
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open spec fn try_into_spec(self) -> Result<U, <U as TryFrom<T>>::Error>

{ <U as TryFromSpec<Self>>::try_from_spec(self) }
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impl<A> SpecEq<&A> for A
where A: ?Sized,

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impl<A> SpecEq<&mut A> for A
where A: ?Sized,

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impl<A> SpecEq<A> for A
where A: ?Sized,

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impl<A> SpecEq<Ghost<A>> for A

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impl<A> SpecEq<Tracked<A>> for A