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## FrameState

# Struct FrameState

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    pub struct FrameState {
        protected_tags: SmallVec<[(AllocId, BorTag); 2]>,
    }

Expand description

Per-call-stack-frame data for borrow tracking

## Fields§

§`protected_tags: SmallVec<[(AllocId, BorTag); 2]>`

If this frame is protecting any tags, they are listed here. We use this list to do incremental updates of the global list of protected tags stored in the `stacked_borrows::GlobalState` upon function return, and if we attempt to pop a protected tag, to identify which call is responsible for protecting the tag. See `Stack::item_invalidated` for more explanation. Tree Borrows also needs to know which allocation these tags belong to so that it can perform a read through them immediately before the frame gets popped.

This will contain one tag per reference passed to the function, so a size of 2 is enough for the vast majority of functions.

## Trait Implementations§

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### impl Debug for FrameState

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl VisitProvenance for FrameState

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#### fn visit_provenance(&self, visit: &mut VisitWith<'_>)

## Auto Trait Implementations§

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### impl Freeze for FrameState

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### impl RefUnwindSafe for FrameState

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### impl Send for FrameState

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### impl Sync for FrameState

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### impl Unpin for FrameState

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### impl UnsafeUnpin for FrameState

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### impl UnwindSafe for FrameState

## 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, 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> Same for T

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#### type Output = T

Should always be `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, 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<V, T> VZip<V> for T
where V: MultiLane<T>,

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#### fn vzip(self) -> V

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes