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## OccupiedError

# Struct OccupiedError

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    #[non_exhaustive]pub struct OccupiedError<'a, K: 'a, V: 'a, A: Allocator + Clone = Global> {
        pub entry: OccupiedEntry<'a, K, V, A>,
        pub key: K,
        pub value: V,
    }

🔬This is a nightly-only experimental API. (`map_try_insert` #82766)
Expand description

The error returned by `try_insert` when the key already exists.

Contains the occupied entry, key, and the value that was not inserted.

## Fields (Non-exhaustive)§

This struct is marked as non-exhaustive
Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional `Struct { .. }` syntax; cannot be matched against without a wildcard `..`; and struct update syntax will not work.
§`entry: OccupiedEntry<'a, K, V, A>`
🔬This is a nightly-only experimental API. (`map_try_insert` #82766)

The entry in the map that was already occupied.

§`key: K`
🔬This is a nightly-only experimental API. (`map_try_insert` #82766)

The key which was not inserted, because the entry was already occupied.

§`value: V`
🔬This is a nightly-only experimental API. (`map_try_insert` #82766)

The value which was not inserted, because the entry was already occupied.

## Trait Implementations§

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### impl<K: Debug + Ord, V: Debug, A: Allocator + Clone> Debug for OccupiedError<'_, K, V, A>

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl<'a, K, V, A = Global> !UnwindSafe for OccupiedError<'a, K, V, A>

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### impl<'a, K, V, A> Freeze for OccupiedError<'a, K, V, A>
where K: Freeze, V: Freeze, A: Freeze,

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### impl<'a, K, V, A> RefUnwindSafe for OccupiedError<'a, K, V, A>
where K: RefUnwindSafe, V: RefUnwindSafe, A: RefUnwindSafe,

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### impl<'a, K, V, A> Send for OccupiedError<'a, K, V, A>
where K: Send, V: Send, A: Send,

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### impl<'a, K, V, A> Sync for OccupiedError<'a, K, V, A>
where K: Sync, V: Sync, A: Sync,

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### impl<'a, K, V, A> Unpin for OccupiedError<'a, K, V, A>
where K: Unpin, V: Unpin, A: Unpin,

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### impl<'a, K, V, A> UnsafeUnpin for OccupiedError<'a, K, V, A>
where K: UnsafeUnpin, V: UnsafeUnpin, A: UnsafeUnpin,

## 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, 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.