# Struct alloc::collections::btree_map::OccupiedError

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    pub struct OccupiedError<'a, K: 'a, V: 'a, A: Allocator + Clone = Global> {
        pub entry: OccupiedEntry<'a, K, V, A>,
        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, and the value that was not inserted.

## Fields§

§`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.

§`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
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### impl<'a, K: Debug + Ord, V: Debug, A: Allocator + Clone> Display for OccupiedError<'a, K, V, A>

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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<'a, K: Debug + Ord, V: Debug> Error for OccupiedError<'a, K, V>

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#### fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
Read more
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#### fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more
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#### fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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#### fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (`error_generic_member_access` #99301)
Provides type based access to context intended for error reports. Read more

## Auto Trait Implementations§

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

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

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

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

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

## Blanket Implementations§

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### impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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> ToString for Twhere T: Display + ?Sized,

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#### default fn to_string(&self) -> String

Converts the given value to a `String`. Read more
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### impl<T, U> TryFrom<U> for Twhere 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 Twhere 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.