# Enum alloc::collections::TryReserveError
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    pub enum TryReserveError {
        CapacityOverflow,
        AllocError {
            layout: Layout,
            // some fields omitted
        },
    }

🔬 This is a nightly-only experimental API. (`try_reserve` #48043)

new API

Expand description

The error type for `try_reserve` methods.

## Variants

`CapacityOverflow`
🔬 This is a nightly-only experimental API. (`try_reserve` #48043)

new API

Error due to the computed capacity exceeding the collection’s maximum (usually `isize::MAX` bytes).

`AllocError`
🔬 This is a nightly-only experimental API. (`try_reserve` #48043)

new API

The memory allocator returned an error

### Fields of AllocError

`layout: Layout`
🔬 This is a nightly-only experimental API. (`try_reserve` #48043)

new API

The layout of allocation request that failed

## Trait Implementations

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### impl Clone for TryReserveError

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#### fn clone(&self) -> TryReserveError

Returns a copy of the value. Read more

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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more

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### impl Debug for TryReserveError

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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 Display for TryReserveError

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

Formats the value using the given formatter. Read more

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### impl From<LayoutError> for TryReserveError

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#### fn from(_: LayoutError) -> Self

Always evaluates to `TryReserveError::CapacityOverflow`.

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### impl PartialEq<TryReserveError> for TryReserveError

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#### fn eq(&self, other: &TryReserveError) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

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#### fn ne(&self, other: &TryReserveError) -> bool

This method tests for `!=`.

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### impl Eq for TryReserveError

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### impl StructuralEq for TryReserveError

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### impl StructuralPartialEq for TryReserveError

## Auto Trait Implementations

### impl Send for TryReserveError

### impl Sync for TryReserveError

### impl Unpin for TryReserveError

## Blanket Implementations

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

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#### pub 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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#### pub 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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#### pub 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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#### pub fn from(t: T) -> T

Performs the conversion.

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

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#### pub fn into(self) -> U

Performs the conversion.

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### impl<T> ToOwned for T where
T: Clone,

#### type Owned = T

The resulting type after obtaining ownership.

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#### pub fn to_owned(&Self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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#### pub fn clone_into(&Self, &mut T)

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

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

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#### pub 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 T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

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#### pub 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>,

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

The type returned in the event of a conversion error.

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#### pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.