# Enum cargo::core::resolver::resolve::ResolveVersion

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    pub enum ResolveVersion {
        V1,
        V2,
        V3,
        V4,
    }

Expand description

A version to indicate how a `Cargo.lock` should be serialized.

When creating a new lockfile, the version with `#[default]` is used. If an old version of lockfile already exists, it will stay as-is.

It’s important that if a new version is added that this is not updated until at least the support for the version is in the stable release of Rust.

This resolve version will be used for all new lock files, for example those generated by `cargo update` (update everything) or building after a `cargo new` (where no lock file previously existed). This is also used for updated lock files such as when a dependency is added or when a version requirement changes. In this situation Cargo’s updating the lock file anyway so it takes the opportunity to bump the lock file version forward.

It’s theorized that we can add more here over time to track larger changes to the `Cargo.lock` format, but we’ve yet to see how that strategy pans out.

## Variants§

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### V1

Historical baseline for when this abstraction was added.

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### V2

A more compact format, more amenable to avoiding source-control merge conflicts. The `dependencies` arrays are compressed and checksums are listed inline. Introduced in 2019 in version 1.38. New lockfiles use V2 by default from 1.41 to 1.52.

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### V3

A format that explicitly lists a `version` at the top of the file as well as changing how git dependencies are encoded. Dependencies with `branch = "master"` are no longer encoded the same way as those without branch specifiers. Introduced in 2020 in version 1.47. New lockfiles use V3 by default staring in 1.53.

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### V4

Unstable. Will collect a certain amount of changes and then go.

Changes made:

- SourceId URL serialization is aware of URL encoding.

## Trait Implementations§

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### impl Clone for ResolveVersion

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

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 ResolveVersion

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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 Default for ResolveVersion

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#### fn default() -> ResolveVersion

Returns the “default value” for a type. Read more
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### impl Ord for ResolveVersion

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#### fn cmp(&self, other: &ResolveVersion) -> Ordering

This method returns an `Ordering` between `self` and `other`. Read more
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#### fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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#### fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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#### fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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### impl PartialEq<ResolveVersion> for ResolveVersion

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

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl PartialOrd<ResolveVersion> for ResolveVersion

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#### fn partial_cmp(&self, other: &ResolveVersion) -> Option<Ordering>

This method returns an ordering between `self` and `other` values if one exists. Read more
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#### fn lt(&self, other: &Rhs) -> bool

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more
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#### fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
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#### fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
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#### fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
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### impl Copy for ResolveVersion

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### impl Eq for ResolveVersion

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### impl StructuralEq for ResolveVersion

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### impl StructuralPartialEq for ResolveVersion

## Auto Trait Implementations§

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### impl RefUnwindSafe for ResolveVersion

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### impl Send for ResolveVersion

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### impl Sync for ResolveVersion

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### impl Unpin for ResolveVersion

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### impl UnwindSafe for ResolveVersion

## 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<Q, K> Comparable<K> for Qwhere Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn compare(&self, key: &K) -> Ordering

Compare self to `key` and return their ordering.
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### impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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### impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Compare self to `key` and return `true` if they are equal.
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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> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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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> Same<T> for T

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#### type Output = T

Should always be `Self`
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### impl<T> ToOwned for Twhere T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. 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.
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### impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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

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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

## 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:1 byte

Size for each variant:

- `V1`: 0 bytes
- `V2`: 0 bytes
- `V3`: 0 bytes
- `V4`: 0 bytes