Enum ResolveVersion 

pub enum ResolveVersion {
    V1,
    V2,
}

A version to indicate how a Cargo.lock should be serialized. Currently V2 is the default when creating a new lockfile. If a V1 lockfile already exists, it will stay as V1.

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

V1

Historical baseline for when this abstraction was added.

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 starting in 1.41.

Implementations

impl ResolveVersion

pub fn default_for_new_lockfiles() -> ResolveVersion

The default way to encode new Cargo.lock files.

It’s important that if a new version of ResolveVersion is added that this is not updated until at least the support for the version is in the stable release of Rust. It’s ok for this to be newer than default_for_old_lockfiles below.

pub fn default_for_old_lockfiles() -> ResolveVersion

The default way to encode old preexisting Cargo.lock files. This is often trailing the new lockfiles one above to give older projects a longer time to catch up.

It’s important that this trails behind default_for_new_lockfiles for quite some time. This gives projects a quite large window to update in where we don’t force updates, so if projects span many versions of Cargo all those versions of Cargo will have support for a new version of the lock file.

Trait Implementations

impl Clone for ResolveVersion

fn clone(&self) -> ResolveVersion

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ResolveVersion

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

Formats the value using the given formatter.

impl Ord for ResolveVersion

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for ResolveVersion

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for ResolveVersion

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

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for ResolveVersion

impl Eq for ResolveVersion

impl StructuralPartialEq for ResolveVersion