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

Trait Implementations§

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==.
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
Compare self to key and return true if they are equal.

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Should always be Self
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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