Enum cargo::core::features::Edition

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pub enum Edition {
    Edition2015,
    Edition2018,
    Edition2021,
}
Expand description

The edition of the compiler (RFC 2052)

The following sections will guide you how to add and stabilize an edition.

Adding a new edition

  • Add the next edition to the enum.
  • Update every match expression that now fails to compile.
  • Update the FromStr impl.
  • Update CLI_VALUES to include the new edition.
  • Set LATEST_UNSTABLE to Some with the new edition.
  • Add an unstable feature to the features! macro invocation below for the new edition.
  • Gate on that new feature in TomlManifest::to_real_manifest.
  • Update the shell completion files.
  • Update any failing tests (hopefully there are very few).
  • Update unstable.md to add a new section for this new edition (see this example).

Stabilization instructions

  • Set LATEST_UNSTABLE to None.
  • Set LATEST_STABLE to the new version.
  • Update is_stable to true.
  • Set the editionNNNN feature to stable in the features! macro invocation below.
  • Update any tests that are affected.
  • Update the man page for the --edition flag.
  • Update unstable.md to move the edition section to the bottom.
  • Update the documentation:
    • Update any features impacted by the edition.
    • Update manifest.md#the-edition-field.
    • Update the --edition flag (options-new.md).
    • Rebuild man pages.

Variants§

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Edition2015

The 2015 edition

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Edition2018

The 2018 edition

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Edition2021

The 2021 edition

Implementations§

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impl Edition

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pub const LATEST_UNSTABLE: Option<Edition> = None

The latest edition that is unstable.

This is None if there is no next unstable edition.

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pub const LATEST_STABLE: Edition = Edition::Edition2021

The latest stable edition.

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pub const CLI_VALUES: [&'static str; 3] = _

Possible values allowed for the --edition CLI flag.

This requires a static value due to the way clap works, otherwise I would have built this dynamically.

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pub(crate) fn first_version(&self) -> Option<Version>

Returns the first version that a particular edition was released on stable.

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pub fn is_stable(&self) -> bool

Returns true if this edition is stable in this release.

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pub fn previous(&self) -> Option<Edition>

Returns the previous edition from this edition.

Returns None for 2015.

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pub fn saturating_next(&self) -> Edition

Returns the next edition from this edition, returning the last edition if this is already the last one.

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pub(crate) fn cmd_edition_arg(&self, cmd: &mut ProcessBuilder)

Updates the given ProcessBuilder to include the appropriate flags for setting the edition.

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pub(crate) fn supports_compat_lint(&self) -> bool

Whether or not this edition supports the rust_*_compatibility lint.

Ideally this would not be necessary, but editions may not have any lints, and thus rustc doesn’t recognize it. Perhaps rustc could create an empty group instead?

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pub(crate) fn supports_idiom_lint(&self) -> bool

Whether or not this edition supports the rust_*_idioms lint.

Ideally this would not be necessary…

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pub(crate) fn default_resolve_behavior(&self) -> ResolveBehavior

Trait Implementations§

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impl Clone for Edition

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fn clone(&self) -> Edition

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
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impl Debug for Edition

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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<'de> Deserialize<'de> for Edition

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Display for Edition

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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 FromStr for Edition

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type Err = Error

The associated error which can be returned from parsing.
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fn from_str(s: &str) -> Result<Self, Error>

Parses a string s to return a value of this type. Read more
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impl Hash for Edition

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
1.3.0 · source§

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Edition

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

This method returns an Ordering between self and other. Read more
1.21.0 · source§

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<Edition> for Edition

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fn eq(&self, other: &Edition) -> 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<Edition> for Edition

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fn partial_cmp(&self, other: &Edition) -> 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 Serialize for Edition

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for Edition

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impl Eq for Edition

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impl StructuralEq for Edition

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impl StructuralPartialEq for Edition

Auto Trait 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> Serialize for Twhere T: Serialize + ?Sized,

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fn erased_serialize(&self, serializer: &mut dyn Serializer) -> Result<Ok, Error>

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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> 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.
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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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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> DeserializeOwned for Twhere T: for<'de> Deserialize<'de>,

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:

  • Edition2015: 0 bytes
  • Edition2018: 0 bytes
  • Edition2021: 0 bytes