Enum rustc_attr::builtin::StabilityLevel

pub enum StabilityLevel {
    Unstable {
        reason: UnstableReason,
        issue: Option<NonZeroU32>,
        is_soft: bool,
        implied_by: Option<Symbol>,
    },
    Stable {
        since: Symbol,
        allowed_through_unstable_modules: bool,
    },
}

The available stability levels.

Variants

Unstable

Fields

reason: UnstableReason

Reason for the current stability level.

issue: Option<NonZeroU32>

Relevant rust-lang/rust issue.

is_soft: bool

implied_by: Option<Symbol>

If part of a feature is stabilized and a new feature is added for the remaining parts, then the implied_by attribute is used to indicate which now-stable feature previously contained a item.

#[unstable(feature = "foo", issue = "...")]
fn foo() {}
#[unstable(feature = "foo", issue = "...")]
fn foobar() {}

…becomes…

#[stable(feature = "foo", since = "1.XX.X")]
fn foo() {}
#[unstable(feature = "foobar", issue = "...", implied_by = "foo")]
fn foobar() {}

#[unstable]

Stable

Fields

since: Symbol

Rust release which stabilized this feature.

allowed_through_unstable_modules: bool

Is this item allowed to be referred to on stable, despite being contained in unstable modules?

#[stable]

Implementations

impl StabilityLevel

pub fn is_unstable(&self) -> bool

pub fn is_stable(&self) -> bool

Trait Implementations

impl Clone for StabilityLevel

fn clone(&self) -> StabilityLevel

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for StabilityLevel

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

Formats the value using the given formatter.

impl<__D: Decoder> Decodable<__D> for StabilityLevel

fn decode(__decoder: &mut __D) -> Self

impl<__E: Encoder> Encodable<__E> for StabilityLevel

fn encode(&self, __encoder: &mut __E)

impl Hash for StabilityLevel

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<__CTX> HashStable<__CTX> for StabilityLevelwhere
    __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl PartialEq<StabilityLevel> for StabilityLevel

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

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

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.

impl Copy for StabilityLevel

impl Eq for StabilityLevel

impl StructuralEq for StabilityLevel

impl StructuralPartialEq for StabilityLevel

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: 16 bytes

Size for each variant:

• Unstable: 15 bytes
• Stable: 7 bytes