Enum Stability

pub enum Stability {
    Stable,
    Unstable(Symbol),
    Forbidden {
        reason: &'static str,
    },
}

Stability information for target features.

Variants

Stable

This target feature is stable, it can be used in #[target_feature] and #[cfg(target_feature)].

Unstable(Symbol)

This target feature is unstable; using it in #[target_feature] or #[cfg(target_feature)] requires enabling the given nightly feature.

Forbidden

This feature can not be set via -Ctarget-feature or #[target_feature], it can only be set in the basic target definition. Used in particular for features that change the floating-point ABI.

Fields

reason: &'static str

Implementations

impl Stability

pub fn is_stable(self) -> bool

pub fn is_supported(self) -> bool

Forbidden features are not supported.

Trait Implementations

impl Clone for Stability

fn clone(&self) -> Stability

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Stability

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

Formats the value using the given formatter.

impl<CTX> HashStable<CTX> for Stability

fn hash_stable(&self, hcx: &mut CTX, hasher: &mut StableHasher)

impl Copy for Stability

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: 24 bytes

Size for each variant:

• Stable: 0 bytes
• Unstable: 4 bytes
• Forbidden: 20 bytes