Enum PreviewFeature 

#[non_exhaustive]
pub enum PreviewFeature {
    TestInfra,
}

A preview feature that can be enabled with --preview.

Preview features are in-progress language additions that:

• May change or be removed before stabilization
• Require explicit opt-in via --preview <feature>
• Allow incremental implementation to be merged to main

See ADR-0005 for the full design.

When all preview features are stabilized, this enum may be empty. New preview features are added here as development begins.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

TestInfra

Testing infrastructure feature - permanently unstable. Used to verify the preview feature gating mechanism works.

Implementations

impl PreviewFeature

pub fn name(&self) -> &'static str

Get the CLI name for this feature (used with --preview).

pub fn adr(&self) -> &'static str

Get the ADR number documenting this feature.

pub fn all() -> Vec<PreviewFeature>

Get all available preview features.

pub fn all_names() -> String

Get a comma-separated list of all feature names (for help text).

Trait Implementations

impl Clone for PreviewFeature

fn clone(&self) -> PreviewFeature

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PreviewFeature

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

Formats the value using the given formatter.

impl Display for PreviewFeature

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

Formats the value using the given formatter.

impl<'_derivative_strum> From<&'_derivative_strum PreviewFeature> for &'static str

fn from(x: &'_derivative_strum PreviewFeature) -> &'static str

Converts to this type from the input type.

impl From<PreviewFeature> for &'static str

fn from(x: PreviewFeature) -> &'static str

Converts to this type from the input type.

impl FromStr for PreviewFeature

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<PreviewFeature, <PreviewFeature as FromStr>::Err>

Parses a string s to return a value of this type.

impl Hash for PreviewFeature

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

where __H: Hasher,

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoEnumIterator for PreviewFeature

type Iterator = PreviewFeatureIter

fn iter() -> PreviewFeatureIter

impl PartialEq for PreviewFeature

fn eq(&self, other: &PreviewFeature) -> 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 TryFrom<&str> for PreviewFeature

type Error = ParseError

The type returned in the event of a conversion error.

fn try_from( s: &str, ) -> Result<PreviewFeature, <PreviewFeature as TryFrom<&str>>::Error>

Performs the conversion.

impl Copy for PreviewFeature

impl Eq for PreviewFeature

impl StructuralPartialEq for PreviewFeature