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() -> &'static [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

Formats the value using the given formatter.

impl Display for PreviewFeature

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

Formats the value using the given formatter.

impl FromStr for PreviewFeature

type Err = ParsePreviewFeatureError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

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

impl Hash for PreviewFeature

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, Self: Sized,

Feeds a slice of this type into the given Hasher.

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 Copy for PreviewFeature

impl Eq for PreviewFeature

impl StructuralPartialEq for PreviewFeature