Enum syntax::feature_gate::UnstableFeatures

pub enum UnstableFeatures {
    Disallow,
    Allow,
    Cheat,
}

Variants

Disallow

Hard errors for unstable features are active, as on beta/stable channels.

Allow

Allow features to be activated, as on nightly.

Cheat

Errors are bypassed for bootstrapping. This is required any time during the build that feature-related lints are set to warn or above because the build turns on warnings-as-errors and uses lots of unstable features. As a result, this is always required for building Rust itself.

Methods

impl UnstableFeatures

pub fn from_environment() -> UnstableFeatures

pub fn is_nightly_build(&self) -> bool

Trait Implementations

impl Copy for UnstableFeatures

impl Clone for UnstableFeatures

fn clone(&self) -> UnstableFeatures

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Hash for UnstableFeatures

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].