Enum rustc_ap_rustc_feature::UnstableFeatures[][src]

pub enum UnstableFeatures {



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


Allow features to be activated, as on nightly.


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.


impl UnstableFeatures[src]

pub fn from_environment(krate: Option<&str>) -> Self[src]

This takes into account RUSTC_BOOTSTRAP.

If krate is Some, then setting RUSTC_BOOTSTRAP=krate will enable the nightly features. Otherwise, only RUSTC_BOOTSTRAP=1 will work.

pub fn is_nightly_build(&self) -> bool[src]

Trait Implementations

impl Clone for UnstableFeatures[src]

impl Copy for UnstableFeatures[src]

impl Debug for UnstableFeatures[src]

impl Hash for UnstableFeatures[src]

Auto Trait Implementations

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<'a, T> Captures<'a> for T where
    T: ?Sized

impl<T> Erased for T[src]

impl<T> From<T> for T[src]

impl<T> Instrument for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 

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type Output = T

Should always be Self

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    T: Clone

type Owned = T

The resulting type after obtaining ownership.

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    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

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type Error = <U as TryFrom<T>>::Error

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    V: MultiLane<T>,