Enum Arrival 

pub enum Arrival {
    Included,
    Pinned(&'static Pinned),
    Wall(Wall),
    Unpublished,
}

How the sysroot for one target reaches the machine that compiles for it.

Four answers, and the reason this is an enum rather than an optional URL is that three of them have no URL and mean entirely different things. A target nobody has published a tree for yet gets one in a later release. A target behind a licence wall does not, ever, and telling the two apart is the whole of spec/cross-compile/13-distribution.md section 13.4.

Variants

Included

Nothing has to arrive. The compiler’s own headers are inside the binary and a freestanding target links none of a library, so the archive is the whole of what this target needs.

Pinned(&'static Pinned)

A sysroot artifact this release pins, by URL and by hash.

Wall(Wall)

Behind one of the two licence walls, so there is nothing to ship and nothing to fetch, and what a person does instead is name a path they already have a licence for.

Unpublished

Ours to ship, and not yet published. A later release pins it.

Implementations

impl Arrival

pub fn of(target: TargetTuple) -> Arrival

How the sysroot for this target arrives.

pub const fn as_str(self) -> &'static str

The word this state is spelled with in the file.

Trait Implementations

impl Clone for Arrival

fn clone(&self) -> Arrival

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Arrival

impl Debug for Arrival

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

Formats the value using the given formatter.

impl Eq for Arrival

impl PartialEq for Arrival

fn eq(&self, other: &Arrival) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Arrival