Enum PathKind

pub enum PathKind {
    Inductive,
    Unknown,
    Coinductive,
}

In the initial iteration of a cycle, we do not yet have a provisional result. In the case we return an initial provisional result depending on the kind of cycle.

Variants

Inductive

A path consisting of only inductive/unproductive steps. Their initial provisional result is Err(NoSolution). We currently treat them as PathKind::Unknown during coherence until we’re fully confident in our approach.

Unknown

A path which is not be coinductive right now but we may want to change of them to be so in the future. We return an ambiguous result in this case to prevent people from relying on this.

Coinductive

A path with at least one coinductive step. Such cycles hold.

Implementations

impl PathKind

fn extend(self, rest: PathKind) -> PathKind

Returns the path kind when merging self with rest.

Given an inductive path self and a coinductive path rest, the path self -> rest would be coinductive.

This operation represents an ordering and would be equivalent to max(self, rest).

Trait Implementations

impl Clone for PathKind

fn clone(&self) -> PathKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PathKind

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

Formats the value using the given formatter.

impl<__D: Decoder> Decodable<__D> for PathKind

fn decode(__decoder: &mut __D) -> Self

impl<__E: Encoder> Encodable<__E> for PathKind

fn encode(&self, __encoder: &mut __E)

impl From<PathKind> for AllPathsToHeadCoinductive

fn from(path: PathKind) -> AllPathsToHeadCoinductive

Converts to this type from the input type.

impl From<PathKind> for PathsToNested

fn from(path: PathKind) -> PathsToNested

Converts to this type from the input type.

impl From<PathKind> for UsageKind

fn from(path: PathKind) -> UsageKind

Converts to this type from the input type.

impl Hash for PathKind

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<__CTX> HashStable<__CTX> for PathKind

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl PartialEq for PathKind

fn eq(&self, other: &PathKind) -> 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 PathKind

impl Eq for PathKind

impl StructuralPartialEq for PathKind

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• Inductive: 0 bytes
• Unknown: 0 bytes
• Coinductive: 0 bytes