enum NodeState {
    Pending,
    Success,
    Waiting,
    Done,
    Error,
}
Expand description

The state of one node in some tree within the forest. This represents the current state of processing for the obligation (of type O) associated with this node.

The non-Error state transitions are as follows.

(Pre-creation)
 |
 |     register_obligation_at() (called by process_obligations() and
 v                               from outside the crate)
Pending
 |
 |     process_obligations()
 v
Success
 |  ^
 |  |  mark_successes()
 |  v
 |  Waiting
 |
 |     process_cycles()
 v
Done
 |
 |     compress()
 v
(Removed)

The Error state can be introduced in several places, via error_at().

Outside of ObligationForest methods, nodes should be either Pending or Waiting.

Variants§

§

Pending

This obligation has not yet been selected successfully. Cannot have subobligations.

§

Success

This obligation was selected successfully, but may or may not have subobligations.

§

Waiting

This obligation was selected successfully, but it has a pending subobligation.

§

Done

This obligation, along with its subobligations, are complete, and will be removed in the next collection.

§

Error

This obligation was resolved to an error. It will be removed by the next compression step.

Trait Implementations§

source§

impl Clone for NodeState

source§

fn clone(&self) -> NodeState

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from source. Read more
source§

impl Debug for NodeState

source§

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

Formats the value using the given formatter. Read more
source§

impl PartialEq<NodeState> for NodeState

source§

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
source§

impl Copy for NodeState

source§

impl Eq for NodeState

source§

impl StructuralEq for NodeState

source§

impl StructuralPartialEq for NodeState

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Aligned for T

source§

const ALIGN: Alignment = const ALIGN: Alignment = Alignment::of::<Self>();

Alignment of Self.
source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

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

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for Twhere T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
source§

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

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:

  • Pending: 0 bytes
  • Success: 0 bytes
  • Waiting: 0 bytes
  • Done: 0 bytes
  • Error: 0 bytes