[][src]Enum rustc_data_structures::obligation_forest::NodeState

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

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

impl Clone for NodeState[src]

impl Copy for NodeState[src]

impl Debug for NodeState[src]

impl Eq for NodeState[src]

impl PartialEq<NodeState> for NodeState[src]

impl StructuralEq for NodeState[src]

impl StructuralPartialEq for NodeState[src]

Auto Trait Implementations

impl RefUnwindSafe for NodeState

impl Send for NodeState

impl Sync for NodeState

impl Unpin for NodeState

impl UnwindSafe for NodeState

Blanket Implementations

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

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

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

impl<T> Erased for T[src]

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

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.