Enum PlanError 

#[non_exhaustive]
pub enum PlanError {
    Empty,
    DuplicateStep(StepId),
    MissingDependency {
        step: StepId,
        missing: StepId,
    },
    Cycle(StepId),
    NoTerminal,
    Unreachable {
        step: StepId,
    },
    NoProvider {
        step: StepId,
        capability: String,
    },
    ArgumentNotUpstream {
        step: StepId,
        arg: String,
        from_step: StepId,
    },
    NoArguments {
        step: StepId,
    },
    VerifierWithoutSubject {
        step: StepId,
    },
    VerifierRequired,
    FalseParallelism {
        a: StepId,
        b: StepId,
    },
    NoAuthorityToSeparate {
        capability: String,
    },
    TooManySteps {
        steps: usize,
        allowed: usize,
    },
}

A plan that must not run, and why.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Empty

DuplicateStep(StepId)

MissingDependency

Fields

step: StepId

missing: StepId

Cycle(StepId)

NoTerminal

Without a terminal node nothing ever declares the plan finished, and the run would either loop or stop for no stated reason.

Unreachable

Fields

step: StepId

NoProvider

Fields

step: StepId

capability: String

ArgumentNotUpstream

Fields

step: StepId

arg: String

from_step: StepId

NoArguments

Fields

step: StepId

VerifierWithoutSubject

A verifier that could not have seen the work it claims to check.

Fields

step: StepId

VerifierRequired

FalseParallelism

Fields

a: StepId

b: StepId

NoAuthorityToSeparate

Fields

capability: String

TooManySteps

Fields

steps: usize

allowed: usize

Trait Implementations

impl Clone for PlanError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PlanError

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

Formats the value using the given formatter.

impl Display for PlanError

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

Formats the value using the given formatter.

impl Eq for PlanError

impl Error for PlanError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for PlanError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PlanError