Enum ScheduleBuildError 

#[non_exhaustive]
pub enum ScheduleBuildError {
    HierarchyLoop(String),
    HierarchyCycle(String),
    HierarchyRedundancy(String),
    DependencyLoop(String),
    DependencyCycle(String),
    CrossDependency(String, String),
    SetsHaveOrderButIntersect(String, String),
    SystemTypeSetAmbiguity(String),
    Ambiguity(String),
    Uninitialized,
}

Category of errors encountered during schedule construction.

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.

HierarchyLoop(String)

A system set contains itself.

HierarchyCycle(String)

The hierarchy of system sets contains a cycle.

HierarchyRedundancy(String)

The hierarchy of system sets contains redundant edges.

This error is disabled by default, but can be opted-in using ScheduleBuildSettings.

DependencyLoop(String)

A system (set) has been told to run before itself.

DependencyCycle(String)

The dependency graph contains a cycle.

CrossDependency(String, String)

Tried to order a system (set) relative to a system set it belongs to.

SetsHaveOrderButIntersect(String, String)

Tried to order system sets that share systems.

SystemTypeSetAmbiguity(String)

Tried to order a system (set) relative to all instances of some system function.

Ambiguity(String)

Systems with conflicting access have indeterminate run order.

This error is disabled by default, but can be opted-in using ScheduleBuildSettings.

Uninitialized

Tried to run a schedule before all of its systems have been initialized.

Trait Implementations

impl Debug for ScheduleBuildError

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

Formats the value using the given formatter.

impl Display for ScheduleBuildError

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

Formats the value using the given formatter.

impl Error for ScheduleBuildError

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.