Enum BuildError 

pub enum BuildError {
    DuplicateTaskId(String),
    TaskNotFound(String),
    EmptyBranch,
    EmptyFork,
    MissingBranches {
        branch_id: String,
        missing_keys: Vec<String>,
    },
    OrphanBranches {
        branch_id: String,
        orphan_keys: Vec<String>,
    },
    InvalidMaxIterations(String),
    EmptyWorkflow,
    InvalidDuration(String),
    DefinitionMismatch {
        expected: DefinitionHash,
        found: DefinitionHash,
    },
    MissingDep {
        task_id: &'static str,
        type_name: &'static str,
    },
    RegistryDepsConflict {
        task_id: &'static str,
    },
}

Errors produced during workflow construction (builder / hydration).

Variants

DuplicateTaskId(String)

A duplicate task ID was found during workflow building.

TaskNotFound(String)

A referenced task ID was not found in the registry.

EmptyBranch

A branch closure produced an empty sub-builder (no steps added).

EmptyFork

A fork has no branches.

MissingBranches

One or more declared branch keys have no corresponding .branch() call and no default branch was provided.

Fields

branch_id: String

The route node ID.

missing_keys: Vec<String>

Keys declared in BranchKey::all_keys() with no matching branch.

OrphanBranches

One or more .branch() calls use keys not declared in the BranchKey enum.

Fields

branch_id: String

The route node ID.

orphan_keys: Vec<String>

Keys passed to .branch() that are not in BranchKey::all_keys().

InvalidMaxIterations(String)

A loop’s max_iterations was set to zero.

EmptyWorkflow

The workflow has no tasks.

InvalidDuration(String)

A duration value is not finite or is negative.

DefinitionMismatch

The workflow definition hash doesn’t match during hydration.

Fields

expected: DefinitionHash

The expected hash (from current workflow).

found: DefinitionHash

The hash found in the serialized state.

MissingDep

A #[task] requires a dependency that is missing from the Deps container passed to workflow! { deps: … }.

Emitted by verify_deps codegen at workflow construction time, so the failure surfaces as a BuildErrors rather than panicking at first task invocation.

Fields

task_id: &'static str

The task that requires the dependency.

type_name: &'static str

The Rust type name of the missing dependency (via std::any::type_name).

RegistryDepsConflict

A task auto-registered via workflow! { deps: … } is already present in the pre-built TaskRegistry passed via workflow! { registry: … }.

Without this check the duplicate registration would be silently deduped, and the resulting task instance would depend on registration order rather than the user’s expressed intent. Surfacing the conflict forces an explicit choice between the two sources.

Fields

task_id: &'static str

The task whose registration source is ambiguous.

Trait Implementations

impl Clone for BuildError

fn clone(&self) -> BuildError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BuildError

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

Formats the value using the given formatter.

impl Display for BuildError

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

Formats the value using the given formatter.

impl Error for BuildError

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 From<BuildError> for BuildErrors

fn from(error: BuildError) -> Self

Converts to this type from the input type.