Enum VennError 

pub enum VennError {
    UnmappedKernel {
        recipe: String,
        node: String,
        op: String,
        kernels: String,
    },
    MissingValue {
        family: String,
        param: String,
        node: String,
    },
    UnknownMeasurement {
        family: String,
        key: String,
    },
    Cost(CostError),
    Run(String),
    Load(String),
    Drift(Vec<String>),
    Checkpoint(String),
}

2026-09-29: Why a Venn table could not be built.

Variants

UnmappedKernel

2026-09-29: A compared node whose plan group’s kernels no family lists.

Fields

recipe: String

2026-09-29: Recipe.

node: String

2026-09-29: Node id.

op: String

2026-09-29: Op name.

kernels: String

2026-09-29: Kernels.

MissingValue

2026-09-29: A parameter a node cannot supply, and no stated absent value.

Fields

family: String

2026-09-29: Family id.

param: String

2026-09-29: Parameter.

node: String

2026-09-29: Node id.

UnknownMeasurement

2026-09-29: An evidence record naming a measurements.toml row that does not exist.

Fields

family: String

2026-09-29: Family id.

key: String

2026-09-29: The key.

Cost(CostError)

2026-09-29: A node the roofline cannot estimate.

Run(String)

2026-09-29: A mode the target circuit has no section for, or a row count it cannot run.

Load(String)

2026-09-29: Loading or fusing a subject.

Drift(Vec<String>)

2026-09-29: The family manifest disagrees with the kernel sources.

Checkpoint(String)

2026-09-29: The target instance disagrees with the checkpoint directory it was named by.

Trait Implementations

impl Clone for VennError

fn clone(&self) -> VennError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VennError

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

Formats the value using the given formatter.

impl Display for VennError

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

Formats the value using the given formatter.

impl Error for VennError

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<CostError> for VennError

fn from(source: CostError) -> Self

Converts to this type from the input type.

impl PartialEq for VennError

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for VennError

impl StructuralPartialEq for VennError