Enum SolveError 

pub enum SolveError {
    Build(BddBuildError),
    Unsatisfiable,
    BadOrder {
        var: VarId,
    },
    BadPlan {
        what: &'static str,
    },
    SatTimeout,
    SatUnsupported {
        what: &'static str,
    },
    SatModelRejected,
    SatSolverFailure {
        what: &'static str,
    },
}

Why a solve failed.

Variants

Build(BddBuildError)

The constraints could not be turned into a BDD or, for an Engine that fell back, into a CNF (including BddBuildError::TooLarge from Solver, the SAT-fallback trigger).

Unsatisfiable

No assignment satisfies the constraints (LRM 18.6.3: randomize() returns 0 and changes nothing).

BadOrder

The caller’s variable order names an unknown or repeated variable.

Fields

var: VarId

The offending entry.

BadPlan

The Plan is malformed in a way other than naming a bad variable.

Fields

what: &'static str

What is wrong.

SatTimeout

The SAT fallback (super::sat) did not finish within its time limit.

SatUnsupported

The plan asks the SAT fallback for something it cannot sample faithfully (a dist weighted by a count of models or of distinct values, a randc variable too wide to enumerate); refused instead of silently mis-weighted.

Fields

what: &'static str

What is not supported.

SatModelRejected

A model the SAT solver returned failed the IR’s own evaluator: a bug in the CNF encoding, never a legal outcome.

SatSolverFailure

The SAT solver itself failed (out of memory, an internal error) or contradicted itself; never a legal outcome.

Fields

what: &'static str

What went wrong.

Trait Implementations

impl Clone for SolveError

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 SolveError

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

Formats the value using the given formatter.

impl Display for SolveError

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

Formats the value using the given formatter.

impl Eq for SolveError

impl Error for SolveError

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<BddBuildError> for SolveError

fn from(e: BddBuildError) -> Self

Converts to this type from the input type.

impl PartialEq for SolveError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SolveError