Enum ConstraintError 

pub enum ConstraintError {
    NoTokenAllowed,
    EmptyConstraint,
}

What went wrong when a constraint could not be satisfied.

Kept as a small crate-local enum (hand-rolled Display/Error, no thiserror dependency — one two-variant enum does not earn a proc-macro crate, per the workspace’s “avoid unnecessary dependencies” rule) rather than folded into kopitiam_core::Error, because “the constraint left no valid token” is a decoding-policy fact, not a tensor/model fact, and this crate is the only place it can arise.

Variants

NoTokenAllowed

After masking, no in-range token survived: the constraint forbade every token the logits row actually has. This is an honest, catchable error, never a panic — a caller can surface it, widen the constraint, or stop. It usually means a bug in the constraint (it should always leave some escape hatch, e.g. an EOS/whitespace token) rather than a bug in the model.

EmptyConstraint

A constraint was constructed with an empty allowed set — rejected at construction so a vacuous constraint can never silently mask an entire vocab at decode time.

Trait Implementations

impl Clone for ConstraintError

fn clone(&self) -> ConstraintError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConstraintError

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

Formats the value using the given formatter.

impl Display for ConstraintError

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

Formats the value using the given formatter.

impl Eq for ConstraintError

impl Error for ConstraintError

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<ConstraintError> for ConstrainedGenerateError

fn from(e: ConstraintError) -> Self

Converts to this type from the input type.

impl PartialEq for ConstraintError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ConstraintError