Enum Error 

pub enum Error {
    UndefinedDerivative,
    EmptyComplementaryClass,
    AmbiguousCharSet,
    BadClassId,
    NonDisjointCharSets,
    MissingDefaultSuccessor,
}

Error codes produced by operations on partitions and regular expressions

Variants

UndefinedDerivative

The derivative of R with respect to a character set C is not defined.

This means that C is not included in a derivative class of R (i.e., it overlaps several classes).

EmptyComplementaryClass

The complementary class of a regular expression R is empty

The deriv classes of R consists of a set of disjoint character intervals C₀, … C_n-1 and an implicit complementary class equal to complement (Union(C₀, …, C_n-1)). It’s an error to try to compute the derivative of R with respect to the complementary class if it is empty.

AmbiguousCharSet

The class id of a CharSet s in a CharPartition p is not defined.

This means that s overlaps a class of p but is not contained in that class.

BadClassId

Bad class id for a CharPartition.

A bad class id is either of the form ClassId::Interval(i) where i is out of bound, or ClassId::Complement where the complementary class is empty.

NonDisjointCharSets

Error reported where a list of disjoint char sets is expected.

MissingDefaultSuccessor

No default successor specified for an automaton state when one is required.

Trait Implementations

impl Clone for Error

fn clone(&self) -> Error

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Error

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Eq for Error

impl Error for Error

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 PartialEq for Error

fn eq(&self, other: &Error) -> 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 StructuralPartialEq for Error