Enum MatchError 

pub enum MatchError {
    NoMatch,
    InconsistentBinding,
}

Errors that can occur during matching.

Example

use ocas_atom::AtomArena;
use ocas_atom::Symbol;
use ocas_core::arena::Arena;
use ocas_rewrite::matcher::{match_pattern, MatchError};
use ocas_rewrite::pattern::{Pattern, WildcardLevel};

let arena = Arena::new();
let ctx = AtomArena::new(&arena);
let x = ctx.var("x");
let y = ctx.var("y");
let pat = Pattern::Literal(x);
let err = match_pattern(pat, y).unwrap_err();
assert!(matches!(err, MatchError::NoMatch));

Variants

NoMatch

The pattern did not match the atom.

InconsistentBinding

A wildcard name was bound to two different values.

Trait Implementations

impl Clone for MatchError

fn clone(&self) -> MatchError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MatchError

impl Debug for MatchError

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

Formats the value using the given formatter.

impl Display for MatchError

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

Formats the value using the given formatter.

impl Eq for MatchError

impl Error for MatchError

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 MatchError

fn eq(&self, other: &MatchError) -> 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 MatchError