Enum Never 

pub enum Never {}

An uninhabited type that implements Serialize + DeserializeOwned.

This type has no variants and can never be constructed at runtime, making it semantically identical to std::convert::Infallible. Unlike Infallible, Never satisfies the Serialize + DeserializeOwned bounds required by Axon<In, Out, E, Res>.

When to Use

• As the error type for infallible pipelines: Axon<In, Out, Never, Res>
• Anywhere an uninhabited type is needed with serde compatibility

Guarantees

• Cannot be constructed (no variants)
• Serialization: unreachable (no value exists to serialize)
• Deserialization: always fails with a descriptive error
• Converts freely from std::convert::Infallible

Trait Implementations

impl Clone for Never

fn clone(&self) -> Never

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Never

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Never

fn deserialize<D: Deserializer<'de>>(_deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for Never

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

Formats the value using the given formatter.

impl Error for Never

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<Infallible> for Never

fn from(x: Infallible) -> Self

Converts to this type from the input type.

impl Hash for Never

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Never

fn eq(&self, other: &Never) -> 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 Serialize for Never

fn serialize<S: Serializer>(&self, _serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl Copy for Never

impl Eq for Never

impl StructuralPartialEq for Never