Enum FallbackMode 

pub enum FallbackMode {
    UnknownBackend,
    SourceCompilationFailed,
    BackendLacksStream,
}

Closed catalog of “why streaming did not activate” tags. Each tag corresponds to a specific decision point in server_execute_streaming. Adding a variant requires updating the catalog pin tests.

Variants

UnknownBackend

resolve_streaming_backend returned None for the requested backend name (after auto resolution). The dispatcher’s BackendError surfaces as axon.error.

SourceCompilationFailed

Source could not be parsed (lex / parse / type-check / IR- generation error). The dispatcher’s compilation-error path surfaces the diagnostic via axon.error.

BackendLacksStream

Reserved for future scenarios where a custom adopter- provided backend implements Backend::complete() but not Backend::stream(). Not reachable today (all 8 dispatched backends implement stream() per Fase 24 + 33.x.b); kept here so the catalog covers the conceptual case adopters hit when extending the registry.

Implementations

impl FallbackMode

pub fn slug(&self) -> &'static str

Stable kebab-case slug for wire serialization. Mirrors serde(rename_all = "snake_case") but exposed programmatically for adopters that don’t go through serde.

Trait Implementations

impl Clone for FallbackMode

fn clone(&self) -> FallbackMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FallbackMode

impl Debug for FallbackMode

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FallbackMode

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for FallbackMode

impl Hash for FallbackMode

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 FallbackMode

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

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for FallbackMode