Enum PlanFallback 

pub enum PlanFallback {
    AnchorConstraintsPresent,
    LambdaApplyPresent,
    LetBindingPresent,
    UseToolPresent,
    HibernatePresent,
    PixPresent,
    UnsupportedNode {
        kind: &'static str,
    },
}

Closed catalog of reasons the streaming path falls back to the legacy synchronous orchestration. Each variant maps to a specific adopter source shape the 33.x.b scope explicitly defers.

Variants

AnchorConstraintsPresent

Flow uses anchor: <name> constraints. Anchor enforcement fires on FINAL flow output, which is incompatible with per-token streaming until per-chunk anchor checking lands.

LambdaApplyPresent

Flow uses apply: <lambda> (Fase 15 lambda data apply). Lambda apply runs after the step’s LLM response; per-chunk lambda application is a future fase.

LetBindingPresent

Flow uses let X = ... SSA bindings (Fase 17). Binding resolution runs between steps; streaming path doesn’t yet thread the binding context through the per-chunk loop.

UseToolPresent

Flow uses use_tool mid-step (function calling). Mid-stream tool calls are explicit Fase 33-followon-2 scope.

HibernatePresent

Flow contains a Hibernate step (Fase 19 CPS). Hibernation requires the synchronous CPS handler stack.

PixPresent

Flow contains a Drill or Trail step (Fase 19 PIX). PIX trace state is captured on the synchronous path.

UnsupportedNode

Flow contains an IRFlowNode variant that 33.x.b does not yet model (Conditional / ForIn / Par / Probe / Reason / ShieldApply / etc.). 33.x.b ships the canonical step S { ask: "..." [apply: tool] } shape only; subsequent 33.x followups extend coverage per founder-sequenced sub-fases. The legacy synchronous path keeps working for these flows — there is no functional regression.

Fields

kind: &'static str

Stable kind discriminant — e.g. "conditional", "for_in", "reason". Surfaces in audit row + future 33.x.g warning emission.

Implementations

impl PlanFallback

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

Stable slug for diagnostic emission. Used by audit row + future 33.x.g warning surface.

Trait Implementations

impl Clone for PlanFallback

fn clone(&self) -> PlanFallback

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PlanFallback

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

Formats the value using the given formatter.

impl PartialEq for PlanFallback

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