Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 30 Oct 2026. What's built · Install 0.1.0
jadpo
Reference: Failures

Failures · rule

failure.undeclared_propagation

Failure that can leave is not listed after fails.

Area 4, Failures; not declinable; the next step is usually the agent's.

example
type Note = Text {}type RegistrationClosed = Failure {    kind: FailureKind.conflict}action register(note: Note) -> Note {    reject RegistrationClosed}
text
error: `RegistrationClosed` can leave `register`, but its `fails` list doesn't say so --> main.jadpo:8:5  |8 |     reject RegistrationClosed  |     ^^^^^^^^^^^^^^^^^^^^^^^^^ rejected here  reason: `fails` lists exactly the failures that can leave an action, so every caller knows what it must handle.  next: Add `RegistrationClosed` to `register`'s `fails` list (agent)  rule: failure.undeclared_propagation  help: https://jadpo.dev/docs/errors/failure.undeclared_propagationcheck failed: 1 error, 1 file

Markdown for agents: /docs/errors/failure.undeclared_propagation.md.Built from Jadpo main at a707efb.