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.stale_declaration

Listed failure can never happen.

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

example
type Note = Text {}type Refused = Failure {    kind: FailureKind.rejected}action complete(note: Note) fails Refused -> Note {    return note}
text
error: `Refused` can never leave `complete` --> main.jadpo:7:35  |7 | action complete(note: Note) fails Refused -> Note {  |                                   ^^^^^^^ never raised or passed on  reason: Nothing in `complete` rejects `Refused` or passes it on from a call, and `fails` lists exactly the failures that can leave, so callers aren't made to handle one that never happens.  next: Remove `Refused` from `fails` (agent)  rule: failure.stale_declaration  help: https://jadpo.dev/docs/errors/failure.stale_declarationcheck failed: 1 error, 1 file

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