Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 5 Nov 2026. What's built · Install 0.3.0

ReferenceErrors

Errors Policy · rule

`policy.effect_duplicate`

Policy gives the same list twice.

Area 9, Policy; not declinable; the next step is usually the agent's.

One list per effect, so "who may read a note?" is one line:

example

type Handle = Text {    max_length: 40}entity User {    id: Uuid    handle: Handle {        unique: true    }}principal {    user: {        subject: User.handle    }}entity Note {    id: Uuid    owner_id: User.id {        on_delete: OnDelete.cascade    }    policy: {        read: [owner_id]        read: [Access.authenticated]    }}

jadpo checkcheck failed: 1 error, 1 file

error read: is given twice

--> main.jadpo:26:9

   |25 |         read: [owner_id]   |         ---- first given here26 |         read: [Access.authenticated]   |         ^^^^ given again

reason: Note's policy gives each list once, so "who may read?" is always one line.
next: Merge the two read: lists into one (agent)
rule: policy.effect_duplicate
help: https://jadpo.dev/docs/errors/policy.effect_duplicate

Markdown for agents: /docs/errors/policy.effect_duplicate.md.Built from Jadpo main at aee2e8f.