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
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Reference: Project layout and modules

Project layout and modules · rule

semantic.not_callable

Name cannot be called.

Area 1, Project layout and modules; not declinable; the next step is usually the agent's.

example
type OutOfStock = Failure {    kind: FailureKind.conflict}action reserve_item() fails OutOfStock -> Unit {    reject OutOfStock()}
text
error: `OutOfStock` is a failure and can't be called --> main.jadpo:6:12  |6 |     reject OutOfStock()  |            ^^^^^^^^^^ not callable  reason: A failure is raised with `reject OutOfStock`, with its fields in a block when it has any.  next: Write `OutOfStock` without `()` (agent)  rule: semantic.not_callable  help: https://jadpo.dev/docs/errors/semantic.not_callablecheck failed: 1 error, 1 file

A fixture builds test data, so only tests, other fixtures and seeds call it (area 13); an action can't, even when the fixture is public:

example
use planning/types { TodoCount }use planning/fixtures { two_open_todos }action count_todos() -> TodoCount {    return two_open_todos()}
text
error: An action can't call fixture `two_open_todos` --> domains/planning/actions/count_todos.jadpo:5:12  |5 |     return two_open_todos()  |            ^^^^^^^^^^^^^^ test data  reason: A fixture builds test data: only tests, other fixtures and seeds call it, and it is never compiled into a deployable.  next: Call the actions `two_open_todos` calls, or move this call into a test, fixture or seed (agent)  rule: semantic.not_callable  help: https://jadpo.dev/docs/errors/semantic.not_callablecheck failed: 1 error, 5 files

Markdown for agents: /docs/errors/semantic.not_callable.md.Built from Jadpo main at a707efb.