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
jadpo
ReferenceErrors

ErrorsProject layout and modules · rule

semantic.unknown_callee

Called name is not declared.

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

example
type Count = Int {    min: 0}function f(x: Count) -> Count {    return lookup(x)}
jadpo checkcheck failed: 1 error, 1 file

error lookup isn't a function, action or query

--> main.jadpo:6:12

  |6 |     return lookup(x)  |            ^^^^^^ not declared
reason
Nothing in this project called lookup can be called.
next
Declare lookup, or call an existing function (agent)
rule
semantic.unknown_callee
help
https://jadpo.dev/docs/errors/semantic.unknown_callee

Markdown for agents: /docs/errors/semantic.unknown_callee.md.Built from Jadpo main at aee2e8f.