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

`syntax.increment_operator`

Variable changed with ++, -- or +=.

Area 3, Logic; not declinable; the next step is usually the agent's.

A var mut changes with =, and a named type converts the result back with its constructor.

example

type Count = Int {    min: 0}function bumped(count: Count) -> Count {    var mut next: Count = count    next++    return next}

jadpo checkcheck failed: 1 error, 1 file

error Jadpo writes next = next + 1, not next++

--> main.jadpo:7:9

  |7 |     next++  |         ^^ write `next = next + 1`

reason: ++, --, +=, -= and *= change a variable in place in JavaScript, Java, C#, Go, Kotlin, Swift and Python; Jadpo assigns a var mut with =, and a named type converts the result back with its constructor, as in count = Count(count + 1).
next: Write next = next + 1 (agent)
rule: syntax.increment_operator
help: https://jadpo.dev/docs/errors/syntax.increment_operator

Markdown for agents: /docs/errors/syntax.increment_operator.md.Built from Jadpo main at aee2e8f.