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

ErrorsValues and types · rule

type.type_argument_count

Type has the wrong number of type arguments.

Area 2, Values and types; not declinable; the next step is usually the agent's.

example
type Tag = Text {    max_length: 30}type Basket = Object {    tags: List<Tag, Tag>}
jadpo checkcheck failed: 1 error, 1 file

error List takes one type argument, as in List<Tag>

--> main.jadpo:6:11

  |6 |     tags: List<Tag, Tag>  |           ^^^^^^^^^^^^^^ 2 given
reason
List holds values of the type in < >, so it needs exactly 1.
next
Write List with one type argument, as in List<Tag> (agent)
rule
type.type_argument_count
help
https://jadpo.dev/docs/errors/type.type_argument_count

Markdown for agents: /docs/errors/type.type_argument_count.md.Built from Jadpo main at aee2e8f.