cue eval -ic defs.cue
cmp stdout expect-stdout-cue

-- frontmatter.toml --
title = "Definitions"
description = ""

-- text.md --
A definition, denoted with `::` instead of `:`, defines values that
are not output when converting a configuration to a concrete value.
They are used to define schemata against which concrete values can
be validated.

Structs defined by definitions are implicitly closed.

-- defs.cue --
msg: "Hello \(Name)!"

Name :: "world"

A :: {
    field: int
}

a:   A & { field: 3 }
err: A & { feild: 3 }

-- expect-stdout-cue --
msg: "Hello world!"
a: {
    field: 3
}
err: _|_ // field "feild" not allowed in closed struct