cue eval data: foo.cue
cmp stdout expect-data-foo

! cue eval data: bar.cue
cmp stderr expect-data-bar

cue eval graph: bar.cue
cmp stdout expect-graph-bar

-- foo.cue --
a: 4
b: {
    c: 1
}
// Duplicates are still allowed.
b: {
    d: 2
}

-- bar.cue --
a: 4
b: {
    c: a
}

-- expect-data-foo --
a: 4
b: {
    c: 1
    d: 2
}
-- expect-data-bar --
references not allowed in data mode:
    ./bar.cue:3:8
-- expect-graph-bar --
a: 4
b: {
    c: 4
}