! cue eval foo.cue
cmp stderr expect-stderr

! cue export foo.cue
cmp stderr expect-stderr

cue fmt foo.cue
cmp foo.cue foo-new.cue

-- expect-stderr --
old-style comprehensions deprecated as of v0.0.11: try running `cue fmt` on the file to upgrade.:
    ./foo.cue:1:8
-- foo.cue --
"x": 3 for x in a
-- foo-new.cue --

for x in a {
	"x": 3
}