#name: convert _ to top
#evalPartial
-- in.cue --
a: {[_]: _}
-- out/def --
a: {
	...
}
-- out/export --
a: {}
-- out/yaml --
a: {}
-- out/json --
{"a":{}}
-- out/legacy-debug --
<0>{a: <1>{...}}
-- out/compile --
--- in.cue
{
  a: {
    [_]: _
  }
}
-- out/eval/stats --
Leaks:  0
Freed:  2
Reused: 0
Allocs: 2
Retain: 0

Unifications: 2
Conjuncts:    2
Disjuncts:    2
-- out/eval --
(struct){
  a: (struct){
  }
}
