// Optional fields should retain status after removal of unified
// content.

// Issue #855

-- cue.mod/module.cue --
module: "mod.com"
-- a.cue --
package pkg

a: [...#A]

a: [{
	annotations: {}
}]

#A: annotations?: [string]: string

b: #B
b: bb: c: 2 // c can be removed, bb not.
#B: bb?: c: 2

-- out/trim --
== a.cue
package pkg

a: [...#A]

a: [{
	annotations: {}
}]

#A: annotations?: [string]: string

b:        #B
b: bb: {} // c can be removed, bb not.
#B: bb?: c: 2