-- in.cue --
{
	#a: {b: 2.0, s: "abc"}
	b: #a.b
	c: #a.c
	d: #a["d"]
	e: #a.t[2:3]
}
-- out/def --
#a: {
	b: 2.0
	s: "abc"
}
b: 2.0
c: _|_ // undefined field "c"
d: _|_ // undefined field "d"
e: _|_ // undefined field "t"
-- out/compile --
--- in.cue
{
  {
    #a: {
      b: 2.0
      s: "abc"
    }
    b: 〈0;#a〉.b
    c: 〈0;#a〉.c
    d: 〈0;#a〉["d"]
    e: 〈0;#a〉.t[2:3]
  }
}
-- out/eval/stats --
Leaks:  0
Freed:  8
Reused: 5
Allocs: 3
Retain: 0

Unifications: 8
Conjuncts:    10
Disjuncts:    8
-- out/eval --
Errors:
c: undefined field: c:
    ./in.cue:4:8
d: undefined field: d:
    ./in.cue:5:8
e: undefined field: t:
    ./in.cue:6:8

Result:
(_|_){
  // [eval]
  #a: (#struct){
    b: (float){ 2.0 }
    s: (string){ "abc" }
  }
  b: (float){ 2.0 }
  c: (_|_){
    // [eval] c: undefined field: c:
    //     ./in.cue:4:8
  }
  d: (_|_){
    // [eval] d: undefined field: d:
    //     ./in.cue:5:8
  }
  e: (_|_){
    // [eval] e: undefined field: t:
    //     ./in.cue:6:8
  }
}