-- in.cue --
a: *1 | int
aa: *1 | *2 | int

b: {
	name: "int"
	val: int
} | {
	name: "str"
	val: string
}

d: b & { val: 3 }
c: b & { name: "int", val: 3 }
e: b & { val: "foo" }
f: b & { name: "str", val: 3 }

-- out/eval --
Errors:
invalid value string (mismatched types string and int)

Result:
(_|_){
  // [eval]
  a: (int){ |(*(int){ 1 }, (int){ int }) }
  aa: (int){ |(*(int){ 1 }, *(int){ 2 }, (int){ int }) }
  b: (struct){ |((struct){
      name: (string){ "int" }
      val: (int){ int }
    }, (struct){
      name: (string){ "str" }
      val: (string){ string }
    }) }
  d: (struct){
    val: (int){ 3 }
    name: (string){ "int" }
  }
  c: (struct){
    name: (string){ "int" }
    val: (int){ 3 }
  }
  e: (struct){
    val: (string){ "foo" }
    name: (string){ "str" }
  }
  f: (_|_){
    // [eval]
    name: (string){ "str" }
    val: (_|_){
      // [eval] invalid value string (mismatched types string and int)
    }
  }
}
-- out/compile --
--- in.cue
{
  a: (*1|int)
  aa: (*1|*2|int)
  b: ({
    name: "int"
    val: int
  }|{
    name: "str"
    val: string
  })
  d: (〈0;b〉 & {
    val: 3
  })
  c: (〈0;b〉 & {
    name: "int"
    val: 3
  })
  e: (〈0;b〉 & {
    val: "foo"
  })
  f: (〈0;b〉 & {
    name: "str"
    val: 3
  })
}