-------- @freevars fv1 --------
Free identifiers:
type C
const exp int
var x int

-------- @freevars fv2 --------
Free identifiers:
var s.t.a int
var s.t.b int
var s.x int
var x int
var y rune

-------- @freevars fv3 --------
Free identifiers:
var x int

-------- @freevars fv-def-label --------
No free identifiers.

-------- @freevars fv-ref-label --------
Free identifiers:
label loop