qualif Zog(v:a, z:b) : (v = z)

bind 0 x : {v : int | true}
bind 1 q : {v : int | true}
bind 2 y : {v : int | v = 10}

constraint:
  env [1]
  lhs {v : int | v = q}
  rhs {v : int | $k0[x:=q] }
  id 1 tag []

constraint:
  env [2]
  lhs {v : int | $k0[x:=y]}
  rhs {v : int | v = 10}
  id 2 tag []

wf:
  env [0]
  reft {v : int | $k0}