function {:existential true} {:inline} b1(x: bool) : bool
{
  !x
}
function {:existential true} {:inline} b2(x: bool) : bool
{
  x
}
function {:existential true} {:inline} b3(x: bool) : bool
{
  !x
}
function {:existential true} {:inline} b4(x: bool) : bool
{
  x
}
function {:existential true} {:inline} b5() : bool
{
  false
}
function {:existential true} {:inline} Assert() : bool
{
  false
}

Boogie program verifier finished with 1 verified, 0 errors