fn_0  ...
fn_0  wrapper pre ()
fn_0  wrapper post1 = 0
fn_0  wrapper post2 = 0
      ...  0

fn_1  ...
fn_1  wrapper pre ( 42 )
fn_1  wrapper post1 = -13631437
fn_1  wrapper post2 = -13631437
      ...  -13631437

fn_2  ...
fn_2  wrapper pre ( 42, 43 )
fn_2  wrapper post1 = 201956282
fn_2  wrapper post2 = 201956282
      ...  201956282