pub unsafe fn zstein(
n: i32,
d: &[f64],
e: &[f64],
m: i32,
w: &[f64],
iblock: &[i32],
isplit: &[i32],
z: &mut [c64],
ldz: i32,
work: &mut [f64],
iwork: &mut [i32],
ifail: &mut [i32],
info: &mut i32,
)