Function guile_sys::scm_bitvector_writable_elements

pub unsafe extern "C" fn scm_bitvector_writable_elements(
    vec: SCM, 
    h: *mut scm_t_array_handle, 
    offp: *mut usize, 
    lenp: *mut usize, 
    incp: *mut isize
) -> *mut scm_t_uint32