Function obj_integrity_report_failure_at 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn obj_integrity_report_failure_at(
    report: *const obj_integrity_report_t,
    index: usize,
    out_string: *mut *mut u8,
    out_string_len: *mut usize,
) -> obj_error_t

Copy the Debug-formatted text of failure index into a fresh libobj-owned buffer. Caller pairs with obj_free_buffer. Returns OBJ_ERR_NOT_FOUND for an out-of-range index.

Safety

As obj_integrity_report_is_ok plus out_string / out_string_len writable.