const i8 compilation error

[argulp]

Hi
I'm not a rust expert, but during cargo build:
error[E0308]: mismatched types
--> src/main.rs:186:28
|
186 | let fd = unsafe { open(path.as_ref().as_os_str().as_bytes().as_ptr() as *const i8, O_RDWR) };
| ---- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected u8, found i8
| |
| arguments to this function are incorrect
|
= note: expected raw pointer *const u8
found raw pointer *const i8
note: function defined here
--> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.72/src/unix/mod.rs:718:12
|
718 | pub fn open(path: *const c_char, oflag: ::c_int, ...) -> ::c_int;
| ^^^^

switching i8 to u8 fix the issue

Rgds