cleaned up all compiler warnings

src/libsh/sys.rs

@@ -3,35 +3,6 @@ use std::sync::LazyLock;
 use termios::{LocalFlags, Termios};
 
 use crate::prelude::*;
-///
-/// The previous state of the terminal options.
-///
-/// This variable stores the terminal settings at the start of the program and
-/// restores them when the program exits. It is initialized exactly once at the
-/// start of the program and accessed exactly once at the end of the program. It
-/// will not be mutated or accessed under any other circumstances.
-///
-/// This ended up being necessary because wrapping Termios in a thread-safe way
-/// was unreasonably tricky.
-///
-/// The possible states of this variable are:
-/// - `None`: The terminal options have not been set yet (before
-///   initialization).
-/// - `Some(None)`: There were no terminal options to save (i.e., no terminal
-///   input detected).
-/// - `Some(Some(Termios))`: The terminal options (as `Termios`) have been
-///   saved.
-///
-/// **Important:** This static variable is mutable and accessed via unsafe code.
-/// It is only safe to use because:
-/// - It is set once during program startup and accessed once during program
-///   exit.
-/// - It is not mutated or accessed after the initial setup and final read.
-///
-/// **Caution:** Future changes to this code should respect these constraints to
-/// ensure safety. Modifying or accessing this variable outside the defined
-/// lifecycle could lead to undefined behavior.
-pub(crate) static mut SAVED_TERMIOS: Option<Option<Termios>> = None;
 
 pub static TTY_FILENO: LazyLock<RawFd> = LazyLock::new(|| {
   open("/dev/tty", OFlag::O_RDWR, Mode::empty()).expect("Failed to open /dev/tty")