Fix compile error caused by updated Step::steps_between in Rust

kernel/comps/block/src/id.rs

@@ -89,7 +89,7 @@ impl<const N: u16> Sub<u64> for BlockId<N> {
 
 /// Implements the `Step` trait to iterate over `Range<Id>`.
 impl<const N: u16> Step for BlockId<N> {
-    fn steps_between(start: &Self, end: &Self) -> Option<usize> {
+    fn steps_between(start: &Self, end: &Self) -> (usize, Option<usize>) {
         u64::steps_between(&start.0, &end.0)
     }
 

kernel/comps/framebuffer/src/lib.rs

@@ -3,7 +3,6 @@
 //! The framebuffer of Asterinas.
 #![no_std]
 #![deny(unsafe_code)]
-#![feature(strict_provenance)]
 
 extern crate alloc;
 

kernel/src/lib.rs

@@ -9,7 +9,6 @@
 #![allow(incomplete_features)]
 #![feature(btree_cursors)]
 #![feature(btree_extract_if)]
-#![feature(const_option)]
 #![feature(extend_one)]
 #![feature(fn_traits)]
 #![feature(format_args_nl)]

kernel/src/syscall/select.rs

@@ -108,9 +108,9 @@ fn do_select(
         let mut poll_fds = Vec::with_capacity(nfds as usize);
         for fd in 0..nfds {
             let events = {
-                let readable = readfds.as_ref().map_or(false, |fds| fds.is_set(fd));
-                let writable = writefds.as_ref().map_or(false, |fds| fds.is_set(fd));
-                let except = exceptfds.as_ref().map_or(false, |fds| fds.is_set(fd));
+                let readable = readfds.as_ref().is_some_and(|fds| fds.is_set(fd));
+                let writable = writefds.as_ref().is_some_and(|fds| fds.is_set(fd));
+                let except = exceptfds.as_ref().is_some_and(|fds| fds.is_set(fd));
                 convert_rwe_to_events(readable, writable, except)
             };