Bump rust version so we can build mdbook again.

Author: gz

kernel/src/arch/x86_64/irq.rs

@@ -272,7 +272,7 @@ pub unsafe fn setup_early_idt() {
 ///
 /// # See also
 /// Described in Intel SDM 3a, Figure 6-8. IA-32e Mode Stack Usage After Privilege Level Change
-#[repr(C, packed)]
+#[repr(C)]
 pub struct ExceptionArguments {
     _reserved: u64,
     vector: u64,

kernel/src/main.rs

@@ -21,7 +21,6 @@
     allocator_api,
     linkage,
     c_variadic,
-    box_into_pin,
     drain_filter,
     new_uninit,
     get_mut_unchecked,
@@ -30,7 +29,6 @@
     nonnull_slice_from_raw_parts,
     cell_update,
     thread_local,
-    let_chains,
     generic_associated_types,
     maybe_uninit_write_slice
 )]

rust-toolchain

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly-2022-04-01"
+channel = "nightly-2022-07-21"
 components = [ "rustfmt", "rustc-dev", "rust-src", "cargo", "clippy" ]
 profile = "default"