Address minor warts

* Mention the need to have `nasm` available on the PATH in the README
* Replace the deprecated `hide_parse_errors` by `show_parse_errors` in `rustfmt.toml`
* Mark unused variables in `src/scheme/proc.rs`

README.md

@@ -6,6 +6,10 @@ Redox OS Microkernel
 [![SLOCs counter](https://tokei.rs/b1/github/redox-os/kernel?category=code)](https://github.com/XAMPPRocky/tokei)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)
 
+## Requirements
+
+* [`nasm`](https://nasm.us/) needs to be available on the PATH at build time.
+
 ## Building The Documentation
 
 Use this command:

rustfmt.toml

@@ -8,7 +8,7 @@ fn_single_line = false # default
 force_explicit_abi = true # default
 format_strings = false # default
 hard_tabs = false # default
-hide_parse_errors = false # default
+show_parse_errors = true # default
 imports_granularity = "Crate" # default = Preserve
 imports_indent = "Block" # default
 imports_layout = "Mixed" # default

src/scheme/proc.rs

@@ -532,7 +532,7 @@ impl<const FULL: bool> KernelScheme for ProcScheme<FULL> {
         match handle {
             Handle::Process {
                 kind: ProcHandle::Trace { pid, .. },
-                process,
+                process: _,
             } => ptrace::Session::with_session(*pid, |session| {
                 Ok(session.data.lock().session_fevent_flags())
             }),
@@ -1519,7 +1519,7 @@ impl ContextHandle {
     }
     fn kreadoff(
         &self,
-        id: usize,
+        _id: usize,
         context: Arc<RwSpinlock<Context>>,
         buf: UserSliceWo,
         offset: u64,