rust: Update to gio 0.16

This was quite seamless; the only thing I had to tweak was adding
`+ Send` bounds in the `Box<dyn Error>` manual checksum_async API.

rust-bindings/sys/tests/abi.rs

@@ -40,7 +40,7 @@ impl Compiler {
         cmd.arg(out);
         let status = cmd.spawn()?.wait()?;
         if !status.success() {
-            return Err(format!("compilation command {:?} failed, {}", &cmd, status).into());
+            return Err(format!("compilation command {cmd:?} failed, {status}").into());
         }
         Ok(())
     }
@@ -56,7 +56,7 @@ fn get_var(name: &str, default: &str) -> Result<Vec<String>, Box<dyn Error>> {
     match env::var(name) {
         Ok(value) => Ok(shell_words::split(&value)?),
         Err(env::VarError::NotPresent) => Ok(shell_words::split(default)?),
-        Err(err) => Err(format!("{} {}", name, err).into()),
+        Err(err) => Err(format!("{name} {err}").into()),
     }
 }
 
@@ -70,7 +70,7 @@ fn pkg_config_cflags(packages: &[&str]) -> Result<Vec<String>, Box<dyn Error>> {
     cmd.args(packages);
     let out = cmd.output()?;
     if !out.status.success() {
-        return Err(format!("command {:?} returned {}", &cmd, out.status).into());
+        return Err(format!("command {cmd:?} returned {}", out.status).into());
     }
     let stdout = str::from_utf8(&out.stdout)?;
     Ok(shell_words::split(stdout.trim())?)
@@ -115,13 +115,8 @@ fn cross_validate_constants_with_c() {
     let mut c_constants: Vec<(String, String)> = Vec::new();
 
     for l in get_c_output("constant").unwrap().lines() {
-        let mut words = l.trim().split(';');
-        let name = words.next().expect("Failed to parse name").to_owned();
-        let value = words
-            .next()
-            .and_then(|s| s.parse().ok())
-            .expect("Failed to parse value");
-        c_constants.push((name, value));
+        let (name, value) = l.split_once(';').expect("Missing ';' separator");
+        c_constants.push((name.to_owned(), value.to_owned()));
     }
 
     let mut results = Results::default();
@@ -131,15 +126,14 @@ fn cross_validate_constants_with_c() {
     {
         if rust_name != c_name {
             results.record_failed();
-            eprintln!("Name mismatch:\nRust: {:?}\nC:    {:?}", rust_name, c_name,);
+            eprintln!("Name mismatch:\nRust: {rust_name:?}\nC:    {c_name:?}");
             continue;
         }
 
         if rust_value != c_value {
             results.record_failed();
             eprintln!(
-                "Constant value mismatch for {}\nRust: {:?}\nC:    {:?}",
-                rust_name, rust_value, &c_value
+                "Constant value mismatch for {rust_name}\nRust: {rust_value:?}\nC:    {c_value:?}",
             );
             continue;
         }
@@ -156,17 +150,11 @@ fn cross_validate_layout_with_c() {
     let mut c_layouts = Vec::new();
 
     for l in get_c_output("layout").unwrap().lines() {
-        let mut words = l.trim().split(';');
-        let name = words.next().expect("Failed to parse name").to_owned();
-        let size = words
-            .next()
-            .and_then(|s| s.parse().ok())
-            .expect("Failed to parse size");
-        let alignment = words
-            .next()
-            .and_then(|s| s.parse().ok())
-            .expect("Failed to parse alignment");
-        c_layouts.push((name, Layout { size, alignment }));
+        let (name, value) = l.split_once(';').expect("Missing first ';' separator");
+        let (size, alignment) = value.split_once(';').expect("Missing second ';' separator");
+        let size = size.parse().expect("Failed to parse size");
+        let alignment = alignment.parse().expect("Failed to parse alignment");
+        c_layouts.push((name.to_owned(), Layout { size, alignment }));
     }
 
     let mut results = Results::default();
@@ -175,16 +163,13 @@ fn cross_validate_layout_with_c() {
     {
         if rust_name != c_name {
             results.record_failed();
-            eprintln!("Name mismatch:\nRust: {:?}\nC:    {:?}", rust_name, c_name,);
+            eprintln!("Name mismatch:\nRust: {rust_name:?}\nC:    {c_name:?}");
             continue;
         }
 
         if rust_layout != c_layout {
             results.record_failed();
-            eprintln!(
-                "Layout mismatch for {}\nRust: {:?}\nC:    {:?}",
-                rust_name, rust_layout, &c_layout
-            );
+            eprintln!("Layout mismatch for {rust_name}\nRust: {rust_layout:?}\nC:    {c_layout:?}",);
             continue;
         }
 
@@ -205,7 +190,7 @@ fn get_c_output(name: &str) -> Result<String, Box<dyn Error>> {
     let mut abi_cmd = Command::new(exe);
     let output = abi_cmd.output()?;
     if !output.status.success() {
-        return Err(format!("command {:?} failed, {:?}", &abi_cmd, &output).into());
+        return Err(format!("command {abi_cmd:?} failed, {output:?}").into());
     }
 
     Ok(String::from_utf8(output.stdout)?)