misc: get rid of some errors from Cargo lol

assembler/src/main.rs

@@ -1,3 +1,7 @@
+use common as _;
+use num_cpus as _;
+use threadpool as _;
+
 use assembler::{
     prelude::*,
     tooling::{brainf, project},
@@ -19,7 +23,7 @@ fn main() {
 
         let mut file = match fs::File::create("brainf.dsb") {
             Err(e) => {
-                eprintln!("Failed to create output file: {}", e);
+                eprintln!("Failed to create output file: {e}");
                 std::process::exit(1);
             }
             Ok(file) => file,
@@ -27,7 +31,7 @@ fn main() {
 
         for instruction in result {
             if let Err(e) = file.write(&instruction.encode().to_be_bytes()) {
-                eprintln!("Failed to write to output file: {}", e);
+                eprintln!("Failed to write to output file: {e}");
                 std::process::exit(1);
             }
         }
@@ -53,7 +57,7 @@ fn main() {
 
     for instruction in result {
         if let Err(e) = fs::write(output_path, instruction.encode().to_be_bytes()) {
-            eprintln!("Failed to write to output file: {}", e);
+            eprintln!("Failed to write to output file: {e}");
             std::process::exit(1);
         }
     }