Fix license allow list and clippy warning

Author: encounter

bin/src/main.rs

@@ -21,13 +21,13 @@ struct Args {
 
 fn main() -> Result<(), &'static str> {
     let args: Args = from_env();
-    return if let Some(symbol) = demangle(args.symbol.as_str(), &DemangleOptions {
+    if let Some(symbol) = demangle(args.symbol.as_str(), &DemangleOptions {
         omit_empty_parameters: !args.keep_void,
         mw_extensions: args.mw_extensions,
     }) {
         println!("{symbol}");
         Ok(())
     } else {
         Err("Failed to demangle symbol")
-    };
+    }
 }

deny.toml

@@ -92,7 +92,7 @@ allow = [
     "MIT",
     "Apache-2.0",
     "BSD-3-Clause",
-    "Unicode-DFS-2016",
+    "Unicode-3.0",
 ]
 # The confidence threshold for detecting a license from license text.
 # The higher the value, the more closely the license text must be to the

lib/src/lib.rs

@@ -426,8 +426,8 @@ pub fn demangle(mut str: &str, options: &DemangleOptions) -> Option<String> {
         }
         let rest = &rest[1..];
         if let Some((_, rest2)) = parse_digits(rest) {
-            if rest2.starts_with('@') {
-                let fn_demangled = demangle(&rest2[1..], options)?;
+            if let Some(stripped) = rest2.strip_prefix('@') {
+                let fn_demangled = demangle(stripped, options)?;
                 thunk_res = Some(format!("virtual thunk to {fn_demangled}"));
             }
         }