linked lists

src/main.rs

@@ -122,7 +122,7 @@ fn main() {
             "rustc_hir_typeck,rustc_infer,rustc_next_trait_solver,rustc_middle,rustc_traits,rustc_trait_selection,rustc_type_ir,rustc_ty_utils".to_string()
         }
         Preset::All => "debug".to_string(),
-        Preset::Crates { crates } => format!("{}", crates.join(",")),
+        Preset::Crates { crates } => crates.join(",").to_string(),
     };
 
     let (first, rest) = {