single scope again

src/main.rs

@@ -29,21 +29,21 @@ fn main() -> Result<(), Box<dyn Error>> {
     let args = Args::parse();
 
     #[cfg(not(windows))]
-    let boot_folder = args
-        .boot_directory
-        .or_else(|| PathBuf::from_str(BOOT_PATH).ok());
-
-    #[cfg(not(windows))]
-    let boot_folder = unsafe { boot_folder.unwrap_unchecked() };
+    let boot_folder = unsafe {
+        args.boot_directory
+            .or_else(|| PathBuf::from_str(BOOT_PATH).ok())
+            .unwrap_unchecked()
+    };
 
     #[cfg(windows)]
+    let boot_folder = {
         if args.boot_directory.is_none() {
             eprintln!("You must supply a boot-directory on windows; see --help");
             exit(1);
         }
 
-    #[cfg(windows)]
-    let boot_folder = unsafe { args.boot_directory.unwrap_unchecked() };
+        unsafe { args.boot_directory.unwrap_unchecked() }
+    };
 
     let grub_env = boot_folder.join("grub/grubenv");