fix: handle Windows paths

Author: alexeagle

test/unit/extra_outdirs/proc_macro.rs

@@ -16,9 +16,18 @@ pub fn write_to_outdirs(_item: TokenStream) -> TokenStream {
     // Write to the output directories declared by Bazel
     for entry in outdirs_paths.split(',') {
         if let Some((_dir, path)) = entry.split_once(':') {
-            let dir_path = PathBuf::from(path.trim());
-
+            let path_str = path.trim();
+            // PathBuf will normalize the path correctly for the current platform
+            // On Windows, ensure forward slashes are converted to backslashes
+            let dir_path = if cfg!(windows) {
+                // Convert forward slashes to backslashes for Windows
+                PathBuf::from(path_str.replace('/', "\\"))
+            } else {
+                PathBuf::from(path_str)
+            };
+            
             // Create the directory if it doesn't exist
+            // create_dir_all creates all parent directories as needed
             if let Err(e) = fs::create_dir_all(&dir_path) {
                 panic!("Failed to create directory {}: {:?}", dir_path.display(), e);
             }