prevent generating duplicate stubs

Author: tinaun

src/tools/tidy/src/unstable_book.rs

@@ -87,7 +87,7 @@ pub fn check(path: &path::Path, bad: &mut bool) {
     // Library features
 
     let lang_features = collect_lang_features(path);
-    let lib_features = collect_lib_features(path).iter().filter(|(name, _) {
+    let lib_features = collect_lib_features(path).into_iter().filter(|&(ref name, _)| {
         !lang_features.contains_key(name)
     }).collect();
 

src/tools/unstable-book-gen/src/main.rs

@@ -129,11 +129,9 @@ fn main() {
     let dest_path = Path::new(&dest_path_str).join("src");
 
     let lang_features = collect_lang_features(src_path);
-    let lib_features = collect_lib_features(src_path)
-                                            .iter()
-                                            .filter(|(name, _) {
-                                                !lang_features.contains_key(name)
-                                            }).collect();
+    let lib_features = collect_lib_features(src_path).into_iter().filter(|&(ref name, _)| {
+        !lang_features.contains_key(name)
+    }).collect();
 
     let doc_src_path = src_path.join(PATH_STR);