Explicitly use std::move to make clang 3.5 compile

src/iindexer.cc

@@ -68,7 +68,7 @@ struct TestIndexer : IIndexer {
     // specific file (atm it is always 1)
     auto result = std::move(it->second);
     indexes.erase(it);
-    return result;
+    return std::move(result);
   }
 
   std::unordered_map<std::string, std::vector<std::unique_ptr<IndexFile>>>

src/indexer.cc

@@ -1904,7 +1904,7 @@ optional<std::vector<std::unique_ptr<IndexFile>>> Parse(
     ClangIndex* index,
     bool dump_ast) {
   if (!config->enableIndexing)
-    return {};
+    return nullopt;
 
   file = NormalizePath(file);