ng_region: no need to copy enters

diff --git a/src/nfagraph/ng_region.cpp b/src/nfagraph/ng_region.cpp
index 6fef9aa9da71b970cf9b3cac9a3644a4472a5aaf..91904b4662959a2611e2eb916361541bb7b4a38a 100644 (file)
--- a/src/nfagraph/ng_region.cpp
+++ b/src/nfagraph/ng_region.cpp
@@ -194,7 +194,9 @@ void buildInitialCandidate(const AcyclicGraph &g,
         return;
     }
 
-    auto enters = exits.front().open; // copy
+    // Note: findExits() will clear exits, so it's safe to mutate/move its
+    // elements here.
+    auto &enters = exits.front().open;
     candidate.clear();
 
     for (; it != ite; ++it) {