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-rw-r--r--020run.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/020run.cc b/020run.cc
index 2f4a2ca4..6a68e360 100644
--- a/020run.cc
+++ b/020run.cc
@@ -336,7 +336,7 @@ inline bool scalar(const vector<double>& x) {
 }
 
 // helper for tests
-void run(string form) {
+void run(const string& form) {
   vector<recipe_ordinal> tmp = load(form);
   transform_all();
   if (tmp.empty()) return;