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-rw-r--r--027call_ingredient.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/027call_ingredient.cc b/027call_ingredient.cc
index fe9db13c..b9195658 100644
--- a/027call_ingredient.cc
+++ b/027call_ingredient.cc
@@ -172,7 +172,8 @@ case INGREDIENT: {
 
 //: a particularly common array type is the string, or address:array:character
 :(code)
-bool is_mu_string(const reagent& x) {
+bool is_mu_string(reagent/*copy*/ x) {
+  // Begin is_mu_string(x)
   return x.type
     && x.type->value == get(Type_ordinal, "address")
     && x.type->right