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-rw-r--r--023boolean.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/023boolean.cc b/023boolean.cc
index 13400c4c..fa962462 100644
--- a/023boolean.cc
+++ b/023boolean.cc
@@ -107,7 +107,7 @@ put(Recipe_ordinal, "not", NOT);
 :(before "End Primitive Recipe Checks")
 case NOT: {
   if (SIZE(inst.products) > SIZE(inst.ingredients)) {
-    raise_error << maybe(get(Recipe, r).name) << "'not' cannot have fewer ingredients than products in '" << inst.to_string() << "'\n" << end();
+    raise_error << maybe(get(Recipe, r).name) << "'not' cannot have fewer ingredients than products in '" << to_string(inst) << "'\n" << end();
     break;
   }
   for (long long int i = 0; i < SIZE(inst.ingredients); ++i) {