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-rw-r--r--cpp/010vm5
1 files changed, 4 insertions, 1 deletions
diff --git a/cpp/010vm b/cpp/010vm
index a734305f..ee8be9cb 100644
--- a/cpp/010vm
+++ b/cpp/010vm
@@ -112,10 +112,13 @@ const int COPY = 1;
 // what to do for them.
 void setup_recipes() {
   Recipe.clear();  Recipe_number.clear();
+  Next_recipe_number = 0;
   Recipe_number["idle"] = IDLE;
-  Next_recipe_number = 1;
+  assert(Next_recipe_number == IDLE);
+  Next_recipe_number++;
   // Primitive Recipe Numbers.
   Recipe_number["copy"] = COPY;
+  assert(Next_recipe_number == COPY);
   Next_recipe_number++;
   // End Primitive Recipe Numbers.
 }