From e46306432ddb75a89f69d92ccc175a23f0b72072 Mon Sep 17 00:00:00 2001
From: "Kartik K. Agaram" <vc@akkartik.com>
Date: Sat, 25 Jul 2015 14:19:28 -0700
Subject: 1848 - core instructions now check for ingredients

Also standardized warnings.
---
 027trace.cc | 4 ++++
 1 file changed, 4 insertions(+)

(limited to '027trace.cc')

diff --git a/027trace.cc b/027trace.cc
index 12cc7ca3..742432fa 100644
--- a/027trace.cc
+++ b/027trace.cc
@@ -12,6 +12,10 @@ TRACE,
 Recipe_ordinal["trace"] = TRACE;
 :(before "End Primitive Recipe Implementations")
 case TRACE: {
+  if (SIZE(ingredients) != 2) {
+    raise << current_recipe_name() << ": 'trace' takes exactly two ingredients rather than '" << current_instruction().to_string() << "'\n" << end();
+    break;
+  }
   assert(is_literal(current_instruction().ingredients.at(0)));
   string label = current_instruction().ingredients.at(0).name;
   assert(is_literal(current_instruction().ingredients.at(1)));
-- 
cgit 1.4.1-2-gfad0