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+<span class="Comment">//: Some simple sanity checks for types, and also attempts to guess them where</span>
+<span class="Comment">//: they aren't provided.</span>
+<span class="Comment">//:</span>
+<span class="Comment">//: You still have to provide the full type the first time you mention a</span>
+<span class="Comment">//: variable in a recipe. You have to explicitly name :offset and :variant</span>
+<span class="Comment">//: every single time. You can't use the same name with multiple types in a</span>
+<span class="Comment">//: single recipe.</span>
+
+<span class="Delimiter">:(scenario transform_types_warns_on_reusing_name_with_different_type)</span>
+<span class="Special">% Hide_warnings = true;</span>
+recipe main [
+  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
+  x:boolean<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
+]
+<span class="traceContains">+warn: x used with multiple types in main</span>
+
+<span class="Delimiter">:(after &quot;int main&quot;)</span>
+  Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>transform_types<span class="Delimiter">);</span>
+
+<span class="Delimiter">:(code)</span>
+void transform_types<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt; metadata<span class="Delimiter">;</span>
+  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+    for <span class="Delimiter">(</span>long long int in = <span class="Constant">0</span><span class="Delimiter">;</span> in &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      deduce_missing_type<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+      check_metadata<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">),</span> r<span class="Delimiter">);</span>
+    <span class="Delimiter">}</span>
+    for <span class="Delimiter">(</span>long long int out = <span class="Constant">0</span><span class="Delimiter">;</span> out &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      deduce_missing_type<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">));</span>
+      check_metadata<span class="Delimiter">(</span>metadata<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">),</span> r<span class="Delimiter">);</span>
+    <span class="Delimiter">}</span>
+  <span class="Delimiter">}</span>
+<span class="Delimiter">}</span>
+
+void check_metadata<span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt;&amp; metadata<span class="Delimiter">,</span> const reagent&amp; x<span class="Delimiter">,</span> const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  if <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>is_raw<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+  <span class="Comment">// if you use raw locations you're probably doing something unsafe</span>
+  if <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// will throw a more precise warning elsewhere</span>
+  if <span class="Delimiter">(</span>metadata<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == metadata<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
+    metadata[x<span class="Delimiter">.</span>name] = x<span class="Delimiter">.</span>types<span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>metadata[x<span class="Delimiter">.</span>name] != x<span class="Delimiter">.</span>types<span class="Delimiter">)</span>
+    raise &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; used with multiple types in &quot;</span> &lt;&lt; Recipe[r]<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(scenario transform_types_fills_in_missing_types)</span>
+recipe main [
+  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
+  y:number<span class="Special"> &lt;- </span>add x<span class="Delimiter">,</span> <span class="Constant">1</span>
+]
+
+<span class="Delimiter">:(code)</span>
+void deduce_missing_type<span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt;&amp; metadata<span class="Delimiter">,</span> reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  if <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>metadata<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == metadata<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+  copy<span class="Delimiter">(</span>metadata[x<span class="Delimiter">.</span>name]<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> metadata[x<span class="Delimiter">.</span>name]<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>x<span class="Delimiter">.</span>types<span class="Delimiter">,</span> x<span class="Delimiter">.</span>types<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
+  assert<span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;as-before&quot;</span><span class="Delimiter">);</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(scenario transform_types_fills_in_missing_types_in_product)</span>
+recipe main [
+  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
+  x<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>
+]
+
+<span class="Delimiter">:(scenario transform_types_fills_in_missing_types_in_product_and_ingredient)</span>
+recipe main [
+  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
+  x<span class="Special"> &lt;- </span>add x<span class="Delimiter">,</span> <span class="Constant">1</span>
+]
+<span class="traceContains">+mem: storing 2 in location 1</span>
+
+<span class="Delimiter">:(scenario transform_warns_on_missing_types_in_first_mention)</span>
+<span class="Special">% Hide_warnings = true;</span>
+recipe main [
+  x<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
+  x:number<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>
+]
+<span class="traceContains">+warn: missing type in 'x &lt;- copy 1'</span>
+<span class="traceContains">+warn: x &lt;- copy 1: reagent not initialized: x</span>
+<span class="traceContains">+warn: main: size mismatch in storing to x at 'x &lt;- copy 1'</span>
+</pre>
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