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* 5852Kartik Agaram2020-01-011-0/+166
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<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="Comment">//: Reclaiming memory when it's no longer used.</span>
<span id="L2" class="LineNr">  2 </span>
<span id="L3" class="LineNr">  3 </span><span class="Delimiter">:(scenario new_reclaim)</span>
<span id="L4" class="LineNr">  4 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L5" class="LineNr">  5 </span>  <span class="Constant">10</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L6" class="LineNr">  6 </span>  <span class="Constant">20</span>:num<span class="Special"> &lt;- </span>deaddress <span class="Constant">10</span>:&amp;:num
<span id="L7" class="LineNr">  7 </span>  <a href='036abandon.cc.html#L63'>abandon</a> <span class="Constant">10</span>:&amp;:num
<span id="L8" class="LineNr">  8 </span>  <span class="Constant">30</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>  <span class="Comment"># must be same size as abandoned memory to reuse</span>
<span id="L9" class="LineNr">  9 </span>  <span class="Constant">40</span>:num<span class="Special"> &lt;- </span>deaddress <span class="Constant">30</span>:&amp;:num
<span id="L10" class="LineNr"> 10 </span>  <span class="Constant">50</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">20</span>:num<span class="Delimiter">,</span> <span class="Constant">40</span>:num
<span id="L11" class="LineNr"> 11 </span>]
<span id="L12" class="LineNr"> 12 </span><span class="Comment"># both allocations should have returned the same address</span>
<span id="L13" class="LineNr"> 13 </span><span class="traceContains">+mem: storing 1 in location 50</span>
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment">//: When abandoning addresses we'll save them to a 'free list', segregated by size.</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment">//: Before, suppose variable V contains address A which points to payload P:</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment">//:   location V contains an alloc-id N</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment">//:   location V+1 contains A</span>
<span id="L20" class="LineNr"> 20 </span><span class="Comment">//:   location A contains alloc-id N</span>
<span id="L21" class="LineNr"> 21 </span><span class="Comment">//:   location A+1 onwards contains P</span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment">//: Additionally, suppose the head of the free list is initially F.</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">//: After abandoning:</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment">//:   location V contains invalid alloc-id -1</span>
<span id="L25" class="LineNr"> 25 </span><span class="Comment">//:   location V+1 contains 0</span>
<span id="L26" class="LineNr"> 26 </span><span class="Comment">//:   location A contains invalid alloc-id N</span>
<span id="L27" class="LineNr"> 27 </span><span class="Comment">//:   location A+1 contains the previous head of free-list F</span>
<span id="L28" class="LineNr"> 28 </span>
<span id="L29" class="LineNr"> 29 </span><span class="Delimiter">:(before &quot;End routine Fields&quot;)</span>
<span id="L30" class="LineNr"> 30 </span>map&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt; free_list<span class="Delimiter">;</span>
<span id="L31" class="LineNr"> 31 </span>
<span id="L32" class="LineNr"> 32 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
<span id="L33" class="LineNr"> 33 </span>ABANDON<span class="Delimiter">,</span>
<span id="L34" class="LineNr"> 34 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
<span id="L35" class="LineNr"> 35 </span><a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;abandon&quot;</span><span class="Delimiter">,</span> ABANDON<span class="Delimiter">);</span>
<span id="L36" class="LineNr"> 36 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span id="L37" class="LineNr"> 37 </span><span class="Normal">case</span> ABANDON: <span class="Delimiter">{</span>
<span id="L38" class="LineNr"> 38 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L39" class="LineNr"> 39 </span>    <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'abandon' shouldn't write to any products in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L40" class="LineNr"> 40 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L41" class="LineNr"> 41 </span>  <span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L43" class="LineNr"> 43 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_address<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
<span id="L44" class="LineNr"> 44 </span>      <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredients of 'abandon' should be addresses, but ingredient &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; is '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L45" class="LineNr"> 45 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L46" class="LineNr"> 46 </span>  <span class="Delimiter">}</span>
<span id="L47" class="LineNr"> 47 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L48" class="LineNr"> 48 </span><span class="Delimiter">}</span>
<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span id="L50" class="LineNr"> 50 </span><span class="Normal">case</span> ABANDON: <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span><a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L52" class="LineNr"> 52 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = <a href='026call.cc.html#L89'>current_instruction</a><span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L53" class="LineNr"> 53 </span>    <a href='035lookup.cc.html#L66'>canonize</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
<span id="L54" class="LineNr"> 54 </span>    <a href='036abandon.cc.html#L63'>abandon</a><span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> ingredient<span class="Delimiter">.</span>value+<span class="Comment">/*</span><span class="Comment">skip alloc id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">),</span> <a href='036abandon.cc.html#L75'>payload_size</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">));</span>
<span id="L55" class="LineNr"> 55 </span><span class="CommentedCode">//?     cerr &lt;&lt; &quot;clear after abandon: &quot; &lt;&lt; ingredient.value &lt;&lt; '\n';</span>
<span id="L56" class="LineNr"> 56 </span>    <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">alloc id</span><span class="Comment">*/</span>ingredient<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">invalid</span><span class="Comment">*/</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L57" class="LineNr"> 57 </span>    <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment"><a href='043space.cc.html#L101'>address</a></span><span class="Comment">*/</span>ingredient<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L58" class="LineNr"> 58 </span>  <span class="Delimiter">}</span>
<span id="L59" class="LineNr"> 59 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L60" class="LineNr"> 60 </span><span class="Delimiter">}</span>
<span id="L61" class="LineNr"> 61 </span>
<span id="L62" class="LineNr"> 62 </span><span class="Delimiter">:(code)</span>
<span id="L63" class="LineNr"> 63 </span><span class="Normal">void</span> <a href='036abandon.cc.html#L63'>abandon</a><span class="Delimiter">(</span><span class="Normal">int</span> <a href='043space.cc.html#L101'>address</a><span class="Delimiter">,</span> <span class="Normal">int</span> <a href='036abandon.cc.html#L75'>payload_size</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L64" class="LineNr"> 64 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L101'>address</a><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">invalid alloc-id</span><span class="Comment">*/</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L65" class="LineNr"> 65 </span><span class="CommentedCode">//?   cerr &lt;&lt; &quot;abandon: &quot; &lt;&lt; address &lt;&lt; '\n';</span>
<span id="L66" class="LineNr"> 66 </span>  <span class="Comment">// clear rest of payload</span>
<span id="L67" class="LineNr"> 67 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = address+<span class="Constant">1</span><span class="Delimiter">;</span>  curr &lt; address+payload_size<span class="Delimiter">;</span>  ++curr<span class="Delimiter">)</span>
<span id="L68" class="LineNr"> 68 </span>    <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L69" class="LineNr"> 69 </span>  <span class="Comment">// append existing free list to address</span>
<span id="L70" class="LineNr"> 70 </span>  <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">&quot;abandon&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;saving &quot;</span> &lt;&lt; <a href='043space.cc.html#L101'>address</a> &lt;&lt; <span class="Constant">&quot; in free-list of size &quot;</span> &lt;&lt; <a href='036abandon.cc.html#L75'>payload_size</a> &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L71" class="LineNr"> 71 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+<span class="Comment">/*</span><span class="Comment">skip invalid alloc-id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> <a href='036abandon.cc.html#L75'>payload_size</a><span class="Delimiter">));</span>
<span id="L72" class="LineNr"> 72 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> <a href='036abandon.cc.html#L75'>payload_size</a><span class="Delimiter">,</span> <a href='043space.cc.html#L101'>address</a><span class="Delimiter">);</span>
<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">}</span>
<span id="L74" class="LineNr"> 74 </span>
<span id="L75" class="LineNr"> 75 </span><span class="Normal">int</span> <a href='036abandon.cc.html#L75'>payload_size</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L76" class="LineNr"> 76 </span>  x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
<span id="L77" class="LineNr"> 77 </span>  <a href='035lookup.cc.html#L88'>lookup_memory_core</a><span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">check_for_null</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
<span id="L78" class="LineNr"> 78 </span>  <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">alloc id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L79" class="LineNr"> 79 </span><span class="Delimiter">}</span>
<span id="L80" class="LineNr"> 80 </span>
<span id="L81" class="LineNr"> 81 </span><span class="Delimiter">:(after &quot;Allocate Special-cases&quot;)</span>
<span id="L82" class="LineNr"> 82 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L83" class="LineNr"> 83 </span>  <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">&quot;abandon&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;picking up space from free-list of size &quot;</span> &lt;&lt; size &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L84" class="LineNr"> 84 </span>  <span class="Normal">int</span> result = <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L85" class="LineNr"> 85 </span>  <a href='003trace.cc.html#L189'>trace</a><span class="Delimiter">(</span><span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new alloc from free list: &quot;</span> &lt;&lt; result &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L86" class="LineNr"> 86 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">,</span> <a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Comment">/*</span><span class="Comment">skip alloc id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">));</span>
<span id="L87" class="LineNr"> 87 </span>  <span class="Comment">// clear 'deleted' tag</span>
<span id="L88" class="LineNr"> 88 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L89" class="LineNr"> 89 </span>  <span class="Comment">// clear next pointer</span>
<span id="L90" class="LineNr"> 90 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Comment">/*</span><span class="Comment">skip alloc id</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L91" class="LineNr"> 91 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = result<span class="Delimiter">;</span>  curr &lt; result+size<span class="Delimiter">;</span>  ++curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L229'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L93" class="LineNr"> 93 </span>      <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span><a href='026call.cc.html#L87'>current_recipe_name</a><span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;memory in free list was not zeroed out: &quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">'/'</span> &lt;&lt; result &lt;&lt; <span class="Constant">&quot;; somebody wrote to us after free!!!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L225'>end</a><span class="Delimiter">();</span>
<span id="L94" class="LineNr"> 94 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// always fatal</span>
<span id="L95" class="LineNr"> 95 </span>    <span class="Delimiter">}</span>
<span id="L96" class="LineNr"> 96 </span>  <span class="Delimiter">}</span>
<span id="L97" class="LineNr"> 97 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span>
<span id="L100" class="LineNr">100 </span><span class="Delimiter">:(scenario new_differing_size_no_reclaim)</span>
<span id="L101" class="LineNr">101 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L102" class="LineNr">102 </span>  <span class="Constant">1</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
<span id="L103" class="LineNr">103 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>deaddress <span class="Constant">1</span>:&amp;:num
<span id="L104" class="LineNr">104 </span>  <a href='036abandon.cc.html#L63'>abandon</a> <span class="Constant">1</span>:&amp;:num
<span id="L105" class="LineNr">105 </span>  <span class="Constant">3</span>:&amp;:@:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">2</span>  <span class="Comment"># different size</span>
<span id="L106" class="LineNr">106 </span>  <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>deaddress <span class="Constant">3</span>:&amp;:@:num
<span id="L107" class="LineNr">107 </span>  <span class="Constant">5</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">4</span>:num
<span id="L108" class="LineNr">108 </span>]
<span id="L109" class="LineNr">109 </span><span class="Comment"># no reuse</span>
<span id="L110" class="LineNr">110 </span><span class="traceContains">+mem: storing 0 in location 5</span>
<span id="L111" class="LineNr">111 </span>
<span id="L112" class="LineNr">112 </span><span class="Delimiter">:(scenario new_reclaim_array)</span>
<span id="L113" class="LineNr">113 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L114" class="LineNr">114 </span>  <span class="Constant">10</span>:&amp;:@:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">2</span>
<span id="L115" class="LineNr">115 </span>  <span class="Constant">20</span>:num<span class="Special"> &lt;- </span>deaddress <span class="Constant">10</span>:&amp;:@:num
<span id="L116" class="LineNr">116 </span>  <a href='036abandon.cc.html#L63'>abandon</a> <span class="Constant">10</span>:&amp;:@:num
<span id="L117" class="LineNr">117 </span>  <span class="Constant">30</span>:&amp;:@:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span><span class="Delimiter">,</span> <span class="Constant">2</span>  <span class="Comment"># same size</span>
<span id="L118" class="LineNr">118 </span>  <span class="Constant">40</span>:num<span class="Special"> &lt;- </span>deaddress <span class="Constant">30</span>:&amp;:@:num
<span id="L119" class="LineNr">119 </span>  <span class="Constant">50</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">20</span>:num<span class="Delimiter">,</span> <span class="Constant">40</span>:num
<span id="L120" class="LineNr">120 </span>]
<span id="L121" class="LineNr">121 </span><span class="Comment"># both calls to new returned identical addresses</span>
<span id="L122" class="LineNr">122 </span><span class="traceContains">+mem: storing 1 in location 50</span>
<span id="L123" class="LineNr">123 </span>
<span id="L124" class="LineNr">124 </span><span class="Delimiter">:(scenario lookup_of_abandoned_address_raises_error)</span>
<span id="L125" class="LineNr">125 </span><span class="Special">% Hide_errors = true;</span>
<span id="L126" class="LineNr">126 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L127" class="LineNr">127 </span>  <span class="Constant">1</span>:&amp;:num<span class="Special"> &lt;- </span><span class="Normal">new</span> <span class="Constant">num:type</span>
<span id="L128" class="LineNr">128 </span>  <span class="Constant">3</span>:&amp;:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:&amp;:num
<span id="L129" class="LineNr">129 </span>  <a href='036abandon.cc.html#L63'>abandon</a> <span class="Constant">1</span>:&amp;:num
<span id="L130" class="LineNr">130 </span>  <span class="Constant">5</span>:num/<span class="Special">raw &lt;- </span>copy *<span class="Constant">3</span>:&amp;:num
<span id="L131" class="LineNr">131 </span>]
<span id="L132" class="LineNr">132 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: <a href='043space.cc.html#L101'>address</a> is already abandoned in '5:num/raw &lt;- copy *3:&amp;:num'</span>
</pre>
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