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RWRJc1FUaeVeqsGlEPc66dguintWWomCSORUNseged62IATuMVCK0zu6
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<pre id='vimCodeElement'>
<span class="muRecipe">def</span> random generator:&amp;:stream:num<span class="muRecipe"> -&gt; </span>result:num, fail?:bool, generator:&amp;:stream:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-if</span> generator
    <span class="Comment"># generator is 0? use real random-number generator</span>
    result<span class="Special"> &lt;- </span>real-random
    <span class="muControl">reply</span> result, <span class="Constant">0/false</span>
  <span class="Delimiter">}</span>
  result, fail?, generator<span class="Special"> &lt;- </span>read generator
]

<span class="Comment"># helper for tests</span>
<span class="muRecipe">def</span> assume-random-numbers<span class="muRecipe"> -&gt; </span>result:&amp;:stream:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Comment"># compute result-len, space to allocate in result</span>
  result-len:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    _, arg-received?:bool<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
    <span class="muControl">break-unless</span> arg-received?
    result-len<span class="Special"> &lt;- </span>add result-len, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  <span class="Constant">rewind-ingredients</span>
  result-data:&amp;:@:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>, result-len
  idx:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    curr:num, arg-received?:bool<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
    <span class="muControl">break-unless</span> arg-received?
    *result-data<span class="Special"> &lt;- </span>put-index *result-data, idx, curr
    idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  result<span class="Special"> &lt;- </span>new-stream result-data
]

<span class="muScenario">scenario</span> random-numbers-in-scenario [
  <span class="Constant">local-scope</span>
  source:&amp;:stream:num<span class="Special"> &lt;- </span>assume-random-numbers <span class="Constant">34</span>, <span class="Constant">35</span>, <span class="Constant">37</span>
  <span class="Constant">1</span>:num/<span class="Special">raw</span>, <span class="Constant">2</span>:bool/<span class="Special">raw &lt;- </span>random source
  <span class="Constant">3</span>:num/<span class="Special">raw</span>, <span class="Constant">4</span>:bool/<span class="Special">raw &lt;- </span>random source
  <span class="Constant">5</span>:num/<span class="Special">raw</span>, <span class="Constant">6</span>:bool/<span class="Special">raw &lt;- </span>random source
  <span class="Constant">7</span>:num/<span class="Special">raw</span>, <span class="Constant">8</span>:bool/<span class="Special">raw &lt;- </span>random source
  memory-should-contain [
    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">34</span>
    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># everything went well</span>
    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">35</span>
    <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># everything went well</span>
    <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">37</span>
    <span class="Constant">6</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># everything went well</span>
    <span class="Constant">7</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># empty result</span>
    <span class="Constant">8</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># end of stream</span>
  ]
]

<span class="muRecipe">def</span> random-in-range generator:&amp;:stream:num, start:num, end:num<span class="muRecipe"> -&gt; </span>result:num, fail?:bool, generator:&amp;:stream:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  result, fail?, generator<span class="Special"> &lt;- </span>random generator
  <span class="muControl">return-if</span> fail?
  delta:num<span class="Special"> &lt;- </span>subtract end, start
  _, result<span class="Special"> &lt;- </span>divide-with-remainder result, delta
  result<span class="Special"> &lt;- </span>add result, start
]

<span class="muScenario">scenario</span> random-in-range [
  <span class="Constant">local-scope</span>
  source:&amp;:stream:num<span class="Special"> &lt;- </span>assume-random-numbers <span class="Constant">91</span>
  <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>random-in-range source, <span class="Constant">40</span>, <span class="Constant">50</span>
  memory-should-contain [
    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">41</span>
  ]
]
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