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-rw-r--r--html/edit/005-sandbox.mu.html474
1 files changed, 237 insertions, 237 deletions
diff --git a/html/edit/005-sandbox.mu.html b/html/edit/005-sandbox.mu.html
index 735a45de..91e61166 100644
--- a/html/edit/005-sandbox.mu.html
+++ b/html/edit/005-sandbox.mu.html
@@ -45,11 +45,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def!</span> main [
   <span class="Constant">local-scope</span>
   open-console
-  initial-recipe:text<span class="Special"> &lt;- </span>restore <span class="Constant">[recipes.mu]</span>
-  initial-sandbox:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  initial-recipe:text <span class="Special">&lt;-</span> restore <span class="Constant">[recipes.mu]</span>
+  initial-sandbox:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
   hide-screen <span class="Constant">0/screen</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment <span class="Constant">0/screen</span>, initial-recipe, initial-sandbox
-  env<span class="Special"> &lt;- </span>restore-sandboxes env
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment <span class="Constant">0/screen</span>, initial-recipe, initial-sandbox
+  env <span class="Special">&lt;-</span> restore-sandboxes env
   render-all <span class="Constant">0/screen</span>, env, render
   event-loop <span class="Constant">0/screen</span>, <span class="Constant">0/console</span>, env
   <span class="Comment"># never gets here</span>
@@ -62,7 +62,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 ]
 
 <span class="muRecipe">after</span> <span class="Constant">&lt;programming-environment-initialization&gt;</span> [
-  *result<span class="Special"> &lt;- </span>put *result, <span class="Constant">render-from:offset</span>, <span class="Constant">-1</span>
+  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">render-from:offset</span>,<span class="Constant"> -1</span>
 ]
 
 <span class="muData">container</span> sandbox [
@@ -82,7 +82,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
   <span class="Comment"># recipe editor is empty</span>
   <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[divide-with-remainder 11, 3]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[divide-with-remainder 11, 3]</span>
   <span class="Comment"># run the code in the editors</span>
   assume-console [
     press F4
@@ -133,7 +133,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   <span class="Comment"># run another command</span>
   assume-console [
-    left-click <span class="Constant">1</span>, <span class="Constant">80</span>
+    left-click<span class="Constant"> 1</span>,<span class="Constant"> 80</span>
     type <span class="Constant">[add 2, 2]</span>
     press F4
   ]
@@ -161,17 +161,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">after</span> <span class="Constant">&lt;global-keypress&gt;</span> [
   <span class="Comment"># F4? load all code and run all sandboxes.</span>
   <span class="Delimiter">{</span>
-    do-run?:bool<span class="Special"> &lt;- </span>equal k, <span class="Constant">65532/F4</span>
+    do-run?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65532/F4</span>
     <span class="muControl">break-unless</span> do-run?
-    screen<span class="Special"> &lt;- </span>update-status screen, <span class="Constant">[running...       ]</span>, <span class="Constant">245/grey</span>
-    error?:bool, env, screen<span class="Special"> &lt;- </span>run-sandboxes env, screen
+    screen <span class="Special">&lt;-</span> update-status screen, <span class="Constant">[running...       ]</span>, <span class="Constant">245/grey</span>
+    error?:bool, env, screen <span class="Special">&lt;-</span> run-sandboxes env, screen
     <span class="Comment"># F4 might update warnings and results on both sides</span>
-    screen<span class="Special"> &lt;- </span>render-all screen, env, render
+    screen <span class="Special">&lt;-</span> render-all screen, env, render
     <span class="Delimiter">{</span>
       <span class="muControl">break-if</span> error?
-      screen<span class="Special"> &lt;- </span>update-status screen, <span class="Constant">[                 ]</span>, <span class="Constant">245/grey</span>
+      screen <span class="Special">&lt;-</span> update-status screen, <span class="Constant">[                 ]</span>, <span class="Constant">245/grey</span>
     <span class="Delimiter">}</span>
-    screen<span class="Special"> &lt;- </span>update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
+    screen <span class="Special">&lt;-</span> update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
     <span class="muControl">loop</span> <span class="Constant">+next-event</span>
   <span class="Delimiter">}</span>
 ]
@@ -179,41 +179,41 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> run-sandboxes env:&amp;:environment, screen:&amp;:screen<span class="muRecipe"> -&gt; </span>errors-found?:bool, env:&amp;:environment, screen:&amp;:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  errors-found?:bool, env, screen<span class="Special"> &lt;- </span>update-recipes env, screen
+  errors-found?:bool, env, screen <span class="Special">&lt;-</span> update-recipes env, screen
   <span class="muControl">return-if</span> errors-found?
   <span class="Comment"># check contents of right editor (sandbox)</span>
 <span class="Constant">  &lt;run-sandboxes-begin&gt;</span>
-  current-sandbox:&amp;:editor<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
+  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
   <span class="Delimiter">{</span>
-    sandbox-contents:text<span class="Special"> &lt;- </span>editor-contents current-sandbox
+    sandbox-contents:text <span class="Special">&lt;-</span> editor-contents current-sandbox
     <span class="muControl">break-unless</span> sandbox-contents
     <span class="Comment"># if contents exist, first save them</span>
     <span class="Comment"># run them and turn them into a new sandbox</span>
-    new-sandbox:&amp;:sandbox<span class="Special"> &lt;- </span>new <span class="Constant">sandbox:type</span>
-    *new-sandbox<span class="Special"> &lt;- </span>put *new-sandbox, <span class="Constant">data:offset</span>, sandbox-contents
+    new-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
+    *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">data:offset</span>, sandbox-contents
     <span class="Comment"># push to head of sandbox list</span>
-    dest:&amp;:sandbox<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
-    *new-sandbox<span class="Special"> &lt;- </span>put *new-sandbox, <span class="Constant">next-sandbox:offset</span>, dest
-    *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">sandbox:offset</span>, new-sandbox
+    dest:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+    *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">next-sandbox:offset</span>, dest
+    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, new-sandbox
     <span class="Comment"># update sandbox count</span>
-    sandbox-count:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">number-of-sandboxes:offset</span>
-    sandbox-count<span class="Special"> &lt;- </span>add sandbox-count, <span class="Constant">1</span>
-    *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">number-of-sandboxes:offset</span>, sandbox-count
+    sandbox-count:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
+    sandbox-count <span class="Special">&lt;-</span> add sandbox-count,<span class="Constant"> 1</span>
+    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, sandbox-count
     <span class="Comment"># clear sandbox editor</span>
-    init:&amp;:duplex-list:char<span class="Special"> &lt;- </span>push <span class="Constant">167/§</span>, <span class="Constant">0/tail</span>
-    *current-sandbox<span class="Special"> &lt;- </span>put *current-sandbox, <span class="Constant">data:offset</span>, init
-    *current-sandbox<span class="Special"> &lt;- </span>put *current-sandbox, <span class="Constant">top-of-screen:offset</span>, init
+    init:&amp;:duplex-list:char <span class="Special">&lt;-</span> push <span class="Constant">167/§</span>, <span class="Constant">0/tail</span>
+    *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">data:offset</span>, init
+    *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">top-of-screen:offset</span>, init
   <span class="Delimiter">}</span>
   <span class="Comment"># save all sandboxes before running, just in case we die when running</span>
   save-sandboxes env
   <span class="Comment"># run all sandboxes</span>
-  curr:&amp;:sandbox<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
-  idx:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> curr
-    curr<span class="Special"> &lt;- </span>update-sandbox curr, env, idx
-    curr<span class="Special"> &lt;- </span>get *curr, <span class="Constant">next-sandbox:offset</span>
-    idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
+    curr <span class="Special">&lt;-</span> update-sandbox curr, env, idx
+    curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
+    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
 <span class="Constant">  &lt;run-sandboxes-end&gt;</span>
@@ -224,46 +224,46 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> update-recipes env:&amp;:environment, screen:&amp;:screen<span class="muRecipe"> -&gt; </span>errors-found?:bool, env:&amp;:environment, screen:&amp;:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  recipes:&amp;:editor<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipes:offset</span>
-  in:text<span class="Special"> &lt;- </span>editor-contents recipes
+  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+  in:text <span class="Special">&lt;-</span> editor-contents recipes
   save <span class="Constant">[recipes.mu]</span>, in  <span class="Comment"># newlayer: persistence</span>
   reload in
-  errors-found?<span class="Special"> &lt;- </span>copy <span class="Constant">0/false</span>
+  errors-found? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
 ]
 
 <span class="Comment"># replaced in a later layer</span>
 <span class="muRecipe">def!</span> update-sandbox sandbox:&amp;:sandbox, env:&amp;:environment, idx:num<span class="muRecipe"> -&gt; </span>sandbox:&amp;:sandbox, env:&amp;:environment [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  data:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
-  response:text, _, fake-screen:&amp;:screen<span class="Special"> &lt;- </span>run-sandboxed data
-  *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">response:offset</span>, response
-  *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
+  data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
+  response:text, _, fake-screen:&amp;:screen <span class="Special">&lt;-</span> run-sandboxed data
+  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response:offset</span>, response
+  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
 ]
 
 <span class="muRecipe">def</span> update-status screen:&amp;:screen, msg:text, color:num<span class="muRecipe"> -&gt; </span>screen:&amp;:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  screen<span class="Special"> &lt;- </span>move-cursor screen, <span class="Constant">0</span>, <span class="Constant">2</span>
-  screen<span class="Special"> &lt;- </span>print screen, msg, color, <span class="Constant">238/grey/background</span>
+  screen <span class="Special">&lt;-</span> move-cursor screen,<span class="Constant"> 0</span>,<span class="Constant"> 2</span>
+  screen <span class="Special">&lt;-</span> print screen, msg, color, <span class="Constant">238/grey/background</span>
 ]
 
 <span class="muRecipe">def</span> save-sandboxes env:&amp;:environment [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  current-sandbox:&amp;:editor<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
+  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
   <span class="Comment"># first clear previous versions, in case we deleted some sandbox</span>
-  $system <span class="Constant">[rm lesson/[0-9]</span>* <span class="Constant">&gt;/dev/null</span> <span class="Constant">2</span>&gt;/dev/null]  <span class="Comment"># some shells can't handle '&gt;&amp;'</span>
-  curr:&amp;:sandbox<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
-  idx:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+  $system <span class="Constant">[rm lesson/[0-9]</span>* <span class="Constant">&gt;/dev/null</span> 2&gt;/dev/null]  <span class="Comment"># some shells can't handle '&gt;&amp;'</span>
+  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> curr
-    data:text<span class="Special"> &lt;- </span>get *curr, <span class="Constant">data:offset</span>
-    filename:text<span class="Special"> &lt;- </span>to-text idx
+    data:text <span class="Special">&lt;-</span> get *curr, <span class="Constant">data:offset</span>
+    filename:text <span class="Special">&lt;-</span> to-text idx
     save filename, data
 <span class="Constant">    &lt;end-save-sandbox&gt;</span>
-    idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
-    curr<span class="Special"> &lt;- </span>get *curr, <span class="Constant">next-sandbox:offset</span>
+    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+    curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
 ]
@@ -271,24 +271,24 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def!</span> render-sandbox-side screen:&amp;:screen, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span>screen:&amp;:screen, env:&amp;:environment [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  trace <span class="Constant">11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render sandbox side]</span>
-  current-sandbox:&amp;:editor<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
-  row:num, column:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>, <span class="Constant">0</span>
-  left:num<span class="Special"> &lt;- </span>get *current-sandbox, <span class="Constant">left:offset</span>
-  right:num<span class="Special"> &lt;- </span>get *current-sandbox, <span class="Constant">right:offset</span>
+  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render sandbox side]</span>
+  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+  row:num, column:num <span class="Special">&lt;-</span> copy<span class="Constant"> 1</span>,<span class="Constant"> 0</span>
+  left:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+  right:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">right:offset</span>
   <span class="Comment"># render sandbox editor</span>
-  render-from:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">render-from:offset</span>
+  render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
   <span class="Delimiter">{</span>
-    render-current-sandbox?:bool<span class="Special"> &lt;- </span>equal render-from, <span class="Constant">-1</span>
+    render-current-sandbox?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
     <span class="muControl">break-unless</span> render-current-sandbox?
-    row, column, screen, current-sandbox<span class="Special"> &lt;- </span>call render-editor, screen, current-sandbox
+    row, column, screen, current-sandbox <span class="Special">&lt;-</span> call render-editor, screen, current-sandbox
     clear-screen-from screen, row, column, left, right
-    row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
+    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
   <span class="Delimiter">}</span>
   <span class="Comment"># render sandboxes</span>
   draw-horizontal screen, row, left, right
-  sandbox:&amp;:sandbox<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
-  row, screen<span class="Special"> &lt;- </span>render-sandboxes screen, sandbox, left, right, row, render-from
+  sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+  row, screen <span class="Special">&lt;-</span> render-sandboxes screen, sandbox, left, right, row, render-from
   clear-rest-of-screen screen, row, left, right
 ]
 
@@ -296,40 +296,40 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="muControl">return-unless</span> sandbox
-  screen-height:num<span class="Special"> &lt;- </span>screen-height screen
-  at-bottom?:bool<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
+  screen-height:num <span class="Special">&lt;-</span> screen-height screen
+  at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, screen-height
   <span class="muControl">return-if</span> at-bottom?:bool
-  hidden?:bool<span class="Special"> &lt;- </span>lesser-than idx, render-from
+  hidden?:bool <span class="Special">&lt;-</span> lesser-than idx, render-from
   <span class="Delimiter">{</span>
     <span class="muControl">break-if</span> hidden?
     <span class="Comment"># render sandbox menu</span>
-    row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
-    screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
-    screen<span class="Special"> &lt;- </span>render-sandbox-menu screen, idx, left, right
+    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+    screen <span class="Special">&lt;-</span> move-cursor screen, row, left
+    screen <span class="Special">&lt;-</span> render-sandbox-menu screen, idx, left, right
     <span class="Comment"># save menu row so we can detect clicks to it later</span>
-    *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>, row
+    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>, row
     <span class="Comment"># render sandbox contents</span>
-    row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
-    screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
-    sandbox-data:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
-    row, screen<span class="Special"> &lt;- </span>render-code screen, sandbox-data, left, right, row
-    *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, row
+    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+    screen <span class="Special">&lt;-</span> move-cursor screen, row, left
+    sandbox-data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
+    row, screen <span class="Special">&lt;-</span> render-code screen, sandbox-data, left, right, row
+    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, row
     <span class="Comment"># render sandbox warnings, screen or response, in that order</span>
-    sandbox-response:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">response:offset</span>
+    sandbox-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response:offset</span>
 <span class="Constant">    &lt;render-sandbox-results&gt;</span>
     <span class="Delimiter">{</span>
-      sandbox-screen:&amp;:screen<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">screen:offset</span>
-      empty-screen?:bool<span class="Special"> &lt;- </span>fake-screen-is-empty? sandbox-screen
+      sandbox-screen:&amp;:screen <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">screen:offset</span>
+      empty-screen?:bool <span class="Special">&lt;-</span> fake-screen-is-empty? sandbox-screen
       <span class="muControl">break-if</span> empty-screen?
-      row, screen<span class="Special"> &lt;- </span>render-screen screen, sandbox-screen, left, right, row
+      row, screen <span class="Special">&lt;-</span> render-screen screen, sandbox-screen, left, right, row
     <span class="Delimiter">}</span>
     <span class="Delimiter">{</span>
       <span class="muControl">break-unless</span> empty-screen?
 <span class="Constant">      &lt;render-sandbox-response&gt;</span>
-      row, screen<span class="Special"> &lt;- </span>render-text screen, sandbox-response, left, right, <span class="Constant">245/grey</span>, row
+      row, screen <span class="Special">&lt;-</span> render-text screen, sandbox-response, left, right, <span class="Constant">245/grey</span>, row
     <span class="Delimiter">}</span>
 <span class="Constant">    +render-sandbox-end</span>
-    at-bottom?:bool<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
+    at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, screen-height
     <span class="muControl">return-if</span> at-bottom?
     <span class="Comment"># draw solid line after sandbox</span>
     draw-horizontal screen, row, left, right
@@ -337,33 +337,33 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Comment"># if hidden, reset row attributes</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> hidden?
-    *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>, <span class="Constant">0</span>
-    *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, <span class="Constant">0</span>
+    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>,<span class="Constant"> 0</span>
+    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>,<span class="Constant"> 0</span>
 <span class="Constant">    &lt;end-render-sandbox-reset-hidden&gt;</span>
   <span class="Delimiter">}</span>
   <span class="Comment"># draw next sandbox</span>
-  next-sandbox:&amp;:sandbox<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">next-sandbox:offset</span>
-  next-idx:num<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
-  row, screen<span class="Special"> &lt;- </span>render-sandboxes screen, next-sandbox, left, right, row, render-from, next-idx
+  next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
+  next-idx:num <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+  row, screen <span class="Special">&lt;-</span> render-sandboxes screen, next-sandbox, left, right, row, render-from, next-idx
 ]
 
 <span class="muRecipe">def</span> render-sandbox-menu screen:&amp;:screen, sandbox-index:num, left:num, right:num<span class="muRecipe"> -&gt; </span>screen:&amp;:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   move-cursor-to-column screen, left
-  edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, delete-button-left:num<span class="Special"> &lt;- </span>sandbox-menu-columns left, right
+  edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, delete-button-left:num <span class="Special">&lt;-</span> sandbox-menu-columns left, right
   print screen, sandbox-index, <span class="Constant">232/dark-grey</span>, <span class="Constant">245/grey</span>
-  start-buttons:num<span class="Special"> &lt;- </span>subtract edit-button-left, <span class="Constant">1</span>
+  start-buttons:num <span class="Special">&lt;-</span> subtract edit-button-left,<span class="Constant"> 1</span>
   clear-line-until screen, start-buttons, <span class="Constant">245/grey</span>
   print screen, <span class="Constant">[edit]</span>, <span class="Constant">232/black</span>, <span class="Constant">94/background-orange</span>
   clear-line-until screen, edit-button-right, <span class="Constant">94/background-orange</span>
-  _, col:num<span class="Special"> &lt;- </span>cursor-position screen
-  at-start-of-copy-button?:bool<span class="Special"> &lt;- </span>equal col, copy-button-left
+  _, col:num <span class="Special">&lt;-</span> cursor-position screen
+  at-start-of-copy-button?:bool <span class="Special">&lt;-</span> equal col, copy-button-left
   assert at-start-of-copy-button?, <span class="Constant">[aaa]</span>
   print screen, <span class="Constant">[copy]</span>, <span class="Constant">232/black</span>, <span class="Constant">58/background-green</span>
   clear-line-until screen, copy-button-right, <span class="Constant">58/background-green</span>
-  _, col:num<span class="Special"> &lt;- </span>cursor-position screen
-  at-start-of-delete-button?:bool<span class="Special"> &lt;- </span>equal col, delete-button-left
+  _, col:num <span class="Special">&lt;-</span> cursor-position screen
+  at-start-of-delete-button?:bool <span class="Special">&lt;-</span> equal col, delete-button-left
   assert at-start-of-delete-button?, <span class="Constant">[bbb]</span>
   print screen, <span class="Constant">[delete]</span>, <span class="Constant">232/black</span>, <span class="Constant">52/background-red</span>
   clear-line-until screen, right, <span class="Constant">52/background-red</span>
@@ -375,16 +375,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> sandbox-menu-columns left:num, right:num<span class="muRecipe"> -&gt; </span>edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, delete-button-left:num [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  start-buttons:num<span class="Special"> &lt;- </span>add left, <span class="Constant">4/space-for-sandbox-index</span>
-  buttons-space:num<span class="Special"> &lt;- </span>subtract right, start-buttons
-  button-width:num<span class="Special"> &lt;- </span>divide-with-remainder buttons-space, <span class="Constant">3</span>  <span class="Comment"># integer division</span>
-  buttons-wide-enough?:bool<span class="Special"> &lt;- </span>greater-or-equal button-width, <span class="Constant">8</span>
+  start-buttons:num <span class="Special">&lt;-</span> add left, <span class="Constant">4/space-for-sandbox-index</span>
+  buttons-space:num <span class="Special">&lt;-</span> subtract right, start-buttons
+  button-width:num <span class="Special">&lt;-</span> divide-with-remainder buttons-space,<span class="Constant"> 3</span>  <span class="Comment"># integer division</span>
+  buttons-wide-enough?:bool <span class="Special">&lt;-</span> greater-or-equal button-width,<span class="Constant"> 8</span>
   assert buttons-wide-enough?, <span class="Constant">[sandbox must be at least 30 or so characters wide]</span>
-  edit-button-left:num<span class="Special"> &lt;- </span>copy start-buttons
-  copy-button-left:num<span class="Special"> &lt;- </span>add start-buttons, button-width
-  edit-button-right:num<span class="Special"> &lt;- </span>subtract copy-button-left, <span class="Constant">1</span>
-  delete-button-left:num<span class="Special"> &lt;- </span>subtract right, button-width
-  copy-button-right:num<span class="Special"> &lt;- </span>subtract delete-button-left, <span class="Constant">1</span>
+  edit-button-left:num <span class="Special">&lt;-</span> copy start-buttons
+  copy-button-left:num <span class="Special">&lt;-</span> add start-buttons, button-width
+  edit-button-right:num <span class="Special">&lt;-</span> subtract copy-button-left,<span class="Constant"> 1</span>
+  delete-button-left:num <span class="Special">&lt;-</span> subtract right, button-width
+  copy-button-right:num <span class="Special">&lt;-</span> subtract delete-button-left,<span class="Constant"> 1</span>
 ]
 
 <span class="Comment"># print a text 's' to 'editor' in 'color' starting at 'row'</span>
@@ -393,58 +393,58 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="muControl">return-unless</span> s
-  column:num<span class="Special"> &lt;- </span>copy left
-  screen<span class="Special"> &lt;- </span>move-cursor screen, row, column
-  screen-height:num<span class="Special"> &lt;- </span>screen-height screen
-  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-  len:num<span class="Special"> &lt;- </span>length *s
+  column:num <span class="Special">&lt;-</span> copy left
+  screen <span class="Special">&lt;-</span> move-cursor screen, row, column
+  screen-height:num <span class="Special">&lt;-</span> screen-height screen
+  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+  len:num <span class="Special">&lt;-</span> length *s
   <span class="Delimiter">{</span>
 <span class="Constant">    +next-character</span>
-    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, len
+    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
     <span class="muControl">break-if</span> done?
-    done?<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
+    done? <span class="Special">&lt;-</span> greater-or-equal row, screen-height
     <span class="muControl">break-if</span> done?
-    c:char<span class="Special"> &lt;- </span>index *s, i
+    c:char <span class="Special">&lt;-</span> index *s, i
     <span class="Delimiter">{</span>
       <span class="Comment"># at right? wrap.</span>
-      at-right?:bool<span class="Special"> &lt;- </span>equal column, right
+      at-right?:bool <span class="Special">&lt;-</span> equal column, right
       <span class="muControl">break-unless</span> at-right?
       <span class="Comment"># print wrap icon</span>
-      wrap-icon:char<span class="Special"> &lt;- </span>copy <span class="Constant">8617/loop-back-to-left</span>
+      wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
       print screen, wrap-icon, <span class="Constant">245/grey</span>
-      column<span class="Special"> &lt;- </span>copy left
-      row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
-      screen<span class="Special"> &lt;- </span>move-cursor screen, row, column
+      column <span class="Special">&lt;-</span> copy left
+      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+      screen <span class="Special">&lt;-</span> move-cursor screen, row, column
       <span class="muControl">loop</span> <span class="Constant">+next-character</span>  <span class="Comment"># retry i</span>
     <span class="Delimiter">}</span>
-    i<span class="Special"> &lt;- </span>add i, <span class="Constant">1</span>
+    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
     <span class="Delimiter">{</span>
       <span class="Comment"># newline? move to left rather than 0</span>
-      newline?:bool<span class="Special"> &lt;- </span>equal c, <span class="Constant">10/newline</span>
+      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
       <span class="muControl">break-unless</span> newline?
       <span class="Comment"># clear rest of line in this window</span>
       <span class="Delimiter">{</span>
-        done?:bool<span class="Special"> &lt;- </span>greater-than column, right
+        done?:bool <span class="Special">&lt;-</span> greater-than column, right
         <span class="muControl">break-if</span> done?
-        space:char<span class="Special"> &lt;- </span>copy <span class="Constant">32/space</span>
+        space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
         print screen, space
-        column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
+        column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
         <span class="muControl">loop</span>
       <span class="Delimiter">}</span>
-      row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
-      column<span class="Special"> &lt;- </span>copy left
-      screen<span class="Special"> &lt;- </span>move-cursor screen, row, column
+      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+      column <span class="Special">&lt;-</span> copy left
+      screen <span class="Special">&lt;-</span> move-cursor screen, row, column
       <span class="muControl">loop</span> <span class="Constant">+next-character</span>
     <span class="Delimiter">}</span>
     print screen, c, color
-    column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
+    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
-  was-at-left?:bool<span class="Special"> &lt;- </span>equal column, left
+  was-at-left?:bool <span class="Special">&lt;-</span> equal column, left
   clear-line-until screen, right
   <span class="Delimiter">{</span>
     <span class="muControl">break-if</span> was-at-left?
-    row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
+    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
   <span class="Delimiter">}</span>
   move-cursor screen, row, left
 ]
@@ -454,32 +454,32 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="Comment"># read all scenarios, pushing them to end of a list of scenarios</span>
-  idx:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-  curr:&amp;:sandbox<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-  prev:&amp;:sandbox<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+  curr:&amp;:sandbox <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+  prev:&amp;:sandbox <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
   <span class="Delimiter">{</span>
-    filename:text<span class="Special"> &lt;- </span>to-text idx
-    contents:text<span class="Special"> &lt;- </span>restore filename
+    filename:text <span class="Special">&lt;-</span> to-text idx
+    contents:text <span class="Special">&lt;-</span> restore filename
     <span class="muControl">break-unless</span> contents  <span class="Comment"># stop at first error; assuming file didn't exist</span>
                            <span class="Comment"># todo: handle empty sandbox</span>
     <span class="Comment"># create new sandbox for file</span>
-    curr<span class="Special"> &lt;- </span>new <span class="Constant">sandbox:type</span>
-    *curr<span class="Special"> &lt;- </span>put *curr, <span class="Constant">data:offset</span>, contents
+    curr <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
+    *curr <span class="Special">&lt;-</span> put *curr, <span class="Constant">data:offset</span>, contents
 <span class="Constant">    &lt;end-restore-sandbox&gt;</span>
     <span class="Delimiter">{</span>
       <span class="muControl">break-if</span> idx
-      *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">sandbox:offset</span>, curr
+      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, curr
     <span class="Delimiter">}</span>
     <span class="Delimiter">{</span>
       <span class="muControl">break-unless</span> idx
-      *prev<span class="Special"> &lt;- </span>put *prev, <span class="Constant">next-sandbox:offset</span>, curr
+      *prev <span class="Special">&lt;-</span> put *prev, <span class="Constant">next-sandbox:offset</span>, curr
     <span class="Delimiter">}</span>
-    idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
-    prev<span class="Special"> &lt;- </span>copy curr
+    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+    prev <span class="Special">&lt;-</span> copy curr
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
   <span class="Comment"># update sandbox count</span>
-  *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">number-of-sandboxes:offset</span>, idx
+  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, idx
 ]
 
 <span class="Comment"># print the fake sandbox screen to 'screen' with appropriate delimiters</span>
@@ -489,62 +489,62 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">load-ingredients</span>
   <span class="muControl">return-unless</span> sandbox-screen
   <span class="Comment"># print 'screen:'</span>
-  row<span class="Special"> &lt;- </span>render-text screen, <span class="Constant">[screen:]</span>, left, right, <span class="Constant">245/grey</span>, row
-  screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
+  row <span class="Special">&lt;-</span> render-text screen, <span class="Constant">[screen:]</span>, left, right, <span class="Constant">245/grey</span>, row
+  screen <span class="Special">&lt;-</span> move-cursor screen, row, left
   <span class="Comment"># start printing sandbox-screen</span>
-  column:num<span class="Special"> &lt;- </span>copy left
-  s-width:num<span class="Special"> &lt;- </span>screen-width sandbox-screen
-  s-height:num<span class="Special"> &lt;- </span>screen-height sandbox-screen
-  buf:&amp;:@:screen-cell<span class="Special"> &lt;- </span>get *sandbox-screen, <span class="Constant">data:offset</span>
-  stop-printing:num<span class="Special"> &lt;- </span>add left, s-width, <span class="Constant">3</span>
-  max-column:num<span class="Special"> &lt;- </span>min stop-printing, right
-  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-  len:num<span class="Special"> &lt;- </span>length *buf
-  screen-height:num<span class="Special"> &lt;- </span>screen-height screen
+  column:num <span class="Special">&lt;-</span> copy left
+  s-width:num <span class="Special">&lt;-</span> screen-width sandbox-screen
+  s-height:num <span class="Special">&lt;-</span> screen-height sandbox-screen
+  buf:&amp;:@:screen-cell <span class="Special">&lt;-</span> get *sandbox-screen, <span class="Constant">data:offset</span>
+  stop-printing:num <span class="Special">&lt;-</span> add left, s-width,<span class="Constant"> 3</span>
+  max-column:num <span class="Special">&lt;-</span> min stop-printing, right
+  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+  len:num <span class="Special">&lt;-</span> length *buf
+  screen-height:num <span class="Special">&lt;-</span> screen-height screen
   <span class="Delimiter">{</span>
-    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, len
+    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
     <span class="muControl">break-if</span> done?
-    done?<span class="Special"> &lt;- </span>greater-or-equal row, screen-height
+    done? <span class="Special">&lt;-</span> greater-or-equal row, screen-height
     <span class="muControl">break-if</span> done?
-    column<span class="Special"> &lt;- </span>copy left
-    screen<span class="Special"> &lt;- </span>move-cursor screen, row, column
+    column <span class="Special">&lt;-</span> copy left
+    screen <span class="Special">&lt;-</span> move-cursor screen, row, column
     <span class="Comment"># initial leader for each row: two spaces and a '.'</span>
-    space:char<span class="Special"> &lt;- </span>copy <span class="Constant">32/space</span>
+    space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
     print screen, space, <span class="Constant">245/grey</span>
     print screen, space, <span class="Constant">245/grey</span>
-    full-stop:char<span class="Special"> &lt;- </span>copy <span class="Constant">46/period</span>
+    full-stop:char <span class="Special">&lt;-</span> copy <span class="Constant">46/period</span>
     print screen, full-stop, <span class="Constant">245/grey</span>
-    column<span class="Special"> &lt;- </span>add left, <span class="Constant">3</span>
+    column <span class="Special">&lt;-</span> add left,<span class="Constant"> 3</span>
     <span class="Delimiter">{</span>
       <span class="Comment"># print row</span>
-      row-done?:bool<span class="Special"> &lt;- </span>greater-or-equal column, max-column
+      row-done?:bool <span class="Special">&lt;-</span> greater-or-equal column, max-column
       <span class="muControl">break-if</span> row-done?
-      curr:screen-cell<span class="Special"> &lt;- </span>index *buf, i
-      c:char<span class="Special"> &lt;- </span>get curr, <span class="Constant">contents:offset</span>
-      color:num<span class="Special"> &lt;- </span>get curr, <span class="Constant">color:offset</span>
+      curr:screen-cell <span class="Special">&lt;-</span> index *buf, i
+      c:char <span class="Special">&lt;-</span> get curr, <span class="Constant">contents:offset</span>
+      color:num <span class="Special">&lt;-</span> get curr, <span class="Constant">color:offset</span>
       <span class="Delimiter">{</span>
         <span class="Comment"># damp whites down to grey</span>
-        white?:bool<span class="Special"> &lt;- </span>equal color, <span class="Constant">7/white</span>
+        white?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">7/white</span>
         <span class="muControl">break-unless</span> white?
-        color<span class="Special"> &lt;- </span>copy <span class="Constant">245/grey</span>
+        color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
       <span class="Delimiter">}</span>
       print screen, c, color
-      column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
-      i<span class="Special"> &lt;- </span>add i, <span class="Constant">1</span>
+      column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+      i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
       <span class="muControl">loop</span>
     <span class="Delimiter">}</span>
     <span class="Comment"># print final '.'</span>
     print screen, full-stop, <span class="Constant">245/grey</span>
-    column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
+    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
     <span class="Delimiter">{</span>
       <span class="Comment"># clear rest of current line</span>
-      line-done?:bool<span class="Special"> &lt;- </span>greater-than column, right
+      line-done?:bool <span class="Special">&lt;-</span> greater-than column, right
       <span class="muControl">break-if</span> line-done?
       print screen, space
-      column<span class="Special"> &lt;- </span>add column, <span class="Constant">1</span>
+      column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
       <span class="muControl">loop</span>
     <span class="Delimiter">}</span>
-    row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
+    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
 ]
@@ -554,14 +554,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">12/height</span>
   <span class="Comment"># define a recipe (no indent for the 'add' line below so column numbers are more obvious)</span>
-  recipes:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  recipes:text <span class="Special">&lt;-</span> new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">local-scope</span>
 <span class="Constant">z:num &lt;- add 2, 2</span>
 <span class="Constant">reply z</span>
 <span class="Constant">]</span>]
   <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, recipes, <span class="Constant">[foo]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, recipes, <span class="Constant">[foo]</span>
   <span class="Comment"># run the code in the editors</span>
   assume-console [
     press F4
@@ -580,7 +580,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   <span class="Comment"># make a change (incrementing one of the args to 'add'), then rerun</span>
   assume-console [
-    left-click <span class="Constant">4</span>, <span class="Constant">28</span>  <span class="Comment"># one past the value of the second arg</span>
+    left-click<span class="Constant"> 4</span>,<span class="Constant"> 28</span>  <span class="Comment"># one past the value of the second arg</span>
     press backspace
     type <span class="Constant">[3]</span>
     press F4
@@ -608,7 +608,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
   <span class="Comment"># left editor is empty</span>
   <span class="Comment"># right editor contains an instruction</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[print-integer screen, 4]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[print-integer screen, 4]</span>
   <span class="Comment"># run the code in the editor</span>
   assume-console [
     press F4
@@ -637,37 +637,37 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> editor-contents editor:&amp;:editor<span class="muRecipe"> -&gt; </span>result:text [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  buf:&amp;:buffer<span class="Special"> &lt;- </span>new-buffer <span class="Constant">80</span>
-  curr:&amp;:duplex-list:char<span class="Special"> &lt;- </span>get *editor, <span class="Constant">data:offset</span>
+  buf:&amp;:buffer <span class="Special">&lt;-</span> new-buffer<span class="Constant"> 80</span>
+  curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
   <span class="Comment"># skip § sentinel</span>
   assert curr, <span class="Constant">[editor without data is illegal; must have at least a sentinel]</span>
-  curr<span class="Special"> &lt;- </span>next curr
-  <span class="muControl">return-unless</span> curr, <span class="Constant">0</span>
+  curr <span class="Special">&lt;-</span> next curr
+  <span class="muControl">return-unless</span> curr,<span class="Constant"> 0</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> curr
-    c:char<span class="Special"> &lt;- </span>get *curr, <span class="Constant">value:offset</span>
-    buf<span class="Special"> &lt;- </span>append buf, c
-    curr<span class="Special"> &lt;- </span>next curr
+    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+    buf <span class="Special">&lt;-</span> append buf, c
+    curr <span class="Special">&lt;-</span> next curr
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
-  result<span class="Special"> &lt;- </span>buffer-to-array buf
+  result <span class="Special">&lt;-</span> buffer-to-array buf
 ]
 
 <span class="muScenario">scenario</span> editor-provides-edited-contents [
   <span class="Constant">local-scope</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  e:&amp;:editor<span class="Special"> &lt;- </span>new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  e:&amp;:editor <span class="Special">&lt;-</span> new-editor <span class="Constant">[abc]</span>, screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   assume-console [
-    left-click <span class="Constant">1</span>, <span class="Constant">2</span>
+    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
     type <span class="Constant">[def]</span>
   ]
   run [
     editor-event-loop screen, console, e
-    s:text<span class="Special"> &lt;- </span>editor-contents e
-    <span class="Constant">1</span>:@:char/<span class="Special">raw &lt;- </span>copy *s
+    s:text <span class="Special">&lt;-</span> editor-contents e
+    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s
   ]
   memory-should-contain [
-    <span class="Constant">1</span>:array:character<span class="Special"> &lt;- </span><span class="Constant">[abdefc]</span>
+    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abdefc]</span>
   ]
 ]
 
@@ -677,7 +677,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   trace-until <span class="Constant">100/app</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
   render-all screen, env, render
   assume-console [
     press enter
@@ -698,7 +698,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   trace-until <span class="Constant">100/app</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
   render-all screen, env, render
   assume-console [
     press enter
@@ -706,7 +706,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
     press down-arrow  <span class="Comment"># while cursor isn't at bottom</span>
   ]
   event-loop screen, console, env
-  cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
   print screen, cursor
   <span class="Comment"># cursor moves back to bottom</span>
   screen-should-contain [
@@ -726,28 +726,28 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 ]
 
 <span class="muRecipe">after</span> <span class="Constant">&lt;render-recipe-components-end&gt;</span> [
-  *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">recipe-bottom:offset</span>, row
+  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">recipe-bottom:offset</span>, row
 ]
 
 <span class="muRecipe">after</span> <span class="Constant">&lt;global-keypress&gt;</span> [
   <span class="Delimiter">{</span>
     <span class="muControl">break-if</span> sandbox-in-focus?
-    down-arrow?:bool<span class="Special"> &lt;- </span>equal k, <span class="Constant">65516/down-arrow</span>
+    down-arrow?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65516/down-arrow</span>
     <span class="muControl">break-unless</span> down-arrow?
-    recipe-editor:&amp;:editor<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipes:offset</span>
-    recipe-cursor-row:num<span class="Special"> &lt;- </span>get *recipe-editor, <span class="Constant">cursor-row:offset</span>
-    recipe-editor-bottom:num<span class="Special"> &lt;- </span>get *recipe-editor, <span class="Constant">bottom:offset</span>
-    at-bottom-of-editor?:bool<span class="Special"> &lt;- </span>greater-or-equal recipe-cursor-row, recipe-editor-bottom
+    recipe-editor:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+    recipe-cursor-row:num <span class="Special">&lt;-</span> get *recipe-editor, <span class="Constant">cursor-row:offset</span>
+    recipe-editor-bottom:num <span class="Special">&lt;-</span> get *recipe-editor, <span class="Constant">bottom:offset</span>
+    at-bottom-of-editor?:bool <span class="Special">&lt;-</span> greater-or-equal recipe-cursor-row, recipe-editor-bottom
     <span class="muControl">break-unless</span> at-bottom-of-editor?
-    more-to-scroll?:bool<span class="Special"> &lt;- </span>more-to-scroll? env, screen
+    more-to-scroll?:bool <span class="Special">&lt;-</span> more-to-scroll? env, screen
     <span class="muControl">break-if</span> more-to-scroll?
     <span class="muControl">loop</span> <span class="Constant">+next-event</span>
   <span class="Delimiter">}</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-if</span> sandbox-in-focus?
-    page-down?:bool<span class="Special"> &lt;- </span>equal k, <span class="Constant">65518/page-down</span>
+    page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
     <span class="muControl">break-unless</span> page-down?
-    more-to-scroll?:bool<span class="Special"> &lt;- </span>more-to-scroll? env, screen
+    more-to-scroll?:bool <span class="Special">&lt;-</span> more-to-scroll? env, screen
     <span class="muControl">break-if</span> more-to-scroll?
     <span class="muControl">loop</span> <span class="Constant">+next-event</span>
   <span class="Delimiter">}</span>
@@ -756,9 +756,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">after</span> <span class="Constant">&lt;global-type&gt;</span> [
   <span class="Delimiter">{</span>
     <span class="muControl">break-if</span> sandbox-in-focus?
-    page-down?:bool<span class="Special"> &lt;- </span>equal k, <span class="Constant">6/ctrl-f</span>
+    page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">6/ctrl-f</span>
     <span class="muControl">break-unless</span> page-down?
-    more-to-scroll?:bool<span class="Special"> &lt;- </span>more-to-scroll? env, screen
+    more-to-scroll?:bool <span class="Special">&lt;-</span> more-to-scroll? env, screen
     <span class="muControl">break-if</span> more-to-scroll?
     <span class="muControl">loop</span> <span class="Constant">+next-event</span>
   <span class="Delimiter">}</span>
@@ -767,16 +767,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> more-to-scroll? env:&amp;:environment, screen:&amp;:screen<span class="muRecipe"> -&gt; </span>result:bool [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  recipe-bottom:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipe-bottom:offset</span>
-  height:num<span class="Special"> &lt;- </span>screen-height screen
-  result<span class="Special"> &lt;- </span>greater-or-equal recipe-bottom, height
+  recipe-bottom:num <span class="Special">&lt;-</span> get *env, <span class="Constant">recipe-bottom:offset</span>
+  height:num <span class="Special">&lt;-</span> screen-height screen
+  result <span class="Special">&lt;-</span> greater-or-equal recipe-bottom, height
 ]
 
 <span class="muScenario">scenario</span> scrolling-down-past-bottom-of-recipe-editor-2 [
   <span class="Constant">local-scope</span>
   trace-until <span class="Constant">100/app</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
   render-all screen, env, render
   assume-console [
     <span class="Comment"># add a line</span>
@@ -801,7 +801,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   trace-until <span class="Constant">100/app</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[ab</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[ab</span>
 <span class="Constant">cd]</span>
   render-all screen, env, render
   assume-console [
@@ -813,7 +813,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
     press down-arrow
   ]
   event-loop screen, console, env
-  cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
   print screen, cursor
   <span class="Comment"># no scroll on recipe side, cursor moves on sandbox side</span>
   screen-should-contain [
@@ -832,7 +832,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize sandbox side</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[add 2, 2]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[add 2, 2]</span>
   render-all screen, env, render
   assume-console [
     <span class="Comment"># create a sandbox</span>
@@ -853,7 +853,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   run [
     event-loop screen, console, env
-    cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
     print screen, cursor
   ]
   <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
@@ -871,7 +871,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   run [
     event-loop screen, console, env
-    cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
     print screen, cursor
   ]
   <span class="Comment"># sandbox editor displays again, cursor is in editor</span>
@@ -888,22 +888,22 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">after</span> <span class="Constant">&lt;global-keypress&gt;</span> [
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> sandbox-in-focus?
-    page-down?:bool<span class="Special"> &lt;- </span>equal k, <span class="Constant">65518/page-down</span>
+    page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
     <span class="muControl">break-unless</span> page-down?
-    sandbox:&amp;:sandbox<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
+    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
     <span class="muControl">break-unless</span> sandbox
     <span class="Comment"># slide down if possible</span>
     <span class="Delimiter">{</span>
-      render-from:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">render-from:offset</span>
-      number-of-sandboxes:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">number-of-sandboxes:offset</span>
-      max:num<span class="Special"> &lt;- </span>subtract number-of-sandboxes, <span class="Constant">1</span>
-      at-end?:bool<span class="Special"> &lt;- </span>greater-or-equal render-from, max
+      render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+      number-of-sandboxes:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
+      max:num <span class="Special">&lt;-</span> subtract number-of-sandboxes,<span class="Constant"> 1</span>
+      at-end?:bool <span class="Special">&lt;-</span> greater-or-equal render-from, max
       <span class="muControl">jump-if</span> at-end?, <span class="Constant">+finish-event</span>  <span class="Comment"># render nothing</span>
-      render-from<span class="Special"> &lt;- </span>add render-from, <span class="Constant">1</span>
-      *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">render-from:offset</span>, render-from
+      render-from <span class="Special">&lt;-</span> add render-from,<span class="Constant"> 1</span>
+      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
     <span class="Delimiter">}</span>
     hide-screen screen
-    screen<span class="Special"> &lt;- </span>render-sandbox-side screen, env, render
+    screen <span class="Special">&lt;-</span> render-sandbox-side screen, env, render
     show-screen screen
     <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
   <span class="Delimiter">}</span>
@@ -913,11 +913,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">after</span> <span class="Constant">&lt;update-cursor-special-cases&gt;</span> [
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> sandbox-in-focus?
-    render-from:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">render-from:offset</span>
-    scrolling?:bool<span class="Special"> &lt;- </span>greater-or-equal render-from, <span class="Constant">0</span>
+    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+    scrolling?:bool <span class="Special">&lt;-</span> greater-or-equal render-from,<span class="Constant"> 0</span>
     <span class="muControl">break-unless</span> scrolling?
-    cursor-column:num<span class="Special"> &lt;- </span>get *current-sandbox, <span class="Constant">left:offset</span>
-    screen<span class="Special"> &lt;- </span>move-cursor screen, <span class="Constant">2/row</span>, cursor-column  <span class="Comment"># highlighted sandbox will always start at row 2</span>
+    cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+    screen <span class="Special">&lt;-</span> move-cursor screen, <span class="Constant">2/row</span>, cursor-column  <span class="Comment"># highlighted sandbox will always start at row 2</span>
     <span class="muControl">return</span>
   <span class="Delimiter">}</span>
 ]
@@ -926,15 +926,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">after</span> <span class="Constant">&lt;global-keypress&gt;</span> [
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> sandbox-in-focus?
-    page-up?:bool<span class="Special"> &lt;- </span>equal k, <span class="Constant">65519/page-up</span>
+    page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
     <span class="muControl">break-unless</span> page-up?
-    render-from:num<span class="Special"> &lt;- </span>get *env, <span class="Constant">render-from:offset</span>
-    at-beginning?:bool<span class="Special"> &lt;- </span>equal render-from, <span class="Constant">-1</span>
+    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+    at-beginning?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
     <span class="muControl">break-if</span> at-beginning?
-    render-from<span class="Special"> &lt;- </span>subtract render-from, <span class="Constant">1</span>
-    *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">render-from:offset</span>, render-from
+    render-from <span class="Special">&lt;-</span> subtract render-from,<span class="Constant"> 1</span>
+    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
     hide-screen screen
-    screen<span class="Special"> &lt;- </span>render-sandbox-side screen, env, render
+    screen <span class="Special">&lt;-</span> render-sandbox-side screen, env, render
     show-screen screen
     <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
   <span class="Delimiter">}</span>
@@ -945,15 +945,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> previous-sandbox env:&amp;:environment, in:&amp;:sandbox<span class="muRecipe"> -&gt; </span>out:&amp;:sandbox [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  curr:&amp;:sandbox<span class="Special"> &lt;- </span>get *env, <span class="Constant">sandbox:offset</span>
+  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
   <span class="muControl">return-unless</span> curr, <span class="Constant">0/nil</span>
-  next:&amp;:sandbox<span class="Special"> &lt;- </span>get *curr, <span class="Constant">next-sandbox:offset</span>
+  next:&amp;:sandbox <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
   <span class="Delimiter">{</span>
     <span class="muControl">return-unless</span> next, <span class="Constant">0/nil</span>
-    found?:bool<span class="Special"> &lt;- </span>equal next, in
+    found?:bool <span class="Special">&lt;-</span> equal next, in
     <span class="muControl">break-if</span> found?
-    curr<span class="Special"> &lt;- </span>copy next
-    next<span class="Special"> &lt;- </span>get *curr, <span class="Constant">next-sandbox:offset</span>
+    curr <span class="Special">&lt;-</span> copy next
+    next <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
     <span class="muControl">loop</span>
   <span class="Delimiter">}</span>
   <span class="muControl">return</span> curr
@@ -964,10 +964,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize sandbox side and create a sandbox</span>
-  recipes:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  recipes:text <span class="Special">&lt;-</span> new <span class="Constant">[ </span>
 <span class="Constant">]</span>
   <span class="Comment"># create a sandbox</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, recipes:text, <span class="Constant">[add 2, 2]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, recipes:text, <span class="Constant">[add 2, 2]</span>
   render-all screen, env, render
   assume-console [
     press F4
@@ -979,7 +979,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   run [
     event-loop screen, console, env
-    cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
     print screen, cursor
   ]
   <span class="Comment"># cursor moves down on recipe side</span>
@@ -997,7 +997,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
   render-all screen, env, render
   <span class="Comment"># create 2 sandboxes</span>
   assume-console [
@@ -1008,7 +1008,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
     press F4
   ]
   event-loop screen, console, env
-  cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
   print screen, cursor
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -1028,7 +1028,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   run [
     event-loop screen, console, env
-    cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
     print screen, cursor
   ]
   <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
@@ -1103,7 +1103,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   run [
     event-loop screen, console, env
-    cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
     print screen, cursor
   ]
   <span class="Comment"># back to displaying both sandboxes as well as editor</span>
@@ -1125,7 +1125,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
   run [
     event-loop screen, console, env
-    cursor:char<span class="Special"> &lt;- </span>copy <span class="Constant">9251/␣</span>
+    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
     print screen, cursor
   ]
   <span class="Comment"># no change</span>
@@ -1148,7 +1148,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  env:&amp;:environment<span class="Special"> &lt;- </span>new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
+  env:&amp;:environment <span class="Special">&lt;-</span> new-programming-environment screen, <span class="Constant">[]</span>, <span class="Constant">[]</span>
   render-all screen, env, render
   <span class="Comment"># create a sandbox</span>
   assume-console [