From e4dc3273f201ae741637b626998637cce973546b Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 2 Oct 2026 13:04:34 -0700
Subject: First pass README updates

---
 chapter10a/docs/lattice.svg | 233 ++++++++++++++++++++++----------------------
 1 file changed, 116 insertions(+), 117 deletions(-)

(limited to 'chapter10a/docs/lattice.svg')

diff --git a/chapter10a/docs/lattice.svg b/chapter10a/docs/lattice.svg
index 24c0de8c..c8bed535 100644
--- a/chapter10a/docs/lattice.svg
+++ b/chapter10a/docs/lattice.svg
@@ -4,122 +4,122 @@
 <!-- Generated by graphviz version 12.2.0 (20241103.1931)
  -->
 <!-- Title: Lattice Pages: 1 -->
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 <title>Lattice</title>
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 <title>cluster_control</title>
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-<text text-anchor="middle" x="53" y="-459.39" font-family="Arial" font-size="14.00">Control</text>
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+<text text-anchor="middle" x="53" y="-437.41" font-family="Arial" font-size="14.00">Control</text>
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-<text text-anchor="middle" x="652.5" y="-470.38" font-family="Arial" font-size="14.00">Pointer = nullability × struct type</text>
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+<text text-anchor="middle" x="652.5" y="-448.4" font-family="Arial" font-size="14.00">Pointer = nullability × struct type</text>
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-<text text-anchor="middle" x="1294" y="-459.39" font-family="Arial" font-size="14.00">Memory</text>
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+<text text-anchor="middle" x="1294" y="-437.41" font-family="Arial" font-size="14.00">Memory</text>
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+<text text-anchor="middle" x="1493" y="-437.41" font-family="Arial" font-size="14.00">collection of types</text>
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 <title>TOP</title>
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-<text text-anchor="middle" x="845" y="-525.33" font-family="DejaVu Sans" font-size="13.00" fill="white">⊤</text>
+<ellipse fill="black" stroke="black" cx="875" cy="-507.45" rx="27" ry="18"/>
+<text text-anchor="middle" x="875" y="-503.35" font-family="DejaVu Sans" font-size="13.00" fill="white">⊤</text>
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 <title>XCTRL</title>
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-<text text-anchor="middle" x="53" y="-422.84" font-family="DejaVu Sans" font-size="13.00">⊤:ctrl</text>
+<ellipse fill="#ffff00" stroke="black" cx="53" cy="-404.96" rx="36.51" ry="18"/>
+<text text-anchor="middle" x="53" y="-400.86" font-family="DejaVu Sans" font-size="13.00">⊤:ctrl</text>
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 <title>TOP&#45;&gt;XCTRL</title>
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 <g id="node5" class="node">
 <title>INT_TOP</title>
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-<text text-anchor="middle" x="353" y="-422.84" font-family="DejaVu Sans" font-size="13.00">⊤:int</text>
+<ellipse fill="#add8e6" stroke="black" cx="353" cy="-404.96" rx="33.44" ry="18"/>
+<text text-anchor="middle" x="353" y="-400.86" font-family="DejaVu Sans" font-size="13.00">⊤:int</text>
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 <title>TOP&#45;&gt;INT_TOP</title>
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 <g id="node10" class="node">
 <title>PTR_TOP</title>
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-<text text-anchor="middle" x="685" y="-431.09" font-family="DejaVu Sans" font-size="13.00" fill="white">⊤:ptr</text>
-<text text-anchor="middle" x="685" y="-414.59" font-family="DejaVu Sans" font-size="13.00" fill="white">[*⊤:struct]</text>
+<ellipse fill="#008000" stroke="black" cx="715" cy="-404.96" rx="61.7" ry="28.99"/>
+<text text-anchor="middle" x="715" y="-409.11" font-family="DejaVu Sans" font-size="13.00" fill="white">⊤:ptr</text>
+<text text-anchor="middle" x="715" y="-392.61" font-family="DejaVu Sans" font-size="13.00" fill="white">[*⊤:struct]</text>
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 <title>TOP&#45;&gt;PTR_TOP</title>
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-<polygon fill="#555555" stroke="#555555" points="728.87,-453.01 722.67,-451.6 726.64,-456.57 728.87,-453.01"/>
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 <title>STRUCT_TOP</title>
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-<text text-anchor="middle" x="996" y="-431.09" font-family="DejaVu Sans" font-size="13.00">⊤:struct</text>
-<text text-anchor="middle" x="996" y="-414.59" font-family="DejaVu Sans" font-size="13.00">[struct top]</text>
+<ellipse fill="#90ee90" stroke="black" cx="996" cy="-404.96" rx="64.35" ry="28.99"/>
+<text text-anchor="middle" x="996" y="-409.11" font-family="DejaVu Sans" font-size="13.00">⊤:struct</text>
+<text text-anchor="middle" x="996" y="-392.61" font-family="DejaVu Sans" font-size="13.00">[struct top]</text>
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 <!-- TOP&#45;&gt;STRUCT_TOP -->
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 <title>TOP&#45;&gt;STRUCT_TOP</title>
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 <g id="node26" class="node">
 <title>MEM_TOP</title>
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-<text text-anchor="middle" x="1294" y="-422.84" font-family="DejaVu Sans" font-size="13.00" fill="white">⊤:mem</text>
+<ellipse fill="#00008b" stroke="black" cx="1294" cy="-404.96" rx="44.7" ry="18"/>
+<text text-anchor="middle" x="1294" y="-400.86" font-family="DejaVu Sans" font-size="13.00" fill="white">⊤:mem</text>
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 <title>TOP&#45;&gt;MEM_TOP</title>
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 <title>TUPLE_TOP</title>
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-<text text-anchor="middle" x="1408" y="-422.84" font-family="DejaVu Sans" font-size="13.00">⊤:tuple</text>
+<ellipse fill="#ffc0cb" stroke="black" cx="1408" cy="-404.96" rx="44.7" ry="18"/>
+<text text-anchor="middle" x="1408" y="-400.86" font-family="DejaVu Sans" font-size="13.00">⊤:tuple</text>
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 <!-- TOP&#45;&gt;TUPLE_TOP -->
 <g id="edge58" class="edge">
 <title>TOP&#45;&gt;TUPLE_TOP</title>
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+<polygon fill="#555555" stroke="#555555" points="1399.03,-430.62 1399.89,-424.32 1395.29,-428.7 1399.03,-430.62"/>
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 <g id="node2" class="node">
@@ -136,8 +136,8 @@
 <!-- XCTRL&#45;&gt;CTRL -->
 <g id="edge1" class="edge">
 <title>XCTRL&#45;&gt;CTRL</title>
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 <!-- XCTRL&#45;&gt;INT_TOP -->
 <!-- CTRL&#45;&gt;BOT -->
@@ -155,8 +155,8 @@
 <!-- INT_TOP&#45;&gt;INT_NEG -->
 <g id="edge4" class="edge">
 <title>INT_TOP&#45;&gt;INT_NEG</title>
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@@ -167,8 +167,8 @@
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 <g id="edge5" class="edge">
 <title>INT_TOP&#45;&gt;INT_ZERO</title>
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@@ -179,8 +179,8 @@
 <!-- INT_TOP&#45;&gt;INT_POS -->
 <g id="edge6" class="edge">
 <title>INT_TOP&#45;&gt;INT_POS</title>
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-<polygon fill="#555555" stroke="#555555" points="355.1,-242.96 353,-236.96 350.9,-242.96 355.1,-242.96"/>
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+<polygon fill="#555555" stroke="#555555" points="355.1,-242.8 353,-236.8 350.9,-242.8 355.1,-242.8"/>
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 <!-- INT_TOP&#45;&gt;PTR_TOP -->
 <!-- INT_BOT -->
@@ -218,51 +218,50 @@
 <!-- PTR_NULL -->
 <g id="node12" class="node">
 <title>PTR_NULL</title>
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-<text text-anchor="middle" x="808" y="-326.11" font-family="DejaVu Sans" font-size="13.00" fill="white">null</text>
-<text text-anchor="middle" x="808" y="-309.61" font-family="DejaVu Sans" font-size="13.00" fill="white">[*⊤:struct?]</text>
+<ellipse fill="#008000" stroke="black" cx="799" cy="-310.97" rx="27.3" ry="18"/>
+<text text-anchor="middle" x="799" y="-306.87" font-family="DejaVu Sans" font-size="13.00" fill="white">null</text>
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 <!-- PTR_TOP&#45;&gt;PTR_NULL -->
 <g id="edge16" class="edge">
 <title>PTR_TOP&#45;&gt;PTR_NULL</title>
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-<polygon fill="#555555" stroke="#555555" points="773.51,-354.57 776.76,-349.11 770.82,-351.35 773.51,-354.57"/>
+<path fill="none" stroke="#555555" d="M738.85,-377.84C752,-363.43 768.1,-345.8 780.33,-332.41"/>
+<polygon fill="#555555" stroke="#555555" points="781.8,-333.91 784.3,-328.06 778.7,-331.08 781.8,-333.91"/>
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 <g id="node14" class="node">
 <title>PTR_PERSON</title>
-<ellipse fill="#008000" stroke="black" cx="512" cy="-321.96" rx="45.72" ry="18"/>
-<text text-anchor="middle" x="512" y="-317.86" font-family="DejaVu Sans" font-size="13.00" fill="white">*Person</text>
+<ellipse fill="#008000" stroke="black" cx="542" cy="-310.97" rx="45.72" ry="18"/>
+<text text-anchor="middle" x="542" y="-306.87" font-family="DejaVu Sans" font-size="13.00" fill="white">*Person</text>
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 <!-- PTR_TOP&#45;&gt;PTR_PERSON -->
 <g id="edge17" class="edge">
 <title>PTR_TOP&#45;&gt;PTR_PERSON</title>
-<path fill="none" stroke="#555555" d="M647.46,-403.59C616.14,-384.95 572.05,-358.7 542.78,-341.28"/>
-<polygon fill="#555555" stroke="#555555" points="543.94,-339.52 537.71,-338.26 541.79,-343.13 543.94,-339.52"/>
+<path fill="none" stroke="#555555" d="M674.88,-382.62C644.57,-366.5 603.47,-344.65 575.04,-329.54"/>
+<polygon fill="#555555" stroke="#555555" points="576.08,-327.71 569.8,-326.75 574.11,-331.42 576.08,-327.71"/>
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 <!-- PTR_S1 -->
 <g id="node15" class="node">
 <title>PTR_S1</title>
-<ellipse fill="#008000" stroke="black" cx="601" cy="-321.96" rx="27" ry="18"/>
-<text text-anchor="middle" x="601" y="-317.86" font-family="DejaVu Sans" font-size="13.00" fill="white">*s1</text>
+<ellipse fill="#008000" stroke="black" cx="631" cy="-310.97" rx="27" ry="18"/>
+<text text-anchor="middle" x="631" y="-306.87" font-family="DejaVu Sans" font-size="13.00" fill="white">*s1</text>
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 <!-- PTR_TOP&#45;&gt;PTR_S1 -->
 <g id="edge18" class="edge">
 <title>PTR_TOP&#45;&gt;PTR_S1</title>
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-<polygon fill="#555555" stroke="#555555" points="619.81,-342.7 614.39,-339.38 616.56,-345.36 619.81,-342.7"/>
+<path fill="none" stroke="#555555" d="M691.15,-377.84C678,-363.43 661.9,-345.8 649.67,-332.41"/>
+<polygon fill="#555555" stroke="#555555" points="651.3,-331.08 645.7,-328.06 648.2,-333.91 651.3,-331.08"/>
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 <!-- PTR_MORE -->
 <g id="node16" class="node">
 <title>PTR_MORE</title>
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-<text text-anchor="middle" x="685" y="-317.86" font-family="DejaVu Sans" font-size="13.00" fill="white">*s2, …</text>
+<ellipse fill="#008000" stroke="black" cx="715" cy="-310.97" rx="40.6" ry="18"/>
+<text text-anchor="middle" x="715" y="-306.87" font-family="DejaVu Sans" font-size="13.00" fill="white">*s2, …</text>
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 <!-- PTR_TOP&#45;&gt;PTR_MORE -->
 <g id="edge19" class="edge">
 <title>PTR_TOP&#45;&gt;PTR_MORE</title>
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+<polygon fill="#555555" stroke="#555555" points="717.1,-336.91 715,-330.91 712.9,-336.91 717.1,-336.91"/>
 </g>
 <!-- PTR_TOP&#45;&gt;STRUCT_TOP -->
 <!-- PTR_BOT -->
@@ -287,8 +286,8 @@
 <!-- PTR_NULL&#45;&gt;PTR_PERSON_NIL -->
 <g id="edge26" class="edge">
 <title>PTR_NULL&#45;&gt;PTR_PERSON_NIL</title>
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-<polygon fill="#555555" stroke="#555555" points="681.63,-235.56 675.47,-234.02 679.33,-239.07 681.63,-235.56"/>
+<path fill="none" stroke="#555555" d="M779.65,-297.94C754.63,-282.39 710.79,-255.14 681.32,-236.82"/>
+<polygon fill="#555555" stroke="#555555" points="682.76,-235.24 676.55,-233.86 680.54,-238.81 682.76,-235.24"/>
 </g>
 <!-- PTR_S1_NIL -->
 <g id="node18" class="node">
@@ -299,8 +298,8 @@
 <!-- PTR_NULL&#45;&gt;PTR_S1_NIL -->
 <g id="edge27" class="edge">
 <title>PTR_NULL&#45;&gt;PTR_S1_NIL</title>
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-<polygon fill="#555555" stroke="#555555" points="763.16,-239.82 758.32,-235.69 759.53,-241.93 763.16,-239.82"/>
+<path fill="none" stroke="#555555" d="M789.88,-293.52C781.74,-278.83 769.73,-257.16 760.65,-240.8"/>
+<polygon fill="#555555" stroke="#555555" points="762.69,-240.14 757.94,-235.91 759.02,-242.18 762.69,-240.14"/>
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 <!-- PTR_MORE_NIL -->
 <g id="node19" class="node">
@@ -311,8 +310,8 @@
 <!-- PTR_NULL&#45;&gt;PTR_MORE_NIL -->
 <g id="edge28" class="edge">
 <title>PTR_NULL&#45;&gt;PTR_MORE_NIL</title>
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-<polygon fill="#555555" stroke="#555555" points="834.45,-242.91 834.23,-236.56 830.44,-241.66 834.45,-242.91"/>
+<path fill="none" stroke="#555555" d="M806.33,-293.52C812.78,-279.05 822.24,-257.81 829.5,-241.54"/>
+<polygon fill="#555555" stroke="#555555" points="831.32,-242.62 831.84,-236.28 827.48,-240.91 831.32,-242.62"/>
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 <!-- PTR_ANY -->
 <g id="node13" class="node">
@@ -331,41 +330,41 @@
 <!-- PTR_PERSON&#45;&gt;PTR_ANY -->
 <g id="edge20" class="edge">
 <title>PTR_PERSON&#45;&gt;PTR_ANY</title>
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-<polygon fill="#555555" stroke="#555555" points="507.58,-253.71 504.91,-247.94 503.4,-254.12 507.58,-253.71"/>
+<path fill="none" stroke="#555555" d="M534.66,-293.09C529.74,-281.77 523.08,-266.45 517.05,-252.6"/>
+<polygon fill="#555555" stroke="#555555" points="519.08,-251.99 514.76,-247.33 515.23,-253.67 519.08,-251.99"/>
 </g>
 <!-- PTR_PERSON&#45;&gt;PTR_S1 -->
 <!-- PTR_PERSON&#45;&gt;PTR_PERSON_NIL -->
 <g id="edge23" class="edge">
 <title>PTR_PERSON&#45;&gt;PTR_PERSON_NIL</title>
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-<polygon fill="#555555" stroke="#555555" points="625.26,-239.66 628.83,-234.4 622.76,-236.28 625.26,-239.66"/>
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+<polygon fill="#555555" stroke="#555555" points="627.67,-240.42 630.9,-234.94 624.96,-237.21 627.67,-240.42"/>
 </g>
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 <title>PTR_S1&#45;&gt;PTR_ANY</title>
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-<polygon fill="#555555" stroke="#555555" points="534.38,-248.62 528.7,-245.75 531.35,-251.53 534.38,-248.62"/>
+<path fill="none" stroke="#555555" d="M613.06,-297.17C595.19,-284.43 567.11,-264.41 543.66,-247.68"/>
+<polygon fill="#555555" stroke="#555555" points="545.14,-246.16 539.04,-244.39 542.7,-249.58 545.14,-246.16"/>
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 <!-- PTR_S1&#45;&gt;PTR_MORE -->
 <!-- PTR_S1&#45;&gt;PTR_S1_NIL -->
 <g id="edge24" class="edge">
 <title>PTR_S1&#45;&gt;PTR_S1_NIL</title>
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+<polygon fill="#555555" stroke="#555555" points="725.59,-238.26 729.01,-232.91 722.99,-234.96 725.59,-238.26"/>
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 <!-- PTR_MORE&#45;&gt;PTR_NULL -->
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 <title>PTR_MORE&#45;&gt;PTR_ANY</title>
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+<polygon fill="#555555" stroke="#555555" points="560.63,-241.01 554.29,-240.56 558.97,-244.86 560.63,-241.01"/>
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-<polygon fill="#555555" stroke="#555555" points="812.38,-238.85 816.22,-233.78 810.06,-235.35 812.38,-238.85"/>
+<path fill="none" stroke="#555555" d="M735.36,-294.98C756.57,-279.37 789.9,-254.84 813.23,-237.67"/>
+<polygon fill="#555555" stroke="#555555" points="814.42,-239.4 818.01,-234.16 811.93,-236.02 814.42,-239.4"/>
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@@ -397,8 +396,8 @@
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 <title>STRUCT_TOP&#45;&gt;STRUCT_PERSON</title>
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-<polygon fill="#555555" stroke="#555555" points="951.95,-244.58 948.43,-239.28 947.88,-245.61 951.95,-244.58"/>
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+<polygon fill="#555555" stroke="#555555" points="952.75,-244.54 949.09,-239.35 948.72,-245.69 952.75,-244.54"/>
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@@ -410,8 +409,8 @@
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 <g id="edge37" class="edge">
 <title>STRUCT_TOP&#45;&gt;STRUCT_S1</title>
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-<polygon fill="#555555" stroke="#555555" points="1018.94,-245.52 1017.54,-239.32 1014.76,-245.04 1018.94,-245.52"/>
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+<polygon fill="#555555" stroke="#555555" points="1018.55,-245.61 1017.24,-239.39 1014.39,-245.07 1018.55,-245.61"/>
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@@ -423,8 +422,8 @@
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 <g id="edge38" class="edge">
 <title>STRUCT_TOP&#45;&gt;STRUCT_S2</title>
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-<polygon fill="#555555" stroke="#555555" points="1096.43,-245.51 1097.45,-239.24 1092.74,-243.51 1096.43,-245.51"/>
+<path fill="none" stroke="#555555" d="M1012.67,-376.51C1034.35,-340.84 1071.93,-278.99 1093.18,-244.02"/>
+<polygon fill="#555555" stroke="#555555" points="1094.84,-245.33 1096.16,-239.11 1091.25,-243.14 1094.84,-245.33"/>
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 <g id="node25" class="node">
@@ -435,8 +434,8 @@
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 <g id="edge39" class="edge">
 <title>STRUCT_TOP&#45;&gt;STRUCT_MORE</title>
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-<polygon fill="#555555" stroke="#555555" points="1177.33,-242.26 1180.01,-236.5 1174.32,-239.34 1177.33,-242.26"/>
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+<polygon fill="#555555" stroke="#555555" points="1174.99,-242.01 1177.99,-236.4 1172.15,-238.92 1174.99,-242.01"/>
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 <!-- STRUCT_TOP&#45;&gt;MEM_TOP -->
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@@ -488,8 +487,8 @@
 <!-- MEM_TOP&#45;&gt;MEM_BOT -->
 <g id="edge44" class="edge">
 <title>MEM_TOP&#45;&gt;MEM_BOT</title>
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-<polygon fill="#555555" stroke="#555555" points="1296.1,-137.72 1294,-131.72 1291.9,-137.72 1296.1,-137.72"/>
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+<polygon fill="#555555" stroke="#555555" points="1296.1,-137.74 1294,-131.74 1291.9,-137.74 1296.1,-137.74"/>
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 <!-- MEM_TOP&#45;&gt;TUPLE_TOP -->
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@@ -501,38 +500,38 @@
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 <g id="node30" class="node">
 <title>TUPLE1</title>
-<polygon fill="#ffc0cb" stroke="black" points="1418.88,-339.96 1363.12,-339.96 1363.12,-303.96 1418.88,-303.96 1418.88,-339.96"/>
-<text text-anchor="middle" x="1391" y="-317.86" font-family="DejaVu Sans" font-size="13.00">(type)</text>
+<polygon fill="#ffc0cb" stroke="black" points="1418.88,-328.97 1363.12,-328.97 1363.12,-292.97 1418.88,-292.97 1418.88,-328.97"/>
+<text text-anchor="middle" x="1391" y="-306.87" font-family="DejaVu Sans" font-size="13.00">(type)</text>
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 <title>TUPLE_TOP&#45;&gt;TUPLE1</title>
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-<polygon fill="#555555" stroke="#555555" points="1397.16,-347.4 1394.11,-341.83 1393.02,-348.09 1397.16,-347.4"/>
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+<polygon fill="#555555" stroke="#555555" points="1397.61,-336.2 1394.46,-330.68 1393.48,-336.96 1397.61,-336.2"/>
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 <title>TUPLE2</title>
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-<text text-anchor="middle" x="1482" y="-317.86" font-family="DejaVu Sans" font-size="13.00">(type, type)</text>
+<polygon fill="#ffc0cb" stroke="black" points="1529,-328.97 1435,-328.97 1435,-292.97 1529,-292.97 1529,-328.97"/>
+<text text-anchor="middle" x="1482" y="-306.87" font-family="DejaVu Sans" font-size="13.00">(type, type)</text>
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 <title>TUPLE_TOP&#45;&gt;TUPLE2</title>
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-<polygon fill="#555555" stroke="#555555" points="1466.97,-347.48 1468.76,-341.38 1463.56,-345.02 1466.97,-347.48"/>
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+<polygon fill="#555555" stroke="#555555" points="1465.06,-336.38 1467.18,-330.39 1461.79,-333.74 1465.06,-336.38"/>
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-<text text-anchor="middle" x="1584" y="-317.86" font-family="DejaVu Sans" font-size="13.00">(type, …)</text>
+<polygon fill="#ffc0cb" stroke="black" points="1622.75,-328.97 1545.25,-328.97 1545.25,-292.97 1622.75,-292.97 1622.75,-328.97"/>
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 <title>TUPLE_TOP&#45;&gt;TUPLEN</title>
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 <g id="edge50" class="edge">
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-- 
cgit v1.2.3