From 9a5ca20d2537179f3a8e01762c8db6b52a4db2d9 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Sat, 3 Oct 2026 14:03:48 -0700
Subject: Chapter 17a: Mutability and Read-Only Views

---
 .../java/com/seaofnodes/simple/fuzzer/ScriptGenerator.java | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

(limited to 'src/test/java/com/seaofnodes/simple/fuzzer')

diff --git a/src/test/java/com/seaofnodes/simple/fuzzer/ScriptGenerator.java b/src/test/java/com/seaofnodes/simple/fuzzer/ScriptGenerator.java
index d3cbb0ee..183dcb84 100644
--- a/src/test/java/com/seaofnodes/simple/fuzzer/ScriptGenerator.java
+++ b/src/test/java/com/seaofnodes/simple/fuzzer/ScriptGenerator.java
@@ -479,7 +479,7 @@ public class ScriptGenerator {
         for (int i=0; i<fields.length; i++) {
             var fieldName = getRandomName();
             var type = getType(true);
-            printIndentation().append(type.name).append(" ").append(fieldName).append(";\n");
+            printIndentation().append(declType(type)).append(" !").append(fieldName).append(";\n");
             fields[i] = new TypeStruct.Field(fieldName.toString(), type, struct);
         }
         indentation -= INDENTATION;
@@ -676,14 +676,16 @@ public class ScriptGenerator {
         return 0;
     }
 
-    /**
-     * Generate a declaration statement.
-     * @return 0
-     */
+    // This generator mutates references and fields; request both permissions.
+    private static String declType(Type type) {
+        return (type instanceof TypeStruct || type instanceof TypeNullable ? "!" : "") + type.name;
+    }
+
+    /** Generate a declaration statement. */
     public int genDecl() {
         var type = getType();
         var name = getVarName();
-        sb.append(generateInvalid() ? getRandomName() : type.name).append(" ").append(name);
+        sb.append(generateInvalid() ? getRandomName() : declType(type)).append(" !").append(name);
         if (!(type instanceof TypeNullable) || random.nextBoolean()) {
             sb.append("=");
             genExpression(type, true);
-- 
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