2 files changed, 14 insertions, 1 deletions
diff --git a/chapter16/src/test/java/com/seaofnodes/simple/Chapter10Test.java b/chapter16/src/test/java/com/seaofnodes/simple/Chapter10Test.java
index 2b07234f..408a4814 100644
--- a/chapter16/src/test/java/com/seaofnodes/simple/Chapter10Test.java
+++ b/chapter16/src/test/java/com/seaofnodes/simple/Chapter10Test.java
@@ -48,6 +48,7 @@ public class Chapter10Test {
     public void testNullGuardErrors() {
         for( String body : new String[] {
             "return p.x;",
+            "if (p == null) return p.x; return -1;",
             "if (!!points) return p.x; return -1;",
             "if (!!p) { int x = p.x; } return p.x;"
         } ) {
@@ -55,7 +56,10 @@ public class Chapter10Test {
                 new Parser(NULLABLE_POINT_SOURCE+body).parse().iterate();
                 fail(body);
             } catch( RuntimeException e ) {
-                assertEquals(body,"Might be null accessing 'x'",e.getMessage());
+                // Known null is rejected during parsing in these chapters.
+                String expected = body.startsWith("if (p == null)")
+                    ? "Accessing unknown field 'x' from 'null'" : "Might be null accessing 'x'";
+                assertEquals(body,expected,e.getMessage());
             }
         }
     }
diff --git a/chapter16/src/test/java/com/seaofnodes/simple/Chapter16Test.java b/chapter16/src/test/java/com/seaofnodes/simple/Chapter16Test.java
index ad287e82..6fb41233 100644
--- a/chapter16/src/test/java/com/seaofnodes/simple/Chapter16Test.java
+++ b/chapter16/src/test/java/com/seaofnodes/simple/Chapter16Test.java
@@ -9,6 +9,15 @@ import static org.junit.Assert.fail;
 public class Chapter16Test {
 
     @Test
+    public void testStructFinal3() {
+        for( String fields : new String[] { "int[] x;", "int[] !x;" } ) {
+            String src = "struct Point { "+fields+" }; Point p = new Point; p.x++; return p;";
+            try { new Parser(src).parse().iterate(); fail(fields); }
+            catch( Exception e ) { assertEquals("'Point' is not fully initialized, field 'x' needs to be set in a constructor",e.getMessage()); }
+        }
+    }
+
+    @Test
     public void testJig() {
         Parser parser = new Parser(
 """