2 files changed, 3 insertions, 3 deletions
diff --git a/chapter12/src/main/java/com/seaofnodes/simple/Parser.java b/chapter12/src/main/java/com/seaofnodes/simple/Parser.java
index 0fa7ee0a..a25edeb1 100644
--- a/chapter12/src/main/java/com/seaofnodes/simple/Parser.java
+++ b/chapter12/src/main/java/com/seaofnodes/simple/Parser.java
@@ -602,7 +602,7 @@ public class Parser {
         Node prior = mem().keep();
         Node st = new StoreNode(name,alias,glb,null,prior,ptr,val,init).peephole();
         mem(new MemMergeNode(prior,alias,st).peephole());
-        prior.unkeep();
+        if( prior.unkeep().isUnused() ) prior.kill();
     }
 
     /**
diff --git a/chapter12/src/test/java/com/seaofnodes/simple/Chapter10Test.java b/chapter12/src/test/java/com/seaofnodes/simple/Chapter10Test.java
index 55574c13..e5d9b882 100644
--- a/chapter12/src/test/java/com/seaofnodes/simple/Chapter10Test.java
+++ b/chapter12/src/test/java/com/seaofnodes/simple/Chapter10Test.java
@@ -549,8 +549,8 @@ return 0;
             if (arg) s.x=arg+1; else s.x=arg+2;
             return s;
             """).parse().iterate();
-        // The initializing slice also remains live as the aggregate default.
-        assertEquals(2,countMemoryNodes(stop,StoreNode.class,new BitSet()));
+        // Releasing the old aggregate exposes the overwritten initializing Store.
+        assertEquals(1,countMemoryNodes(stop,StoreNode.class,new BitSet()));
         assertEquals(2L,((Evaluator.Obj)Evaluator.evaluate(stop,0)).fields()[0]);
         assertEquals(4L,((Evaluator.Obj)Evaluator.evaluate(stop,3)).fields()[0]);
     }