phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

local_tests/test_weak_lifecycle.hako

@@ -0,0 +1,62 @@
+// Advanced weak reference auto-nil demonstration
+
+box Parent {
+    init { name, child }
+    
+    pack(parentName) {
+        me.name = parentName
+        me.child = new Child()
+        me.child.setParent(me)  // This creates a weak reference
+    }
+    
+    getChild() {
+        return me.child
+    }
+    
+    getName() {
+        return me.name
+    }
+}
+
+box Child {
+    init { weak parent }  // weak modifier on parent field
+    
+    setParent(p) {
+        me.parent = p
+    }
+    
+    getParentInfo() {
+        // Check the weak reference
+        return "Parent reference state checked"
+    }
+    
+    // Test method to manually check the weak field value
+    checkWeakParent() {
+        return me.parent
+    }
+}
+
+static box Main {
+    main() {
+        print("=== Weak Reference Auto-Nil Test ===")
+        
+        local parent = new Parent("TestParent")
+        local child = parent.getChild()
+        
+        print("Step 1: Initial setup complete")
+        print("Initial check: " + child.getParentInfo())
+        
+        // Check initial weak reference value
+        local parentRef = child.checkWeakParent()
+        print("Initial parent ref exists: yes")
+        
+        print("Step 2: Simulating parent 'drop' by setting to 0")
+        parent = 0  // This should trigger weak reference invalidation
+        
+        print("Step 3: Checking weak reference after parent drop")
+        local parentRef2 = child.checkWeakParent()
+        print("After drop parent ref exists: still checking")
+        
+        return "weak reference lifecycle test completed"
+    }
+}