1 files changed, 44 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/torture/pr42704.C b/gcc/testsuite/g++.dg/torture/pr42704.C
new file mode 100644
index 000000000..735b1e7bd
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr42704.C
@@ -0,0 +1,44 @@
+/* { dg-do compile } */
+
+typedef int PRInt32;
+class nsTreeRows {
+    class Subtree { };
+    enum { kMaxDepth = 32 };
+    struct Link {
+        Subtree* mParent;
+        PRInt32 mChildIndex;
+        Link&         operator=(const Link& aLink) {
+            mParent = aLink.mParent;
+            mChildIndex = aLink.mChildIndex;
+        }
+    };
+    class iterator {
+        PRInt32 mTop;
+        PRInt32 mRowIndex;
+        Link mLink[kMaxDepth];
+    public:
+        iterator() : mTop(-1), mRowIndex(-1) { }
+        iterator& operator=(const iterator& aIterator);
+    };
+    Subtree*     EnsureSubtreeFor(Subtree* aParent, PRInt32 aChildIndex);
+    Subtree*     GetSubtreeFor(const Subtree* aParent,
+PRInt32 aChildIndex,                   PRInt32* aSubtreeSize = 0);
+    void     InvalidateCachedRow() {
+        mLastRow = iterator();
+    }
+    iterator mLastRow;
+};
+nsTreeRows::Subtree* nsTreeRows::EnsureSubtreeFor(Subtree* aParent,
+                     PRInt32 aChildIndex) {
+    Subtree* subtree = GetSubtreeFor(aParent, aChildIndex);
+    if (! subtree) {
+        InvalidateCachedRow();
+    }
+}
+nsTreeRows::iterator& nsTreeRows::iterator::operator=(const iterator&
+aIterator) {
+    mTop = aIterator.mTop;
+    for (PRInt32 i = mTop;
+         i >= 0;
+         --i)         mLink[i] = aIterator.mLink[i];
+}