1 files changed, 21 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/torture/pr57478.c b/gcc-4.9/gcc/testsuite/gcc.dg/torture/pr57478.c
new file mode 100644
index 000000000..e81348dfd
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/torture/pr57478.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+
+typedef struct Node Node;
+
+struct Node
+{
+  Node *Pred, *Suc;
+  Node *SubBestPred;
+  Node *SubBestSuc;
+};
+
+void
+foo (Node *N)
+{
+  do
+    {
+      N->SubBestPred = N->Pred;
+      N->SubBestSuc = N->Suc;
+    }
+  while (N = N->Suc);
+}