1 files changed, 32 insertions, 0 deletions
diff --git a/test/DSGraphs/ggcollapse.c b/test/DSGraphs/ggcollapse.c
new file mode 100644
index 0000000000..c055caf668
--- /dev/null
+++ b/test/DSGraphs/ggcollapse.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+typedef struct Tree_struct {
+  int data;
+  struct Tree_struct *left, *right;
+} Tree;
+
+static Tree T1, T2, T3, T4, T5;
+static Tree *Root, *ANode;
+static int  N = 4107;
+
+/* forces *Tb->right to be collapsed */
+void makeMore(Tree* Ta, Tree* Tb)
+{
+  Ta->left  = &T1;
+  Ta->right = &T2;
+  Tb->left  = &T4;
+  Tb->right = (Tree*) (((char*) &T5) + 5); /* point to fifth byte of T5 */
+}
+
+void makeRoots()
+{
+  T1.left = &T2;
+  makeMore(&T1, &T3);
+}
+
+int main()
+{
+  makeRoots();
+  T3.right = &T4;
+  printf("T3.data = %d\n", T3.data);
+}