Added a stress test for the segv

Makefile

@@ -31,3 +31,6 @@ run: all
 
 clean:
 	@rm -vf auto constexpr core* ilists init init_new lambda loops regex1 regex2 thread thread2 tuple
+
+stress: thread2
+	./stress.zsh

stress.zsh

@@ -0,0 +1,11 @@
+#!/bin/zsh
+while true
+do
+    ./thread2
+    if [[ $? != 0 ]]
+    then
+        break
+    fi
+done
+
+echo "there was a problem"