--- a/src/pt.h	Wed Jan 31 22:15:55 2001 +0000
+++ b/src/pt.h	Fri Feb 02 02:21:42 2001 +0000
@@ -40,7 +40,7 @@
 {
 public:
 
-  tree (int l = -1, int c = -1)
+  tree (int l = -1, int c = -1) : break_point(false)
     {
       line_num = l;
       column_num = c;
@@ -58,6 +58,15 @@
 
   std::string str_print_code (void);
 
+  virtual void set_breakpoint (void)
+    { break_point = true; }
+  
+  virtual void delete_breakpoint (void)
+    { break_point = false; }
+
+  virtual bool is_breakpoint (void) const 
+    { return break_point; }
+
 private:
 
   // The input line and column where we found the text that was
@@ -65,6 +74,9 @@
   int line_num;
   int column_num;
 
+  // Stop before executing this tree node
+  bool break_point;
+
   // No copying!
 
   tree (const tree&);