1 files changed, 44 insertions, 0 deletions
diff --git a/Test/dafny0/Counter.dfy b/Test/dafny0/Counter.dfy
new file mode 100644
index 00000000..c38b28dc
--- /dev/null
+++ b/Test/dafny0/Counter.dfy
@@ -0,0 +1,44 @@
+// Concrete language syntax for a Dafny extension with refinement. 
+// 6/28/2010
+
+class A { 
+  var n : int;
+    
+  method Init() modifies this; 
+  { n := 0;}
+
+  method Inc() modifies this; 
+  { n := n + 1;}
+
+  method Dec() 
+    modifies this;
+    requires n > 0; 
+  { n := n - 1;}  
+  
+  method Test1() returns (i: int) 
+  { i := 0;}
+
+  method Test2() returns (o: object)
+  { o := this; }
+}
+
+class B refines A {
+  var inc : int, dec : int;
+    
+  replaces n by n == inc - dec;
+  // transforms n into inc - dec;
+    
+  refines Init() modifies this;
+  { inc := 0; dec := 0;}
+    
+  refines Inc() modifies this;
+  { inc := inc + 1; }  
+  
+  refines Dec() 
+    modifies this;
+    requires inc > dec; 
+  { dec := dec + 1; }
+}
+
+    
+