1 files changed, 21 insertions, 0 deletions
diff --git a/Test/dafny0/DatatypeUpdate.dfy b/Test/dafny0/DatatypeUpdate.dfy
new file mode 100644
index 00000000..d78b453c
--- /dev/null
+++ b/Test/dafny0/DatatypeUpdate.dfy
@@ -0,0 +1,21 @@
+
+datatype MyDataType = MyConstructor(myint:int, mybool:bool) 
+                    | MyOtherConstructor(otherbool:bool) 
+                    | MyNumericConstructor(42:int);
+
+method test(foo:MyDataType, x:int) returns (abc:MyDataType, def:MyDataType, ghi:MyDataType, jkl:MyDataType)
+    requires foo.MyConstructor?;
+    ensures abc == foo[myint := x + 2];
+    ensures def == foo[otherbool := !foo.mybool];
+    ensures ghi == foo[myint := 2][mybool := false];
+    //ensures jkl == foo[non_destructor := 5];      // Resolution error: no non_destructor in MyDataType
+    ensures jkl == foo[42 := 7];
+{
+    abc := MyConstructor(x + 2, foo.mybool); 
+    abc := foo[myint := x + 2];
+    def := MyOtherConstructor(!foo.mybool);
+    ghi := MyConstructor(2, false);
+    jkl := foo[42 := 7];
+
+    assert abc[myint := abc.myint - 2] == foo[myint := x];
+}