Add higher-order-functions and some other goodies

  * The reads clause now needs to be self framing.

  * The requires clause now needs to be framed by the reads clause.

  * There are one-shot lambdas, with a single arrow, but they will probably be
    removed.

  * There is a {:heapQuantifier} attribute to quantifiers, but they will
    probably be removed.

  * Add smart handling of type variables

  * Add < and > for datatype & type parameter

1 files changed, 25 insertions, 0 deletions

diff --git a/Test/hofs/OneShot.dfy b/Test/hofs/OneShot.dfy
new file mode 100644
index 00000000..73b08fe2
--- /dev/null
+++ b/Test/hofs/OneShot.dfy
@@ -0,0 +1,25 @@
+// RUN: %dafny /compile:0 "%s" > "%t"
+// RUN: %diff "%s.expect" "%t"
+
+class Ref<A> {
+  var val : A;
+}
+
+method OneShot() {
+  var g : () -> bool;
+  var i : Ref<int>;
+  i := new Ref;
+
+  g := () -> true;
+
+  assert g();
+
+  i.val := i.val + 1; // heap changes
+
+  if * {
+    assert g();         // should fail
+  } else {
+    assert !g();        // should fail
+  }
+}
+