Add a wishlist folder to the test suite, with things that we do not support (yet!)

The curent examples include semi-bugs regarding calc statements and strings, and
stuff about sequences

1 files changed, 25 insertions, 0 deletions

diff --git a/Test/wishlist/sequences-s0-in-s.dfy b/Test/wishlist/sequences-s0-in-s.dfy
new file mode 100644
index 00000000..20127917
--- /dev/null
+++ b/Test/wishlist/sequences-s0-in-s.dfy
@@ -0,0 +1,25 @@
+// RUN: %dafny /compile:0 /autoTriggers:1 /print:"%t.print" /dprint:"%t.dprint" "%s" > "%t"

+// RUN: %diff "%s.expect" "%t"

+

+// The following is also due to a weakness in the axiomatization: namely, it is

+// not easy to learn, using Dafny's axioms, that s[0] in s. One can of course

+// prove it, but it doesn't come for free.

+

+method InSeqTriggers(s: seq<int>, i: nat)

+  requires forall x :: x in s ==> x > 0;

+  requires |s| > 0 {

+    if * {

+      // Fails

+      assert s[0] > 0; // WISH

+    } else if * {

+      // Works

+      assert s[0] in s;

+      assert s[0] > 0;

+    }

+}

+

+method InSeqNoAutoTriggers(s: seq<int>, i: nat)

+  requires forall x {:autotriggers false} :: x in s ==> x > 0;

+  requires |s| > 0 {

+    assert s[0] > 0; // Works

+}