1 files changed, 33 insertions, 0 deletions
diff --git a/Test/dafny0/ContainerRanks.dfy b/Test/dafny0/ContainerRanks.dfy
new file mode 100644
index 00000000..df35e214
--- /dev/null
+++ b/Test/dafny0/ContainerRanks.dfy
@@ -0,0 +1,33 @@
+// RUN: %dafny /compile:0 /dprint:"%t.dprint" "%s" > "%t"
+// RUN: %diff "%s.expect" "%t"
+
+datatype Abc = End | Wrapper(seq<Abc>)
+
+lemma SeqRank0(a: Abc)
+  ensures a != Wrapper([a])
+{
+  assert [a][0] == a;  // TODO: one could consider strengthening axioms to eliminate the need for this assert
+                       // The reason we need the assert is to match the trigger in the rank axioms produced
+                       // for datatypes containing sequences.
+                       // See "is SeqType" case of AddDatatype in Translator.cs
+}
+
+lemma SeqRank1(s: seq<Abc>)
+  requires s != []
+  ensures s[0] != Wrapper(s)
+{
+}
+
+datatype Def = End | MultiWrapper(multiset<Def>)
+
+lemma MultisetRank(a: Def)
+  ensures a != MultiWrapper(multiset{a})
+{
+}
+
+datatype Ghi = End | SetWrapper(set<Ghi>)
+
+lemma SetRank(a: Ghi)
+  ensures a != SetWrapper({a})
+{
+}