1 files changed, 19 insertions, 0 deletions
diff --git a/Test/dafny0/fun-with-slices.dfy b/Test/dafny0/fun-with-slices.dfy
new file mode 100644
index 00000000..3d8da242
--- /dev/null
+++ b/Test/dafny0/fun-with-slices.dfy
@@ -0,0 +1,19 @@
+// RUN: %dafny /compile:0 /print:"%t.print" /dprint:"%t.dprint" "%s" > "%t"
+// RUN: %diff "%s.expect" "%t"
+
+// This test was contributed by Bryan. It has shown some instabilities in the past.
+
+method seqIntoArray<A>(s: seq<A>, a: array<A>, index: nat)
+  requires a != null
+  requires index + |s| <= a.Length
+  modifies a
+  ensures  a[..] == old(a[0..index]) + s + old(a[index + |s|..]) {
+    var i := index;
+
+    while i < index + |s|
+      invariant index <= i <= index + |s| <= a.Length
+      invariant a[..] == old(a[0..index]) + s[0..(i-index)] + old(a[i..]) {
+        a[i] := s[i - index];
+        i := i + 1;
+    }
+}