Fixme issue for model-checking#556

tests/kani/Iterator/into_iter_fixme.rs

@@ -0,0 +1,11 @@
+// compile-flags: --edition 2018
+// cbmc-flags: --unwind 4 --object-bits 9
+//
+// This reproduces the issue seen in "Failures when iterating over results".
+// See https://github.com/model-checking/kani/issues/556 for more information.
+#[kani::proof]
+pub fn main() {
+    let numbers = vec![1, 10, -1];
+    let positives: Vec<_> = numbers.into_iter().filter(|&n| n > 0).collect();
+    assert_eq!(positives.len(), 2);
+}