1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/nll/polonius/storagedead-kills-loans.rs b/src/test/ui/nll/polonius/storagedead-kills-loans.rs
new file mode 100644
index 000000000..669e077de
--- /dev/null
+++ b/src/test/ui/nll/polonius/storagedead-kills-loans.rs
@@ -0,0 +1,28 @@
+// Whenever a `StorageDead` MIR statement destroys a value `x`,
+// we should kill all loans of `x`. This is extracted from `rand 0.4.6`,
+// is correctly accepted by NLL but was incorrectly rejected by
+// Polonius because of these missing `killed` facts.
+
+// check-pass
+// compile-flags: -Z polonius
+
+use std::{io, mem};
+use std::io::Read;
+
+#[allow(dead_code)]
+fn fill(r: &mut dyn Read, mut buf: &mut [u8]) -> io::Result<()> {
+    while buf.len() > 0 {
+        match r.read(buf).unwrap() {
+            0 => return Err(io::Error::new(io::ErrorKind::Other,
+                                           "end of file reached")),
+            n => buf = &mut mem::replace(&mut buf, &mut [])[n..],
+            // ^- Polonius had multiple errors on the previous line (where NLL has none)
+            // as it didn't know `buf` was killed here, and would
+            // incorrectly reject both the borrow expression, and the assignment.
+        }
+    }
+    Ok(())
+}
+
+fn main() {
+}