1 files changed, 46 insertions, 0 deletions
diff --git a/tests/ui/nll/polonius/polonius-smoke-test.rs b/tests/ui/nll/polonius/polonius-smoke-test.rs
new file mode 100644
index 000000000..c4344af71
--- /dev/null
+++ b/tests/ui/nll/polonius/polonius-smoke-test.rs
@@ -0,0 +1,46 @@
+// Check that Polonius borrow check works for simple cases.
+// compile-flags: -Z polonius
+
+pub fn return_ref_to_local() -> &'static i32 {
+    let x = 0;
+    &x //~ ERROR
+}
+
+pub fn use_while_mut() {
+    let mut x = 0;
+    let y = &mut x;
+    let z = x; //~ ERROR
+    let w = y;
+}
+
+pub fn use_while_mut_fr(x: &mut i32) -> &mut i32 {
+    let y = &mut *x;
+    let z = x; //~ ERROR
+    y
+}
+
+// Cases like this are why we have Polonius.
+pub fn position_dependent_outlives(x: &mut i32, cond: bool) -> &mut i32 {
+    let y = &mut *x;
+    if cond {
+        return y;
+    } else {
+        *x = 0;
+        return x;
+    }
+}
+
+fn foo<'a, 'b>(p: &'b &'a mut usize) -> &'b usize {
+    p
+}
+
+// Check that we create constraints for well-formedness of function arguments
+fn well_formed_function_inputs() {
+    let s = &mut 1;
+    let r = &mut *s;
+    let tmp = foo(&r);
+    s; //~ ERROR
+    tmp;
+}
+
+fn main() {}