From afe15cc3208b16b95109f056656c1c3d312841cc Mon Sep 17 00:00:00 2001
From: Son Ho
Date: Wed, 5 Jun 2024 17:04:05 +0200
Subject: Add some negative tests for the borrow checker

---
 tests/src/borrow-check-negative.borrow-check.out | 15 ++++
 tests/src/borrow-check-negative.rs               | 90 ++++++++++++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 tests/src/borrow-check-negative.borrow-check.out
 create mode 100644 tests/src/borrow-check-negative.rs

diff --git a/tests/src/borrow-check-negative.borrow-check.out b/tests/src/borrow-check-negative.borrow-check.out
new file mode 100644
index 00000000..dc9dd5a7
--- /dev/null
+++ b/tests/src/borrow-check-negative.borrow-check.out
@@ -0,0 +1,15 @@
+[Info ] Imported: tests/llbc/borrow_check_negative.llbc
+[Error] Can not apply a projection to the ⊥ value
+Source: 'tests/src/borrow-check-negative.rs', lines 17:4-24:1
+[Error] Can't end abstraction 8 as it is set as non-endable
+Source: 'tests/src/borrow-check-negative.rs', lines 26:0-26:76
+[Error] Can not apply a projection to the ⊥ value
+Source: 'tests/src/borrow-check-negative.rs', lines 37:4-41:1
+[Error] Can not apply a projection to the ⊥ value
+Source: 'tests/src/borrow-check-negative.rs', lines 47:4-50:1
+[Error] Can not apply a projection to the ⊥ value
+Source: 'tests/src/borrow-check-negative.rs', lines 60:4-64:1
+[Error] Can not apply a projection to the ⊥ value
+Source: 'tests/src/borrow-check-negative.rs', lines 71:4-79:1
+[Error] Can not apply a projection to the ⊥ value
+Source: 'tests/src/borrow-check-negative.rs', lines 87:4-90:1
diff --git a/tests/src/borrow-check-negative.rs b/tests/src/borrow-check-negative.rs
new file mode 100644
index 00000000..697546dd
--- /dev/null
+++ b/tests/src/borrow-check-negative.rs
@@ -0,0 +1,90 @@
+//@ [!borrow-check] skip
+//@ [borrow-check] known-failure
+// Some negative tests for borrow checking
+
+// This succeeds
+fn choose<'a, T>(b: bool, x: &'a mut T, y: &'a mut T) -> &'a mut T {
+    if b {
+        x
+    } else {
+        y
+    }
+}
+
+pub fn choose_test() {
+    let mut x = 0;
+    let mut y = 0;
+    let z = choose(true, &mut x, &mut y);
+    *z += 1;
+    assert!(*z == 1);
+    // drop(z)
+    assert!(x == 1);
+    assert!(y == 0);
+    assert!(*z == 1); // z is not valid anymore
+}
+
+fn choose_wrong<'a, 'b, T>(b: bool, x: &'a mut T, y: &'b mut T) -> &'a mut T {
+    if b {
+        x
+    } else {
+        y // Expected lifetime 'a
+    }
+}
+
+fn test_mut1(b: bool) {
+    let mut x = 0;
+    let mut y = 1;
+    let z = if b { &mut x } else { &mut y };
+    *z += 1;
+    assert!(x >= 0);
+    *z += 1; // z is not valid anymore
+}
+
+#[allow(unused_assignments)]
+fn test_mut2(b: bool) {
+    let mut x = 0;
+    let mut y = 1;
+    let z = if b { &x } else { &y };
+    x += 1;
+    assert!(*z == 0); // z is not valid anymore
+}
+
+fn test_move1<T>(x: T) -> T {
+    let _ = x;
+    return x; // x has been moved
+}
+
+pub fn refs_test1() {
+    let mut x = 0;
+    let mut px = &mut x;
+    let ppx = &mut px;
+    **ppx = 1;
+    assert!(x == 1);
+    assert!(**ppx == 1); // ppx has ended
+}
+
+pub fn refs_test2() {
+    let mut x = 0;
+    let mut y = 1;
+    let mut px = &mut x;
+    let py = &mut y;
+    let ppx = &mut px;
+    *ppx = py;
+    **ppx = 2;
+    assert!(*px == 2);
+    assert!(x == 0);
+    assert!(*py == 2);
+    assert!(y == 2);
+    assert!(**ppx == 2); // ppx has ended
+}
+
+pub fn test_box1() {
+    use std::ops::Deref;
+    use std::ops::DerefMut;
+    let mut b: Box<i32> = Box::new(0);
+    let x0 = b.deref_mut();
+    *x0 = 1;
+    let x1 = b.deref();
+    assert!(*x1 == 1);
+    assert!(*x0 == 1); // x0 has ended
+}
-- 
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