From 4ce3e9c7c11744abae52d7a3ae1a3962395784be Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Thu, 23 May 2024 10:41:10 +0200
Subject: Import test suite from charon

---
 tests/src/nested_borrows.rs | 181 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 181 insertions(+)
 create mode 100644 tests/src/nested_borrows.rs

(limited to 'tests/src/nested_borrows.rs')

diff --git a/tests/src/nested_borrows.rs b/tests/src/nested_borrows.rs
new file mode 100644
index 00000000..94db0cec
--- /dev/null
+++ b/tests/src/nested_borrows.rs
@@ -0,0 +1,181 @@
+//! This module contains functions with nested borrows in their signatures.
+
+pub fn id_mut_mut<'a, 'b, T>(x: &'a mut &'b mut T) -> &'a mut &'b mut T {
+    x
+}
+
+pub fn id_mut_pair<'a, T>(x: &'a mut (&'a mut T, u32)) -> &'a mut (&'a mut T, u32) {
+    x
+}
+
+pub fn id_mut_pair_test1() {
+    let mut x: u32 = 0;
+    let px = &mut x;
+    let mut p = (px, 1);
+    let pp0 = &mut p;
+    let pp1 = id_mut_pair(pp0);
+    let mut y = 2;
+    *pp1 = (&mut y, 3);
+}
+
+pub fn id_mut_mut_pair<'a, T>(
+    x: &'a mut &'a mut (&'a mut T, u32),
+) -> &'a mut &'a mut (&'a mut T, u32) {
+    x
+}
+
+pub fn id_mut_mut_mut_same<'a, T>(x: &'a mut &'a mut &'a mut u32) -> &'a mut &'a mut &'a mut u32 {
+    x
+}
+
+pub fn id_borrow1<'a, 'b, 'c>(_x: &'a mut &'b u32, _y: &'a &'a mut u32) {
+    ()
+}
+
+/// For symbolic execution: testing what happens with several abstractions.
+pub fn id_mut_mut_test1() {
+    let mut x = 0;
+    let mut px = &mut x;
+    let ppx = &mut px;
+    let ppy = id_mut_mut(ppx);
+    **ppy = 1;
+    // Ending one abstraction
+    assert!(*px == 1);
+    // Ending the other abstraction
+    assert!(x == 1);
+}
+
+/*
+/// For symbolic execution: testing what happens with several abstractions.
+/// This case is a bit trickier, because we modify the borrow graph through
+/// a value returned by a function call.
+/// TODO: not supported! We overwrite a borrow in a returned value.
+pub fn id_mut_mut_test2() {
+    let mut x = 0;
+    let mut px = &mut x;
+    let ppx = &mut px;
+    let ppy = id_mut_mut(ppx);
+    **ppy = 1;
+    // This time, we replace one of the borrows
+    let mut y = 2;
+    let py = &mut y;
+    *ppy = py;
+    // Ending one abstraction
+    assert!(*px == 2);
+    *px = 3;
+    // Ending the other abstraction
+    assert!(x == 1);
+    assert!(y == 3);
+}
+*/
+
+/*
+/// For symbolic execution: testing what happens with several abstractions.
+/// See what happens when chaining function calls.
+/// TODO: not supported! We overwrite a borrow in a returned value.
+pub fn id_mut_mut_test3() {
+    let mut x = 0;
+    let mut px = &mut x;
+    let ppx = &mut px;
+    let ppy = id_mut_mut(ppx); // &'a mut &'b mut i32
+    **ppy = 1;
+    let ppz = id_mut_mut(ppy); // &'c mut &'b mut i32
+    **ppz = 2;
+    // End 'a and 'c
+    assert!(*px == 2);
+    // End 'b (2 abstractions at once)
+    assert!(x == 2);
+}*/
+
+/*
+/// For symbolic execution: testing what happens with several abstractions.
+/// See what happens when chaining function calls.
+/// This one is slightly more complex than the previous one.
+pub fn id_mut_mut_test4() {
+    let mut x = 0;
+    let mut px = &mut x;
+    let ppx = &mut px;
+    let ppy = id_mut_mut(ppx); // &'a mut &'b mut i32
+    **ppy = 1;
+    let ppz = id_mut_mut(ppy); // &'c mut &'b mut i32
+    **ppz = 2;
+    // End 'c
+    assert!(**ppy == 2);
+    // End 'a
+    assert!(*px == 2);
+    // End 'b (2 abstractions at once)
+    assert!(x == 2);
+}
+*/
+
+fn id<'a, T>(x: &'a mut T) -> &'a mut T {
+    x
+}
+
+/// Checking projectors over symbolic values
+pub fn test_borrows1() {
+    let mut x = 3;
+    let y = id(&mut x);
+    let z = id(y);
+    // We do not write a statement which would expand `z` on purpose:
+    // we want to test that the handling of non-expanded symbolic values
+    // is correct
+    assert!(x == 3);
+}
+
+fn id_pair<'a, 'b, T>(x: &'a mut T, y: &'b mut T) -> (&'a mut T, &'b mut T) {
+    (x, y)
+}
+
+/// Similar to the previous one
+pub fn test_borrows2() {
+    let mut x = 3;
+    let mut y = 4;
+    let z = id_pair(&mut x, &mut y);
+    // We do not write a statement which would expand `z` on purpose:
+    // we want to test that the handling of non-expanded symbolic values
+    // is correct
+    assert!(x == 3);
+    assert!(y == 4);
+}
+
+/// input type: 'b must last longer than 'a
+/// output type: 'a must last longer than 'b
+/// So: 'a = 'b, and the function is legal.
+pub fn nested_mut_borrows1<'a, 'b>(x: &'a mut &'b mut u32) -> &'b mut &'a mut u32 {
+    x
+}
+
+pub fn nested_shared_borrows1<'a, 'b>(x: &'a &'b u32) -> &'a &'b u32 {
+    x
+}
+
+pub fn nested_borrows1<'a, 'b>(x: &'a mut &'b u32) -> &'a mut &'b u32 {
+    x
+}
+
+pub fn nested_borrows2<'a, 'b>(x: &'a &'b mut u32) -> &'a &'b mut u32 {
+    x
+}
+
+fn nested_borrows1_test1() {
+    let x = 0;
+    let mut px = &x;
+    let ppx = &mut px;
+    let ppy = nested_borrows1(ppx);
+    assert!(**ppy == 0);
+    assert!(x == 0);
+}
+
+fn nested_borrows1_test2<'a, 'b>(x: &'a mut &'b u32) -> &'a mut &'b u32 {
+    nested_borrows1(x)
+}
+
+fn nested_borrows2_test1() {
+    let mut x = 0;
+    let px = &mut x;
+    let ppx = &px;
+    let ppy = nested_borrows2(ppx);
+    assert!(**ppy == 0);
+    assert!(x == 0);
+}
-- 
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