From 21968aa53b9161969a9c28e9a4deac95e0d91cc2 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sat, 10 Apr 2021 12:09:10 +0200
Subject: [PATCH] add test to detect dropped temporary

---
 .../dangling_pointers/stack_temporary.rs           | 14 ++++++++++++++
 .../storage_dead_dangling.rs                       |  0
 2 files changed, 14 insertions(+)
 create mode 100644 tests/compile-fail/dangling_pointers/stack_temporary.rs
 rename tests/compile-fail/{ => dangling_pointers}/storage_dead_dangling.rs (100%)

diff --git a/tests/compile-fail/dangling_pointers/stack_temporary.rs b/tests/compile-fail/dangling_pointers/stack_temporary.rs
new file mode 100644
index 0000000000..cbd788bbf4
--- /dev/null
+++ b/tests/compile-fail/dangling_pointers/stack_temporary.rs
@@ -0,0 +1,14 @@
+// This should fail even without validation, but some MIR opts mask the error
+// compile-flags: -Zmiri-disable-validation -Zmir-opt-level=0
+
+unsafe fn make_ref<'a>(x: *mut i32) -> &'a mut i32 {
+    &mut *x
+}
+
+fn main() {
+    unsafe {
+        let x = make_ref(&mut 0); // The temporary storing "0" is deallocated at the ";"!
+        let val = *x; //~ ERROR dereferenced after this allocation got freed
+        println!("{}", val);
+    }
+}
diff --git a/tests/compile-fail/storage_dead_dangling.rs b/tests/compile-fail/dangling_pointers/storage_dead_dangling.rs
similarity index 100%
rename from tests/compile-fail/storage_dead_dangling.rs
rename to tests/compile-fail/dangling_pointers/storage_dead_dangling.rs