[clang] [LifetimeSafety] Introduce a liveness-based lifetime policy (PR #159991)

[Utkarsh Saxena via cfe-commits]

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@@ -372,6 +421,19 @@ void no_error_if_dangle_then_rescue_gsl() {
   v.use();     // This is safe.
 }
 
+void no_error_loan_from_current_iteration(bool cond) {
+  // See https://github.com/llvm/llvm-project/issues/156959.
+  MyObj b;
+  while (cond) {
+    MyObj a;
+    View p = b;
+    if (cond) {
+      p = a;
+    }
+    (void)p;
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usx95 wrote:

As discussed f2f, it is hard to isolate dereferences of a pointer from other usages. Rust also considers this as a usage. It keeps the analysis simple and reliable. Happy to reconsider in the future if there is need for more precision.

https://github.com/llvm/llvm-project/pull/159991