Add regression test for issue rust-lang#103476, fixed in edition 2024

Author: est31

tests/ui/rfcs/rfc-2497-if-let-chains/temporary-early-drop.rs

@@ -0,0 +1,25 @@
+// issue-103476
+//@ compile-flags: -Zlint-mir -Zunstable-options
+//@ edition: 2024
+//@ check-pass
+
+#![feature(let_chains)]
+#![allow(irrefutable_let_patterns)]
+
+struct Pd;
+
+impl Pd {
+    fn it(&self) -> It {
+        todo!()
+    }
+}
+
+pub struct It<'a>(Box<dyn Tr<'a>>);
+
+trait Tr<'a> {}
+
+fn f(m: Option<Pd>) {
+    if let Some(n) = m && let it = n.it() {};
+}
+
+fn main() {}