Add regression test for rust-lang#90752

Author: ecstatic-morse

src/test/ui/drop/issue-90752.rs

@@ -0,0 +1,32 @@
+// run-pass
+
+use std::cell::RefCell;
+
+struct S<'a>(i32, &'a RefCell<Vec<i32>>);
+
+impl<'a> Drop for S<'a> {
+    fn drop(&mut self) {
+        self.1.borrow_mut().push(self.0);
+    }
+}
+
+fn test(drops: &RefCell<Vec<i32>>) {
+    let mut foo = None;
+    match foo {
+        None => (),
+        _ => return,
+    }
+
+    *(&mut foo) = Some((S(0, drops), S(1, drops))); // Both S(0) and S(1) should be dropped
+
+    match foo {
+        Some((_x, _)) => {}
+        _ => {}
+    }
+}
+
+fn main() {
+    let drops = RefCell::new(Vec::new());
+    test(&drops);
+    assert_eq!(*drops.borrow(), &[0, 1]);
+}