rustup; make sure the iterator moves even with smarter optimizations

rust-version

@@ -1 +1 @@
-7bdb5dee7bac15458b10b148e9e24968e633053e
+a3bc0e752fad96f537b73f4e9bc805a73d404f7b

tests/compile-fail/generator-pinned-moved.rs

@@ -34,10 +34,10 @@ where
 
 fn main() {
     let mut generator_iterator_2 = {
-        let mut generator_iterator = GeneratorIteratorAdapter(firstn());
+        let mut generator_iterator = Box::new(GeneratorIteratorAdapter(firstn()));
         generator_iterator.next(); // pin it
 
-        generator_iterator // move it
+        Box::new(*generator_iterator) // move it
     }; // *deallocate* generator_iterator
 
     generator_iterator_2.next(); // and use moved value