--- /dev/null
+#![feature(generators)]
+
+// run-pass
+
+use std::mem::size_of_val;
+
+fn main() {
+ // Generator taking a `Copy`able resume arg.
+ let gen_copy = |mut x: usize| {
+ loop {
+ drop(x);
+ x = yield;
+ }
+ };
+
+ // Generator taking a non-`Copy` resume arg.
+ let gen_move = |mut x: Box<usize>| {
+ loop {
+ drop(x);
+ x = yield;
+ }
+ };
+
+ // Neither of these generators have the resume arg live across the `yield`, so they should be
+ // 4 Bytes in size (only storing the discriminant)
+ assert_eq!(size_of_val(&gen_copy), 4);
+ assert_eq!(size_of_val(&gen_move), 4);
+}