1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/self/object-safety-sized-self-by-value-self.rs b/src/test/ui/self/object-safety-sized-self-by-value-self.rs
new file mode 100644
index 000000000..43b1d8b91
--- /dev/null
+++ b/src/test/ui/self/object-safety-sized-self-by-value-self.rs
@@ -0,0 +1,39 @@
+// run-pass
+#![allow(unused_mut)]
+// Check that a trait is still object-safe (and usable) if it has
+// methods with by-value self so long as they require `Self : Sized`.
+
+
+trait Counter {
+    fn tick(&mut self) -> u32;
+    fn get(self) -> u32 where Self : Sized;
+}
+
+struct CCounter {
+    c: u32
+}
+
+impl Counter for CCounter {
+    fn tick(&mut self) -> u32 { self.c += 1; self.c }
+    fn get(self) -> u32 where Self : Sized { self.c }
+}
+
+fn tick1<C:Counter>(mut c: C) -> u32 {
+    tick2(&mut c);
+    c.get()
+}
+
+fn tick2(c: &mut dyn Counter) {
+    tick3(c);
+}
+
+fn tick3<C:?Sized+Counter>(c: &mut C) {
+    c.tick();
+    c.tick();
+}
+
+fn main() {
+    let mut c = CCounter { c: 0 };
+    let value = tick1(c);
+    assert_eq!(value, 2);
+}