1 files changed, 108 insertions, 0 deletions
diff --git a/src/test/ui/traits/bound/in-arc.rs b/src/test/ui/traits/bound/in-arc.rs
new file mode 100644
index 000000000..a1492c0b9
--- /dev/null
+++ b/src/test/ui/traits/bound/in-arc.rs
@@ -0,0 +1,108 @@
+// run-pass
+#![allow(unused_must_use)]
+// Tests that a heterogeneous list of existential `dyn` types can be put inside an Arc
+// and shared between threads as long as all types fulfill Send.
+
+// ignore-emscripten no threads support
+
+use std::sync::Arc;
+use std::sync::mpsc::channel;
+use std::thread;
+
+trait Pet {
+    fn name(&self, blk: Box<dyn FnMut(&str)>);
+    fn num_legs(&self) -> usize;
+    fn of_good_pedigree(&self) -> bool;
+}
+
+struct Catte {
+    num_whiskers: usize,
+    name: String,
+}
+
+struct Dogge {
+    bark_decibels: usize,
+    tricks_known: usize,
+    name: String,
+}
+
+struct Goldfyshe {
+    swim_speed: usize,
+    name: String,
+}
+
+impl Pet for Catte {
+    fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) }
+    fn num_legs(&self) -> usize { 4 }
+    fn of_good_pedigree(&self) -> bool { self.num_whiskers >= 4 }
+}
+impl Pet for Dogge {
+    fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) }
+    fn num_legs(&self) -> usize { 4 }
+    fn of_good_pedigree(&self) -> bool {
+        self.bark_decibels < 70 || self.tricks_known > 20
+    }
+}
+impl Pet for Goldfyshe {
+    fn name(&self, mut blk: Box<dyn FnMut(&str)>) { blk(&self.name) }
+    fn num_legs(&self) -> usize { 0 }
+    fn of_good_pedigree(&self) -> bool { self.swim_speed >= 500 }
+}
+
+pub fn main() {
+    let catte = Catte { num_whiskers: 7, name: "alonzo_church".to_string() };
+    let dogge1 = Dogge {
+        bark_decibels: 100,
+        tricks_known: 42,
+        name: "alan_turing".to_string(),
+    };
+    let dogge2 = Dogge {
+        bark_decibels: 55,
+        tricks_known: 11,
+        name: "albert_einstein".to_string(),
+    };
+    let fishe = Goldfyshe {
+        swim_speed: 998,
+        name: "alec_guinness".to_string(),
+    };
+    let arc = Arc::new(vec![
+        Box::new(catte)  as Box<dyn Pet+Sync+Send>,
+        Box::new(dogge1) as Box<dyn Pet+Sync+Send>,
+        Box::new(fishe)  as Box<dyn Pet+Sync+Send>,
+        Box::new(dogge2) as Box<dyn Pet+Sync+Send>]);
+    let (tx1, rx1) = channel();
+    let arc1 = arc.clone();
+    let t1 = thread::spawn(move|| { check_legs(arc1); tx1.send(()); });
+    let (tx2, rx2) = channel();
+    let arc2 = arc.clone();
+    let t2 = thread::spawn(move|| { check_names(arc2); tx2.send(()); });
+    let (tx3, rx3) = channel();
+    let arc3 = arc.clone();
+    let t3 = thread::spawn(move|| { check_pedigree(arc3); tx3.send(()); });
+    rx1.recv();
+    rx2.recv();
+    rx3.recv();
+    t1.join();
+    t2.join();
+    t3.join();
+}
+
+fn check_legs(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) {
+    let mut legs = 0;
+    for pet in arc.iter() {
+        legs += pet.num_legs();
+    }
+    assert!(legs == 12);
+}
+fn check_names(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) {
+    for pet in arc.iter() {
+        pet.name(Box::new(|name| {
+            assert!(name.as_bytes()[0] == 'a' as u8 && name.as_bytes()[1] == 'l' as u8);
+        }))
+    }
+}
+fn check_pedigree(arc: Arc<Vec<Box<dyn Pet+Sync+Send>>>) {
+    for pet in arc.iter() {
+        assert!(pet.of_good_pedigree());
+    }
+}