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-rw-r--r--tests/ui/generics/generic-object.rs21
1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/generics/generic-object.rs b/tests/ui/generics/generic-object.rs
new file mode 100644
index 000000000..851424a11
--- /dev/null
+++ b/tests/ui/generics/generic-object.rs
@@ -0,0 +1,21 @@
+// run-pass
+
+trait Foo<T> {
+ fn get(&self) -> T;
+}
+
+struct S {
+ x: isize
+}
+
+impl Foo<isize> for S {
+ fn get(&self) -> isize {
+ self.x
+ }
+}
+
+pub fn main() {
+ let x = Box::new(S { x: 1 });
+ let y = x as Box<dyn Foo<isize>>;
+ assert_eq!(y.get(), 1);
+}