1 files changed, 33 insertions, 0 deletions
diff --git a/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs b/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs
new file mode 100644
index 000000000..7e9c5492d
--- /dev/null
+++ b/src/test/ui/suggestions/expected-boxed-future-isnt-pinned.rs
@@ -0,0 +1,33 @@
+// edition:2018
+#![allow(dead_code)]
+use std::future::Future;
+use std::pin::Pin;
+
+type BoxFuture<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;
+//   ^^^^^^^^^ This would come from the `futures` crate in real code.
+
+fn foo<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
+    // We could instead use an `async` block, but this way we have no std spans.
+    x //~ ERROR mismatched types
+}
+
+fn bar<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
+    Box::new(x) //~ ERROR mismatched types
+}
+
+fn baz<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
+    Pin::new(x) //~ ERROR mismatched types
+    //~^ ERROR E0277
+}
+
+fn qux<F: Future<Output=i32> + Send + 'static>(x: F) -> BoxFuture<'static, i32> {
+    Pin::new(Box::new(x)) //~ ERROR E0277
+}
+
+fn zap() -> BoxFuture<'static, i32> {
+    async { //~ ERROR mismatched types
+        42
+    }
+}
+
+fn main() {}