const param in async

1 files changed, 35 insertions, 0 deletions

diff --git a/src/test/ui/const-generics/const-param-in-async.rs b/src/test/ui/const-generics/const-param-in-async.rs
new file mode 100644
index 00000000000..e8601985287
--- /dev/null
+++ b/src/test/ui/const-generics/const-param-in-async.rs
@@ -0,0 +1,35 @@
+// edition:2018
+// check-pass
+// revisions: full min
+#![cfg_attr(full, feature(const_generics))]
+#![cfg_attr(full, allow(incomplete_features))]
+#![cfg_attr(min, feature(min_const_generics))]
+
+async fn foo<const N: usize>(arg: [u8; N]) -> usize { arg.len() }
+
+async fn bar<const N: usize>() -> [u8; N] {
+    [0; N]
+}
+
+trait Trait<const N: usize> {
+    fn fynn(&self) -> usize;
+}
+impl<const N: usize> Trait<N> for [u8; N] {
+    fn fynn(&self) -> usize {
+        N
+    }
+}
+async fn baz<const N: usize>() -> impl Trait<N> {
+    [0; N]
+}
+
+async fn biz<const N: usize>(v: impl Trait<N>) -> usize {
+    v.fynn()
+}
+
+async fn user<const N: usize>() {
+    let _ = foo::<N>(bar().await).await;
+    let _ = biz(baz::<N>().await).await;
+}
+
+fn main() { }