Add regression test for issue 288

Author: dtolnay

tests/test.rs

@@ -1705,3 +1705,24 @@ pub mod issue283 {
         }
     }
 }
+
+// https://github.com/dtolnay/async-trait/issues/288
+pub mod issue288 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f<#[cfg(any())] T: Send>(#[cfg(any())] t: T);
+        async fn g<#[cfg(all())] T: Send>(#[cfg(all())] t: T);
+    }
+
+    pub struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn f<#[cfg(any())] T: Send>(#[cfg(any())] t: T) {}
+        async fn g<#[cfg(all())] T: Send>(#[cfg(all())] t: T) {
+            let _ = t;
+        }
+    }
+}