Move regression test to module

Author: dtolnay

tests/test.rs

@@ -2,9 +2,6 @@
 
 use async_trait::async_trait;
 
-// Renaming to avoid masking missing absolute paths in generated code.
-use std::future::Future as StdFuture;
-
 #[async_trait]
 trait Trait {
     type Assoc;
@@ -120,14 +117,19 @@ pub async fn test_object_safe_with_default() {
 }
 
 // https://github.com/dtolnay/async-trait/issues/2
-#[async_trait]
-pub trait Issue2: StdFuture {
-    async fn flatten(self) -> <<Self as StdFuture>::Output as StdFuture>::Output
-    where
-        Self::Output: StdFuture + Send,
-        Self: Sized,
-    {
-        let nested_future = self.await;
-        nested_future.await
+mod issue2 {
+    use async_trait::async_trait;
+    use std::future::Future;
+
+    #[async_trait]
+    pub trait Issue2: Future {
+        async fn flatten(self) -> <<Self as Future>::Output as Future>::Output
+        where
+            Self::Output: Future + Send,
+            Self: Sized,
+        {
+            let nested_future = self.await;
+            nested_future.await
+        }
     }
 }