questions: add QuestionsConverterAsyncForStream

lib/src/questions.rs

@@ -224,6 +224,24 @@ pub mod convert_async {
         }
     }
 
+    pub trait QuestionsConverterAsyncForStream<T>
+    where
+        T: Stream<Item = (String, Result<SourceQuestionsBatch, serde_json::Error>)>
+            + std::marker::Unpin,
+    {
+        fn converter(&mut self) -> QuestionsConverterAsync<&mut T>;
+    }
+
+    impl<T> QuestionsConverterAsyncForStream<T> for T
+    where
+        T: Stream<Item = (String, Result<SourceQuestionsBatch, serde_json::Error>)>
+            + std::marker::Unpin,
+    {
+        fn converter(&mut self) -> QuestionsConverterAsync<&mut T> {
+            QuestionsConverterAsync::from(self)
+        }
+    }
+
     impl<T> QuestionsConverterAsync<T>
     where
         T: Stream<Item = (String, Result<SourceQuestionsBatch, serde_json::Error>)>
@@ -267,7 +285,7 @@ pub mod convert_async {
             });
 
             pin_mut!(source);
-            let converter = QuestionsConverterAsync::from(source);
+            let converter = source.converter();
             let converter = converter.convert();
             let converted: Vec<_> = converter.collect().await;
             assert_yaml_snapshot!(converted, @r#"
@@ -292,7 +310,7 @@ pub mod convert_async {
     }
 }
 #[cfg(feature = "convert_async")]
-pub use convert_async::QuestionsConverterAsync;
+pub use convert_async::{QuestionsConverterAsync, QuestionsConverterAsyncForStream};
 
 #[cfg(test)]
 mod test {