Vendor dependencies

Let's see how I like this workflow.

vendor/tokio/tests/task_builder.rs

@@ -0,0 +1,81 @@
+#[cfg(all(tokio_unstable, feature = "tracing"))]
+mod tests {
+    use std::rc::Rc;
+    use tokio::{
+        task::{Builder, LocalSet},
+        test,
+    };
+
+    #[test]
+    async fn spawn_with_name() {
+        let result = Builder::new()
+            .name("name")
+            .spawn(async { "task executed" })
+            .unwrap()
+            .await;
+
+        assert_eq!(result.unwrap(), "task executed");
+    }
+
+    #[test]
+    async fn spawn_blocking_with_name() {
+        let result = Builder::new()
+            .name("name")
+            .spawn_blocking(|| "task executed")
+            .unwrap()
+            .await;
+
+        assert_eq!(result.unwrap(), "task executed");
+    }
+
+    #[test]
+    async fn spawn_local_with_name() {
+        let unsend_data = Rc::new("task executed");
+        let result = LocalSet::new()
+            .run_until(async move {
+                Builder::new()
+                    .name("name")
+                    .spawn_local(async move { unsend_data })
+                    .unwrap()
+                    .await
+            })
+            .await;
+
+        assert_eq!(*result.unwrap(), "task executed");
+    }
+
+    #[test]
+    async fn spawn_without_name() {
+        let result = Builder::new()
+            .spawn(async { "task executed" })
+            .unwrap()
+            .await;
+
+        assert_eq!(result.unwrap(), "task executed");
+    }
+
+    #[test]
+    async fn spawn_blocking_without_name() {
+        let result = Builder::new()
+            .spawn_blocking(|| "task executed")
+            .unwrap()
+            .await;
+
+        assert_eq!(result.unwrap(), "task executed");
+    }
+
+    #[test]
+    async fn spawn_local_without_name() {
+        let unsend_data = Rc::new("task executed");
+        let result = LocalSet::new()
+            .run_until(async move {
+                Builder::new()
+                    .spawn_local(async move { unsend_data })
+                    .unwrap()
+                    .await
+            })
+            .await;
+
+        assert_eq!(*result.unwrap(), "task executed");
+    }
+}