Vendor dependencies

Let's see how I like this workflow.

vendor/tokio/tests/rt_panic.rs

@@ -0,0 +1,77 @@
+#![warn(rust_2018_idioms)]
+#![cfg(feature = "full")]
+#![cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery
+
+use futures::future;
+use std::error::Error;
+use tokio::runtime::{Builder, Handle, Runtime};
+
+mod support {
+    pub mod panic;
+}
+use support::panic::test_panic;
+
+#[test]
+fn current_handle_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let _ = Handle::current();
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn into_panic_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(move || {
+        let rt = current_thread();
+        rt.block_on(async {
+            let handle = tokio::spawn(future::pending::<()>());
+
+            handle.abort();
+
+            let err = handle.await.unwrap_err();
+            assert!(!&err.is_panic());
+
+            let _ = err.into_panic();
+        });
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn builder_worker_threads_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let _ = Builder::new_multi_thread().worker_threads(0).build();
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn builder_max_blocking_threads_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let _ = Builder::new_multi_thread().max_blocking_threads(0).build();
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+fn current_thread() -> Runtime {
+    tokio::runtime::Builder::new_current_thread()
+        .enable_all()
+        .build()
+        .unwrap()
+}