Vendor dependencies

Let's see how I like this workflow.

vendor/tokio/tests/io_panic.rs

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+#![warn(rust_2018_idioms)]
+#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery
+
+use std::task::{Context, Poll};
+use std::{error::Error, pin::Pin};
+use tokio::io::{self, split, AsyncRead, AsyncWrite, ReadBuf};
+
+mod support {
+    pub mod panic;
+}
+use support::panic::test_panic;
+
+struct RW;
+
+impl AsyncRead for RW {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        buf.put_slice(&[b'z']);
+        Poll::Ready(Ok(()))
+    }
+}
+
+impl AsyncWrite for RW {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+        _buf: &[u8],
+    ) -> Poll<Result<usize, io::Error>> {
+        Poll::Ready(Ok(1))
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
+        Poll::Ready(Ok(()))
+    }
+}
+
+#[cfg(unix)]
+mod unix {
+    use std::os::unix::prelude::{AsRawFd, RawFd};
+
+    pub struct MockFd;
+
+    impl AsRawFd for MockFd {
+        fn as_raw_fd(&self) -> RawFd {
+            0
+        }
+    }
+}
+
+#[test]
+fn read_buf_initialize_unfilled_to_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let mut buffer = Vec::<u8>::new();
+        let mut read_buf = ReadBuf::new(&mut buffer);
+
+        read_buf.initialize_unfilled_to(2);
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn read_buf_advance_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let mut buffer = Vec::<u8>::new();
+        let mut read_buf = ReadBuf::new(&mut buffer);
+
+        read_buf.advance(2);
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn read_buf_set_filled_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let mut buffer = Vec::<u8>::new();
+        let mut read_buf = ReadBuf::new(&mut buffer);
+
+        read_buf.set_filled(2);
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn read_buf_put_slice_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let mut buffer = Vec::<u8>::new();
+        let mut read_buf = ReadBuf::new(&mut buffer);
+
+        let new_slice = [0x40_u8, 0x41_u8];
+
+        read_buf.put_slice(&new_slice);
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+fn unsplit_panic_caller() -> Result<(), Box<dyn Error>> {
+    let panic_location_file = test_panic(|| {
+        let (r1, _w1) = split(RW);
+        let (_r2, w2) = split(RW);
+        r1.unsplit(w2);
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+#[cfg(unix)]
+fn async_fd_new_panic_caller() -> Result<(), Box<dyn Error>> {
+    use tokio::io::unix::AsyncFd;
+    use tokio::runtime::Builder;
+
+    let panic_location_file = test_panic(|| {
+        // Runtime without `enable_io` so it has no IO driver set.
+        let rt = Builder::new_current_thread().build().unwrap();
+        rt.block_on(async {
+            let fd = unix::MockFd;
+
+            let _ = AsyncFd::new(fd);
+        });
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}
+
+#[test]
+#[cfg(unix)]
+fn async_fd_with_interest_panic_caller() -> Result<(), Box<dyn Error>> {
+    use tokio::io::unix::AsyncFd;
+    use tokio::io::Interest;
+    use tokio::runtime::Builder;
+
+    let panic_location_file = test_panic(|| {
+        // Runtime without `enable_io` so it has no IO driver set.
+        let rt = Builder::new_current_thread().build().unwrap();
+        rt.block_on(async {
+            let fd = unix::MockFd;
+
+            let _ = AsyncFd::with_interest(fd, Interest::READABLE);
+        });
+    });
+
+    // The panic location should be in this file
+    assert_eq!(&panic_location_file.unwrap(), file!());
+
+    Ok(())
+}