1 files changed, 30 insertions, 0 deletions
diff --git a/third_party/rust/futures-util/src/io/seek.rs b/third_party/rust/futures-util/src/io/seek.rs
new file mode 100644
index 0000000000..0aa2371393
--- /dev/null
+++ b/third_party/rust/futures-util/src/io/seek.rs
@@ -0,0 +1,30 @@
+use crate::io::{AsyncSeek, SeekFrom};
+use futures_core::future::Future;
+use futures_core::task::{Context, Poll};
+use std::io;
+use std::pin::Pin;
+
+/// Future for the [`seek`](crate::io::AsyncSeekExt::seek) method.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct Seek<'a, S: ?Sized> {
+    seek: &'a mut S,
+    pos: SeekFrom,
+}
+
+impl<S: ?Sized + Unpin> Unpin for Seek<'_, S> {}
+
+impl<'a, S: AsyncSeek + ?Sized + Unpin> Seek<'a, S> {
+    pub(super) fn new(seek: &'a mut S, pos: SeekFrom) -> Self {
+        Self { seek, pos }
+    }
+}
+
+impl<S: AsyncSeek + ?Sized + Unpin> Future for Seek<'_, S> {
+    type Output = io::Result<u64>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let this = &mut *self;
+        Pin::new(&mut this.seek).poll_seek(cx, this.pos)
+    }
+}