Fix compilation errors

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

Author: NobodyXu

library/std/src/io/mod.rs

@@ -338,7 +338,8 @@ pub(crate) mod copy;
 mod cursor;
 mod error;
 mod impls;
-#[unstable(feature = "annoymous_pipe", issue = "")]
+/// Annoymous pipe implementation
+#[unstable(feature = "annoymous_pipe", issue = "127154")]
 pub mod pipe;
 pub mod prelude;
 mod stdio;

library/std/src/io/pipe/mod.rs

@@ -12,12 +12,16 @@ pub fn pipe() -> io::Result<(PipeReader, PipeWriter)> {
     }
 }
 
+/// Read end of the annoymous pipe.
 #[derive(Debug)]
 pub struct PipeReader(AnonPipe);
 
+/// Write end of the annoymous pipe.
 #[derive(Debug)]
 pub struct PipeWriter(AnonPipe);
 
+/// The owned fd provided is not a pipe.
+#[derive(Debug)]
 pub struct NotAPipeError;
 
 impl PipeReader {
@@ -174,7 +178,7 @@ mod windows {
 
     #[inline]
     pub(super) fn pipe() -> io::Result<(PipeReader, PipeWriter)> {
-        anon_pipe(true, false).map(|Pipes { ours, their }| (PipeReader(ours), PipeWrite(theirs)))
+        anon_pipe(true, false).map(|Pipes { ours, theirs }| (PipeReader(ours), PipeWriter(theirs)))
     }
 
     macro_rules! impl_traits {