Rollup merge of rust-lang#137062 - thaliaarchi:io-optional-methods/write, r=workingjubilee

Forward all default methods for I/O impls

Forward all default methods for `&mut T` and `Box<T>` to the inner `io::Read`, `io::Write`, `io::Seek`, and `io::BufRead` types.

Author: jhpratt

library/std/src/io/impls.rs

@@ -45,6 +45,7 @@ impl<R: Read + ?Sized> Read for &mut R {
     fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
         (**self).read_exact(buf)
     }
+
     #[inline]
     fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
         (**self).read_buf_exact(cursor)
@@ -77,6 +78,11 @@ impl<W: Write + ?Sized> Write for &mut W {
         (**self).write_all(buf)
     }
 
+    #[inline]
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        (**self).write_all_vectored(bufs)
+    }
+
     #[inline]
     fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
         (**self).write_fmt(fmt)
@@ -89,10 +95,25 @@ impl<S: Seek + ?Sized> Seek for &mut S {
         (**self).seek(pos)
     }
 
+    #[inline]
+    fn rewind(&mut self) -> io::Result<()> {
+        (**self).rewind()
+    }
+
+    #[inline]
+    fn stream_len(&mut self) -> io::Result<u64> {
+        (**self).stream_len()
+    }
+
     #[inline]
     fn stream_position(&mut self) -> io::Result<u64> {
         (**self).stream_position()
     }
+
+    #[inline]
+    fn seek_relative(&mut self, offset: i64) -> io::Result<()> {
+        (**self).seek_relative(offset)
+    }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<B: BufRead + ?Sized> BufRead for &mut B {
@@ -106,11 +127,21 @@ impl<B: BufRead + ?Sized> BufRead for &mut B {
         (**self).consume(amt)
     }
 
+    #[inline]
+    fn has_data_left(&mut self) -> io::Result<bool> {
+        (**self).has_data_left()
+    }
+
     #[inline]
     fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
         (**self).read_until(byte, buf)
     }
 
+    #[inline]
+    fn skip_until(&mut self, byte: u8) -> io::Result<usize> {
+        (**self).skip_until(byte)
+    }
+
     #[inline]
     fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
         (**self).read_line(buf)
@@ -153,6 +184,7 @@ impl<R: Read + ?Sized> Read for Box<R> {
     fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
         (**self).read_exact(buf)
     }
+
     #[inline]
     fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> io::Result<()> {
         (**self).read_buf_exact(cursor)
@@ -185,6 +217,11 @@ impl<W: Write + ?Sized> Write for Box<W> {
         (**self).write_all(buf)
     }
 
+    #[inline]
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        (**self).write_all_vectored(bufs)
+    }
+
     #[inline]
     fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
         (**self).write_fmt(fmt)
@@ -197,10 +234,25 @@ impl<S: Seek + ?Sized> Seek for Box<S> {
         (**self).seek(pos)
     }
 
+    #[inline]
+    fn rewind(&mut self) -> io::Result<()> {
+        (**self).rewind()
+    }
+
+    #[inline]
+    fn stream_len(&mut self) -> io::Result<u64> {
+        (**self).stream_len()
+    }
+
     #[inline]
     fn stream_position(&mut self) -> io::Result<u64> {
         (**self).stream_position()
     }
+
+    #[inline]
+    fn seek_relative(&mut self, offset: i64) -> io::Result<()> {
+        (**self).seek_relative(offset)
+    }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<B: BufRead + ?Sized> BufRead for Box<B> {
@@ -214,11 +266,21 @@ impl<B: BufRead + ?Sized> BufRead for Box<B> {
         (**self).consume(amt)
     }
 
+    #[inline]
+    fn has_data_left(&mut self) -> io::Result<bool> {
+        (**self).has_data_left()
+    }
+
     #[inline]
     fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
         (**self).read_until(byte, buf)
     }
 
+    #[inline]
+    fn skip_until(&mut self, byte: u8) -> io::Result<usize> {
+        (**self).skip_until(byte)
+    }
+
     #[inline]
     fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
         (**self).read_line(buf)