Remove stable attribute from wasi fs (read_exact|write_all)_at)

Author: paolobarbolini

library/std/src/os/wasi/fs.rs

@@ -72,7 +72,6 @@ pub trait FileExt {
     /// If this function returns an error, it is unspecified how many bytes it
     /// has read, but it will never read more than would be necessary to
     /// completely fill the buffer.
-    #[stable(feature = "rw_exact_all_at", since = "1.33.0")]
     fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> io::Result<()> {
         while !buf.is_empty() {
             match self.read_at(buf, offset) {
@@ -144,7 +143,6 @@ pub trait FileExt {
     /// non-[`io::ErrorKind::Interrupted`] kind that [`write_at`] returns.
     ///
     /// [`write_at`]: FileExt::write_at
-    #[stable(feature = "rw_exact_all_at", since = "1.33.0")]
     fn write_all_at(&self, mut buf: &[u8], mut offset: u64) -> io::Result<()> {
         while !buf.is_empty() {
             match self.write_at(buf, offset) {