Auto merge of #120365 - matthiaskrgr:rollup-ly2w0d5, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #107464 (Add `str::Lines::remainder`)
 - #118803 (Add the `min_exhaustive_patterns` feature gate)
 - #119466 (Initial implementation of `str::from_raw_parts[_mut]`)
 - #120053 (Specialize `Bytes` on `StdinLock<'_>`)
 - #120124 (Split assembly tests for ELF and MachO)
 - #120204 (Builtin macros effectively have implicit #[collapse_debuginfo(yes)])
 - #120322 (Don't manually resolve async closures in `rustc_resolve`)
 - #120356 (Fix broken markdown in csky-unknown-linux-gnuabiv2.md)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 10 insertions, 1 deletions

diff --git a/library/std/src/io/stdio.rs b/library/std/src/io/stdio.rs
index 05b21eeb40f..261b570dee7 100644
--- a/library/std/src/io/stdio.rs
+++ b/library/std/src/io/stdio.rs
@@ -8,7 +8,9 @@ use crate::io::prelude::*;
 use crate::cell::{Cell, RefCell};
 use crate::fmt;
 use crate::fs::File;
-use crate::io::{self, BorrowedCursor, BufReader, IoSlice, IoSliceMut, LineWriter, Lines};
+use crate::io::{
+    self, BorrowedCursor, BufReader, IoSlice, IoSliceMut, LineWriter, Lines, SpecReadByte,
+};
 use crate::sync::atomic::{AtomicBool, Ordering};
 use crate::sync::{Arc, Mutex, MutexGuard, OnceLock, ReentrantMutex, ReentrantMutexGuard};
 use crate::sys::stdio;
@@ -483,6 +485,13 @@ impl Read for StdinLock<'_> {
     }
 }
 
+impl SpecReadByte for StdinLock<'_> {
+    #[inline]
+    fn spec_read_byte(&mut self) -> Option<io::Result<u8>> {
+        BufReader::spec_read_byte(&mut *self.inner)
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl BufRead for StdinLock<'_> {
     fn fill_buf(&mut self) -> io::Result<&[u8]> {