fix review notes

Signed-off-by: onur-ozkan <[email protected]>

Author: onur-ozkan

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -2200,12 +2200,10 @@ impl<D: Decoder> Decodable<D> for EncodedMetadata {
         let len = d.read_usize();
         let mmap = if len > 0 {
             let mut mmap = MmapMut::map_anon(len).unwrap();
-            let mut num_bytes = 0;
             for _ in 0..len {
-                num_bytes += (&mut mmap[..]).write(&[d.read_u8()]).unwrap();
+                (&mut mmap[..]).write_all(&[d.read_u8()]).unwrap();
             }
             mmap.flush().unwrap();
-            debug_assert!(len == num_bytes);
             Some(mmap.make_read_only().unwrap())
         } else {
             None

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -671,11 +671,11 @@ pub fn read_target_uint(endianness: Endian, mut source: &[u8]) -> Result<u128, i
     // So we do not read exactly 16 bytes into the u128, just the "payload".
     let uint = match endianness {
         Endian::Little => {
-            let _ = source.read(&mut buf)?;
+            source.read_exact(&mut buf)?;
             Ok(u128::from_le_bytes(buf))
         }
         Endian::Big => {
-            let _ = source.read(&mut buf[16 - source.len()..])?;
+            source.read_exact(&mut buf[16 - source.len()..])?;
             Ok(u128::from_be_bytes(buf))
         }
     };

compiler/stable_mir/src/mir/alloc.rs

@@ -57,11 +57,11 @@ pub(crate) fn read_target_uint(mut bytes: &[u8]) -> Result<u128, Error> {
     let mut buf = [0u8; std::mem::size_of::<u128>()];
     match MachineInfo::target_endianess() {
         Endian::Little => {
-            let _ = bytes.read(&mut buf)?;
+            bytes.read_exact(&mut buf)?;
             Ok(u128::from_le_bytes(buf))
         }
         Endian::Big => {
-            let _ = bytes.read(&mut buf[16 - bytes.len()..])?;
+            bytes.read_exact(&mut buf[16 - bytes.len()..])?;
             Ok(u128::from_be_bytes(buf))
         }
     }
@@ -72,11 +72,11 @@ pub(crate) fn read_target_int(mut bytes: &[u8]) -> Result<i128, Error> {
     let mut buf = [0u8; std::mem::size_of::<i128>()];
     match MachineInfo::target_endianess() {
         Endian::Little => {
-            let _ = bytes.read(&mut buf)?;
+            bytes.read_exact(&mut buf)?;
             Ok(i128::from_le_bytes(buf))
         }
         Endian::Big => {
-            let _ = bytes.read(&mut buf[16 - bytes.len()..])?;
+            bytes.read_exact(&mut buf[16 - bytes.len()..])?;
             Ok(i128::from_be_bytes(buf))
         }
     }