use proper unsupported

Author: chenyukang

library/std/src/sys/fs/solid.rs

@@ -539,14 +539,11 @@ pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> {
 }
 
 pub fn set_times(_p: &Path, _times: FileTimes) -> io::Result<()> {
-    Err(io::const_error!(io::ErrorKind::Unsupported, "setting file times not supported",))
+    unsupported()
 }
 
 pub fn set_times_nofollow(_p: &Path, _times: FileTimes) -> io::Result<()> {
-    Err(io::const_error!(
-        io::ErrorKind::Unsupported,
-        "setting file times on symlinks not supported",
-    ))
+    unsupported()
 }
 
 pub fn rmdir(p: &Path) -> io::Result<()> {

library/std/src/sys/fs/unix.rs

@@ -1201,6 +1201,7 @@ impl fmt::Debug for OpenOptions {
     target_os = "horizon",
     target_os = "nuttx",
 )))]
+#[inline(always)]
 fn to_timespec(time: Option<SystemTime>) -> io::Result<libc::timespec> {
     match time {
         Some(time) if let Some(ts) = time.t.to_timespec() => Ok(ts),
@@ -1217,6 +1218,7 @@ fn to_timespec(time: Option<SystemTime>) -> io::Result<libc::timespec> {
 }
 
 #[cfg(target_vendor = "apple")]
+#[inline(always)]
 fn set_attrlist_with_times(
     times: &FileTimes,
 ) -> io::Result<(libc::attrlist, [mem::MaybeUninit<libc::timespec>; 3], usize)> {

library/std/src/sys/fs/unsupported.rs

@@ -309,7 +309,7 @@ pub fn rename(_old: &Path, _new: &Path) -> io::Result<()> {
 }
 
 pub fn set_perm(_p: &Path, perm: FilePermissions) -> io::Result<()> {
-    match perm.0 {}
+    unsupported()
 }
 
 pub fn set_times(_p: &Path, times: FileTimes) -> io::Result<()> {