Use io::const_error! when possible over io::Error::new

Author: thaliaarchi

library/std/src/sys/net/connection/xous/tcplistener.rs

@@ -182,7 +182,7 @@ impl TcpListener {
 
     pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
         if ttl > 255 {
-            return Err(io::Error::new(io::ErrorKind::InvalidInput, "TTL must be less than 256"));
+            return Err(io::const_error!(io::ErrorKind::InvalidInput, "TTL must be less than 256"));
         }
         crate::os::xous::ffi::blocking_scalar(
             services::net_server(),

library/std/src/sys/net/connection/xous/tcpstream.rs

@@ -370,7 +370,7 @@ impl TcpStream {
 
     pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
         if ttl > 255 {
-            return Err(io::Error::new(io::ErrorKind::InvalidInput, "TTL must be less than 256"));
+            return Err(io::const_error!(io::ErrorKind::InvalidInput, "TTL must be less than 256"));
         }
         crate::os::xous::ffi::blocking_scalar(
             services::net_server(),

library/std/src/sys/net/connection/xous/udp.rs

@@ -360,7 +360,7 @@ impl UdpSocket {
 
     pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
         if ttl > 255 {
-            return Err(io::Error::new(io::ErrorKind::InvalidInput, "TTL must be less than 256"));
+            return Err(io::const_error!(io::ErrorKind::InvalidInput, "TTL must be less than 256"));
         }
         crate::os::xous::ffi::blocking_scalar(
             services::net_server(),

library/std/src/sys/pal/teeos/mod.rs

@@ -148,5 +148,5 @@ pub fn unsupported<T>() -> std_io::Result<T> {
 }
 
 pub fn unsupported_err() -> std_io::Error {
-    std_io::Error::new(std_io::ErrorKind::Unsupported, "operation not supported on this platform")
+    std_io::Error::UNSUPPORTED_PLATFORM
 }

library/std/src/sys/pal/teeos/os.rs

@@ -107,11 +107,11 @@ pub fn getenv(_: &OsStr) -> Option<OsString> {
 }
 
 pub unsafe fn setenv(_: &OsStr, _: &OsStr) -> io::Result<()> {
-    Err(io::Error::new(io::ErrorKind::Unsupported, "cannot set env vars on this platform"))
+    Err(io::const_error!(io::ErrorKind::Unsupported, "cannot set env vars on this platform"))
 }
 
 pub unsafe fn unsetenv(_: &OsStr) -> io::Result<()> {
-    Err(io::Error::new(io::ErrorKind::Unsupported, "cannot unset env vars on this platform"))
+    Err(io::const_error!(io::ErrorKind::Unsupported, "cannot unset env vars on this platform"))
 }
 
 pub fn temp_dir() -> PathBuf {

library/std/src/sys/pal/uefi/stdio.rs

@@ -71,7 +71,7 @@ impl io::Read for Stdin {
             };
 
         if ch.len() > 1 {
-            return Err(io::Error::new(io::ErrorKind::InvalidData, "invalid utf-16 sequence"));
+            return Err(io::const_error!(io::ErrorKind::InvalidData, "invalid utf-16 sequence"));
         }
 
         match ch.pop().unwrap() {

library/std/src/sys/pal/unix/process/process_unix.rs

@@ -1228,7 +1228,7 @@ mod linux_child_ext {
                 .as_ref()
                 // SAFETY: The os type is a transparent wrapper, therefore we can transmute references
                 .map(|fd| unsafe { mem::transmute::<&imp::PidFd, &os::PidFd>(fd) })
-                .ok_or_else(|| io::Error::new(ErrorKind::Uncategorized, "No pidfd was created."))
+                .ok_or_else(|| io::const_error!(ErrorKind::Uncategorized, "No pidfd was created."))
         }
 
         fn into_pidfd(mut self) -> Result<os::PidFd, Self> {

library/std/src/sys/pal/wasi/fs.rs

@@ -773,8 +773,7 @@ fn open_parent(p: &Path) -> io::Result<(ManuallyDrop<WasiFd>, PathBuf)> {
                     }
                     let msg = format!(
                         "failed to find a pre-opened file descriptor \
-                     through which {:?} could be opened",
-                        p
+                        through which {p:?} could be opened",
                     );
                     return Err(io::Error::new(io::ErrorKind::Uncategorized, msg));
                 }

library/test/src/formatters/junit.rs

@@ -39,15 +39,15 @@ fn str_to_cdata(s: &str) -> String {
 
 impl<T: Write> OutputFormatter for JunitFormatter<T> {
     fn write_discovery_start(&mut self) -> io::Result<()> {
-        Err(io::Error::new(io::ErrorKind::NotFound, "Not yet implemented!"))
+        Err(io::const_error!(io::ErrorKind::NotFound, "Not yet implemented!"))
     }
 
     fn write_test_discovered(&mut self, _desc: &TestDesc, _test_type: &str) -> io::Result<()> {
-        Err(io::Error::new(io::ErrorKind::NotFound, "Not yet implemented!"))
+        Err(io::const_error!(io::ErrorKind::NotFound, "Not yet implemented!"))
     }
 
     fn write_discovery_finish(&mut self, _state: &ConsoleTestDiscoveryState) -> io::Result<()> {
-        Err(io::Error::new(io::ErrorKind::NotFound, "Not yet implemented!"))
+        Err(io::const_error!(io::ErrorKind::NotFound, "Not yet implemented!"))
     }
 
     fn write_run_start(

library/test/src/lib.rs

@@ -20,6 +20,7 @@
 #![feature(rustdoc_internals)]
 #![feature(file_buffered)]
 #![feature(internal_output_capture)]
+#![feature(io_const_error)]
 #![feature(staged_api)]
 #![feature(process_exitcode_internals)]
 #![feature(panic_can_unwind)]

library/test/src/term/terminfo/mod.rs

@@ -90,7 +90,7 @@ impl TermInfo {
 
         get_dbpath_for_term(name)
             .ok_or_else(|| {
-                Error::IoError(io::Error::new(io::ErrorKind::NotFound, "terminfo file not found"))
+                Error::IoError(io::const_error!(io::ErrorKind::NotFound, "terminfo file not found"))
             })
             .and_then(|p| TermInfo::from_path(&(*p)))
     }

library/test/src/term/terminfo/parser/compiled.rs

@@ -173,7 +173,7 @@ fn read_le_u32(r: &mut dyn io::Read) -> io::Result<u32> {
 fn read_byte(r: &mut dyn io::Read) -> io::Result<u8> {
     match r.bytes().next() {
         Some(s) => s,
-        None => Err(io::Error::new(io::ErrorKind::Other, "end of file")),
+        None => Err(io::const_error!(io::ErrorKind::Other, "end of file")),
     }
 }