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-rw-r--r--library/std/src/collections/hash/map.rs7
-rw-r--r--library/std/src/collections/hash/set.rs2
-rw-r--r--library/std/src/ffi/c_str.rs8
-rw-r--r--library/std/src/ffi/os_str.rs3
-rw-r--r--library/std/src/fs.rs2
-rw-r--r--library/std/src/io/buffered/bufreader.rs11
-rw-r--r--library/std/src/io/buffered/bufwriter.rs1
-rw-r--r--library/std/src/io/error.rs1
-rw-r--r--library/std/src/io/mod.rs1
-rw-r--r--library/std/src/io/stdio.rs1
-rw-r--r--library/std/src/lazy.rs1
-rw-r--r--library/std/src/net/addr.rs3
-rw-r--r--library/std/src/net/ip.rs2
-rw-r--r--library/std/src/net/tcp.rs1
-rw-r--r--library/std/src/os/unix/net/ancillary.rs1
-rw-r--r--library/std/src/path.rs5
-rw-r--r--library/std/src/sync/barrier.rs1
-rw-r--r--library/std/src/sync/condvar.rs1
-rw-r--r--library/std/src/sync/once.rs1
-rw-r--r--library/std/src/sys/windows/fs.rs4
-rw-r--r--library/std/src/sys/windows/stack_overflow.rs8
-rw-r--r--library/std/src/sys_common/backtrace.rs6
22 files changed, 54 insertions, 17 deletions
diff --git a/library/std/src/collections/hash/map.rs b/library/std/src/collections/hash/map.rs
index 528bb1bf6e9..01019344f4f 100644
--- a/library/std/src/collections/hash/map.rs
+++ b/library/std/src/collections/hash/map.rs
@@ -223,6 +223,7 @@ impl<K, V> HashMap<K, V, RandomState> {
     /// let mut map: HashMap<&str, i32> = HashMap::new();
     /// ```
     #[inline]
+    #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new() -> HashMap<K, V, RandomState> {
         Default::default()
@@ -240,6 +241,7 @@ impl<K, V> HashMap<K, V, RandomState> {
     /// let mut map: HashMap<&str, i32> = HashMap::with_capacity(10);
     /// ```
     #[inline]
+    #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn with_capacity(capacity: usize) -> HashMap<K, V, RandomState> {
         HashMap::with_capacity_and_hasher(capacity, Default::default())
@@ -1720,6 +1722,7 @@ impl<'a, K, V, S> RawOccupiedEntryMut<'a, K, V, S> {
     /// Converts the entry into a mutable reference to the key in the entry
     /// with a lifetime bound to the map itself.
     #[inline]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[unstable(feature = "hash_raw_entry", issue = "56167")]
     pub fn into_key(self) -> &'a mut K {
         self.base.into_key()
@@ -1735,6 +1738,7 @@ impl<'a, K, V, S> RawOccupiedEntryMut<'a, K, V, S> {
     /// Converts the `OccupiedEntry` into a mutable reference to the value in the entry
     /// with a lifetime bound to the map itself.
     #[inline]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[unstable(feature = "hash_raw_entry", issue = "56167")]
     pub fn into_mut(self) -> &'a mut V {
         self.base.into_mut()
@@ -1764,6 +1768,7 @@ impl<'a, K, V, S> RawOccupiedEntryMut<'a, K, V, S> {
     /// Converts the `OccupiedEntry` into a mutable reference to the key and value in the entry
     /// with a lifetime bound to the map itself.
     #[inline]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[unstable(feature = "hash_raw_entry", issue = "56167")]
     pub fn into_key_value(self) -> (&'a mut K, &'a mut V) {
         self.base.into_key_value()
@@ -2891,6 +2896,7 @@ impl RandomState {
     #[inline]
     #[allow(deprecated)]
     // rand
+    #[must_use]
     #[stable(feature = "hashmap_build_hasher", since = "1.7.0")]
     pub fn new() -> RandomState {
         // Historically this function did not cache keys from the OS and instead
@@ -2943,6 +2949,7 @@ impl DefaultHasher {
     /// instances created through `new` or `default`.
     #[stable(feature = "hashmap_default_hasher", since = "1.13.0")]
     #[allow(deprecated)]
+    #[must_use]
     pub fn new() -> DefaultHasher {
         DefaultHasher(SipHasher13::new_with_keys(0, 0))
     }
diff --git a/library/std/src/collections/hash/set.rs b/library/std/src/collections/hash/set.rs
index dcfe3220950..5804701892e 100644
--- a/library/std/src/collections/hash/set.rs
+++ b/library/std/src/collections/hash/set.rs
@@ -126,6 +126,7 @@ impl<T> HashSet<T, RandomState> {
     /// let set: HashSet<i32> = HashSet::new();
     /// ```
     #[inline]
+    #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new() -> HashSet<T, RandomState> {
         Default::default()
@@ -144,6 +145,7 @@ impl<T> HashSet<T, RandomState> {
     /// assert!(set.capacity() >= 10);
     /// ```
     #[inline]
+    #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn with_capacity(capacity: usize) -> HashSet<T, RandomState> {
         HashSet { base: base::HashSet::with_capacity_and_hasher(capacity, Default::default()) }
diff --git a/library/std/src/ffi/c_str.rs b/library/std/src/ffi/c_str.rs
index fe1f28f00c4..6b488e49ed7 100644
--- a/library/std/src/ffi/c_str.rs
+++ b/library/std/src/ffi/c_str.rs
@@ -322,6 +322,7 @@ impl FromVecWithNulError {
     ///
     /// assert_eq!(bytes, value.unwrap_err().into_bytes());
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     pub fn into_bytes(self) -> Vec<u8> {
         self.bytes
     }
@@ -524,6 +525,7 @@ impl CString {
     /// }
     /// ```
     #[inline]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "cstr_memory", since = "1.4.0")]
     pub fn into_raw(self) -> *mut c_char {
         Box::into_raw(self.into_inner()) as *mut c_char
@@ -547,7 +549,6 @@ impl CString {
     /// let err = cstring.into_string().err().expect("into_string().err() failed");
     /// assert_eq!(err.utf8_error().valid_up_to(), 1);
     /// ```
-
     #[stable(feature = "cstring_into", since = "1.7.0")]
     pub fn into_string(self) -> Result<String, IntoStringError> {
         String::from_utf8(self.into_bytes()).map_err(|e| IntoStringError {
@@ -571,6 +572,7 @@ impl CString {
     /// let bytes = c_string.into_bytes();
     /// assert_eq!(bytes, vec![b'f', b'o', b'o']);
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "cstring_into", since = "1.7.0")]
     pub fn into_bytes(self) -> Vec<u8> {
         let mut vec = self.into_inner().into_vec();
@@ -591,6 +593,7 @@ impl CString {
     /// let bytes = c_string.into_bytes_with_nul();
     /// assert_eq!(bytes, vec![b'f', b'o', b'o', b'\0']);
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "cstring_into", since = "1.7.0")]
     pub fn into_bytes_with_nul(self) -> Vec<u8> {
         self.into_inner().into_vec()
@@ -667,6 +670,7 @@ impl CString {
     /// assert_eq!(&*boxed,
     ///            CStr::from_bytes_with_nul(b"foo\0").expect("CStr::from_bytes_with_nul failed"));
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "into_boxed_c_str", since = "1.20.0")]
     pub fn into_boxed_c_str(self) -> Box<CStr> {
         unsafe { Box::from_raw(Box::into_raw(self.into_inner()) as *mut CStr) }
@@ -1018,6 +1022,7 @@ impl NulError {
     /// let nul_error = CString::new("foo\0bar").unwrap_err();
     /// assert_eq!(nul_error.into_vec(), b"foo\0bar");
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn into_vec(self) -> Vec<u8> {
         self.1
@@ -1092,6 +1097,7 @@ impl fmt::Display for FromVecWithNulError {
 impl IntoStringError {
     /// Consumes this error, returning original [`CString`] which generated the
     /// error.
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "cstring_into", since = "1.7.0")]
     pub fn into_cstring(self) -> CString {
         self.inner
diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
index c305519dd44..de745f21649 100644
--- a/library/std/src/ffi/os_str.rs
+++ b/library/std/src/ffi/os_str.rs
@@ -119,6 +119,7 @@ impl OsString {
     /// let os_string = OsString::new();
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[inline]
     pub fn new() -> OsString {
         OsString { inner: Buf::from_string(String::new()) }
@@ -199,6 +200,7 @@ impl OsString {
     /// assert_eq!(capacity, os_string.capacity());
     /// ```
     #[stable(feature = "osstring_simple_functions", since = "1.9.0")]
+    #[must_use]
     #[inline]
     pub fn with_capacity(capacity: usize) -> OsString {
         OsString { inner: Buf::with_capacity(capacity) }
@@ -346,6 +348,7 @@ impl OsString {
     ///
     /// let b: Box<OsStr> = s.into_boxed_os_str();
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "into_boxed_os_str", since = "1.20.0")]
     pub fn into_boxed_os_str(self) -> Box<OsStr> {
         let rw = Box::into_raw(self.inner.into_box()) as *mut OsStr;
diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index 726c855c4fd..85d35072923 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -744,6 +744,7 @@ impl OpenOptions {
     /// let file = options.read(true).open("foo.txt");
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn new() -> Self {
         OpenOptions(fs_imp::OpenOptions::new())
     }
@@ -2184,6 +2185,7 @@ impl DirBuilder {
     /// let builder = DirBuilder::new();
     /// ```
     #[stable(feature = "dir_builder", since = "1.6.0")]
+    #[must_use]
     pub fn new() -> DirBuilder {
         DirBuilder { inner: fs_imp::DirBuilder::new(), recursive: false }
     }
diff --git a/library/std/src/io/buffered/bufreader.rs b/library/std/src/io/buffered/bufreader.rs
index 243207a6065..2864e94f60f 100644
--- a/library/std/src/io/buffered/bufreader.rs
+++ b/library/std/src/io/buffered/bufreader.rs
@@ -242,14 +242,13 @@ impl<R: Seek> BufReader<R> {
                 self.pos = new_pos as usize;
                 return Ok(());
             }
-        } else {
-            if let Some(new_pos) = pos.checked_add(offset as u64) {
-                if new_pos <= self.cap as u64 {
-                    self.pos = new_pos as usize;
-                    return Ok(());
-                }
+        } else if let Some(new_pos) = pos.checked_add(offset as u64) {
+            if new_pos <= self.cap as u64 {
+                self.pos = new_pos as usize;
+                return Ok(());
             }
         }
+
         self.seek(SeekFrom::Current(offset)).map(drop)
     }
 }
diff --git a/library/std/src/io/buffered/bufwriter.rs b/library/std/src/io/buffered/bufwriter.rs
index ebbda7c1bf2..c7423e4d92a 100644
--- a/library/std/src/io/buffered/bufwriter.rs
+++ b/library/std/src/io/buffered/bufwriter.rs
@@ -476,6 +476,7 @@ pub struct WriterPanicked {
 impl WriterPanicked {
     /// Returns the perhaps-unwritten data.  Some of this data may have been written by the
     /// panicking call(s) to the underlying writer, so simply writing it again is not a good idea.
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "bufwriter_into_parts", since = "1.56.0")]
     pub fn into_inner(self) -> Vec<u8> {
         self.buf
diff --git a/library/std/src/io/error.rs b/library/std/src/io/error.rs
index 51666c0a3c7..6101260e149 100644
--- a/library/std/src/io/error.rs
+++ b/library/std/src/io/error.rs
@@ -657,6 +657,7 @@ impl Error {
     /// }
     /// ```
     #[stable(feature = "io_error_inner", since = "1.3.0")]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[inline]
     pub fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>> {
         match self.repr {
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 8c71138aa23..abe29ba0f7c 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -1206,6 +1206,7 @@ impl<'a> IoSlice<'a> {
     ///
     /// Panics on Windows if the slice is larger than 4GB.
     #[stable(feature = "iovec", since = "1.36.0")]
+    #[must_use]
     #[inline]
     pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
         IoSlice(sys::io::IoSlice::new(buf))
diff --git a/library/std/src/io/stdio.rs b/library/std/src/io/stdio.rs
index 1ac3bbc95c6..9389501e012 100644
--- a/library/std/src/io/stdio.rs
+++ b/library/std/src/io/stdio.rs
@@ -464,6 +464,7 @@ impl Stdin {
     ///     println!("got a line: {}", line.unwrap());
     /// }
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[unstable(feature = "stdin_forwarders", issue = "87096")]
     pub fn lines(self) -> Lines<StdinLock<'static>> {
         self.into_locked().lines()
diff --git a/library/std/src/lazy.rs b/library/std/src/lazy.rs
index 5afdb799f0c..d7450962359 100644
--- a/library/std/src/lazy.rs
+++ b/library/std/src/lazy.rs
@@ -171,6 +171,7 @@ impl<T: Eq> Eq for SyncOnceCell<T> {}
 impl<T> SyncOnceCell<T> {
     /// Creates a new empty cell.
     #[unstable(feature = "once_cell", issue = "74465")]
+    #[must_use]
     pub const fn new() -> SyncOnceCell<T> {
         SyncOnceCell {
             once: Once::new(),
diff --git a/library/std/src/net/addr.rs b/library/std/src/net/addr.rs
index f4ebcd53a25..cd2007cc2cb 100644
--- a/library/std/src/net/addr.rs
+++ b/library/std/src/net/addr.rs
@@ -131,6 +131,7 @@ impl SocketAddr {
     /// assert_eq!(socket.port(), 8080);
     /// ```
     #[stable(feature = "ip_addr", since = "1.7.0")]
+    #[must_use]
     pub fn new(ip: IpAddr, port: u16) -> SocketAddr {
         match ip {
             IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
@@ -272,6 +273,7 @@ impl SocketAddrV4 {
     /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
         SocketAddrV4 {
             inner: c::sockaddr_in {
@@ -368,6 +370,7 @@ impl SocketAddrV6 {
     /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV6 {
         SocketAddrV6 {
             inner: c::sockaddr_in6 {
diff --git a/library/std/src/net/ip.rs b/library/std/src/net/ip.rs
index c05a32742ba..99922eef61f 100644
--- a/library/std/src/net/ip.rs
+++ b/library/std/src/net/ip.rs
@@ -442,6 +442,7 @@ impl Ipv4Addr {
     /// ```
     #[rustc_const_stable(feature = "const_ipv4", since = "1.32.0")]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[inline]
     pub const fn new(a: u8, b: u8, c: u8, d: u8) -> Ipv4Addr {
         // `s_addr` is stored as BE on all machine and the array is in BE order.
@@ -1192,6 +1193,7 @@ impl Ipv6Addr {
     /// ```
     #[rustc_const_stable(feature = "const_ipv6", since = "1.32.0")]
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[inline]
     pub const fn new(a: u16, b: u16, c: u16, d: u16, e: u16, f: u16, g: u16, h: u16) -> Ipv6Addr {
         let addr16 = [
diff --git a/library/std/src/net/tcp.rs b/library/std/src/net/tcp.rs
index 223726d45d7..2c6e3930059 100644
--- a/library/std/src/net/tcp.rs
+++ b/library/std/src/net/tcp.rs
@@ -883,6 +883,7 @@ impl TcpListener {
     ///     Ok(())
     /// }
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[unstable(feature = "tcplistener_into_incoming", issue = "88339")]
     pub fn into_incoming(self) -> IntoIncoming {
         IntoIncoming { listener: self }
diff --git a/library/std/src/os/unix/net/ancillary.rs b/library/std/src/os/unix/net/ancillary.rs
index 1f9d42812ec..57bb61903c1 100644
--- a/library/std/src/os/unix/net/ancillary.rs
+++ b/library/std/src/os/unix/net/ancillary.rs
@@ -189,6 +189,7 @@ impl SocketCred {
     ///
     /// PID, UID and GID is set to 0.
     #[unstable(feature = "unix_socket_ancillary_data", issue = "76915")]
+    #[must_use]
     pub fn new() -> SocketCred {
         SocketCred(libc::ucred { pid: 0, uid: 0, gid: 0 })
     }
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index a45ecf6ea8c..a8a79fb9c8f 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -532,6 +532,7 @@ impl<'a> Component<'a> {
     /// let components: Vec<_> = path.components().map(|comp| comp.as_os_str()).collect();
     /// assert_eq!(&components, &[".", "tmp", "foo", "bar.txt"]);
     /// ```
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn as_os_str(self) -> &'a OsStr {
         match self {
@@ -1145,6 +1146,7 @@ impl PathBuf {
     /// let path = PathBuf::new();
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     #[inline]
     pub fn new() -> PathBuf {
         PathBuf { inner: OsString::new() }
@@ -1169,6 +1171,7 @@ impl PathBuf {
     ///
     /// [`with_capacity`]: OsString::with_capacity
     #[stable(feature = "path_buf_capacity", since = "1.44.0")]
+    #[must_use]
     #[inline]
     pub fn with_capacity(capacity: usize) -> PathBuf {
         PathBuf { inner: OsString::with_capacity(capacity) }
@@ -1428,6 +1431,7 @@ impl PathBuf {
     /// let os_str = p.into_os_string();
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[inline]
     pub fn into_os_string(self) -> OsString {
         self.inner
@@ -1435,6 +1439,7 @@ impl PathBuf {
 
     /// Converts this `PathBuf` into a [boxed](Box) [`Path`].
     #[stable(feature = "into_boxed_path", since = "1.20.0")]
+    #[must_use = "`self` will be dropped if the result is not used"]
     #[inline]
     pub fn into_boxed_path(self) -> Box<Path> {
         let rw = Box::into_raw(self.inner.into_boxed_os_str()) as *mut Path;
diff --git a/library/std/src/sync/barrier.rs b/library/std/src/sync/barrier.rs
index a17b82f82e8..0e28a2d166f 100644
--- a/library/std/src/sync/barrier.rs
+++ b/library/std/src/sync/barrier.rs
@@ -80,6 +80,7 @@ impl Barrier {
     /// let barrier = Barrier::new(10);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn new(n: usize) -> Barrier {
         Barrier {
             lock: Mutex::new(BarrierState { count: 0, generation_id: 0 }),
diff --git a/library/std/src/sync/condvar.rs b/library/std/src/sync/condvar.rs
index 00a4afc5705..d8aca9651b8 100644
--- a/library/std/src/sync/condvar.rs
+++ b/library/std/src/sync/condvar.rs
@@ -121,6 +121,7 @@ impl Condvar {
     /// let condvar = Condvar::new();
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn new() -> Condvar {
         Condvar { inner: sys::Condvar::new() }
     }
diff --git a/library/std/src/sync/once.rs b/library/std/src/sync/once.rs
index a2e935a0ceb..1710c005393 100644
--- a/library/std/src/sync/once.rs
+++ b/library/std/src/sync/once.rs
@@ -186,6 +186,7 @@ impl Once {
     #[inline]
     #[stable(feature = "once_new", since = "1.2.0")]
     #[rustc_const_stable(feature = "const_once_new", since = "1.32.0")]
+    #[must_use]
     pub const fn new() -> Once {
         Once { state_and_queue: AtomicUsize::new(INCOMPLETE), _marker: marker::PhantomData }
     }
diff --git a/library/std/src/sys/windows/fs.rs b/library/std/src/sys/windows/fs.rs
index cc137771bb8..ad550a823ae 100644
--- a/library/std/src/sys/windows/fs.rs
+++ b/library/std/src/sys/windows/fs.rs
@@ -558,7 +558,7 @@ impl IntoInner<Handle> for File {
 
 impl FromInner<Handle> for File {
     fn from_inner(handle: Handle) -> File {
-        File { handle: handle }
+        File { handle }
     }
 }
 
@@ -672,7 +672,7 @@ impl FilePermissions {
 
 impl FileType {
     fn new(attrs: c::DWORD, reparse_tag: c::DWORD) -> FileType {
-        FileType { attributes: attrs, reparse_tag: reparse_tag }
+        FileType { attributes: attrs, reparse_tag }
     }
     pub fn is_dir(&self) -> bool {
         !self.is_symlink() && self.is_directory()
diff --git a/library/std/src/sys/windows/stack_overflow.rs b/library/std/src/sys/windows/stack_overflow.rs
index 755dc0a6c8b..18a2a36ad25 100644
--- a/library/std/src/sys/windows/stack_overflow.rs
+++ b/library/std/src/sys/windows/stack_overflow.rs
@@ -9,10 +9,10 @@ impl Handler {
     pub unsafe fn new() -> Handler {
         // This API isn't available on XP, so don't panic in that case and just
         // pray it works out ok.
-        if c::SetThreadStackGuarantee(&mut 0x5000) == 0 {
-            if c::GetLastError() as u32 != c::ERROR_CALL_NOT_IMPLEMENTED as u32 {
-                panic!("failed to reserve stack space for exception handling");
-            }
+        if c::SetThreadStackGuarantee(&mut 0x5000) == 0
+            && c::GetLastError() as u32 != c::ERROR_CALL_NOT_IMPLEMENTED as u32
+        {
+            panic!("failed to reserve stack space for exception handling");
         }
         Handler
     }
diff --git a/library/std/src/sys_common/backtrace.rs b/library/std/src/sys_common/backtrace.rs
index e6a099f0e81..d5e8f12414f 100644
--- a/library/std/src/sys_common/backtrace.rs
+++ b/library/std/src/sys_common/backtrace.rs
@@ -93,10 +93,8 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
         if stop {
             return false;
         }
-        if !hit {
-            if start {
-                res = bt_fmt.frame().print_raw(frame.ip(), None, None, None);
-            }
+        if !hit && start {
+            res = bt_fmt.frame().print_raw(frame.ip(), None, None, None);
         }
 
         idx += 1;
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2025-12-07 00:09:11 +0000