diff --git a/library/std/src/sys/windows/c.rs b/library/std/src/sys/windows/c.rs
index 559c4dc9c7cd8..657421e3fa4cc 100644
--- a/library/std/src/sys/windows/c.rs
+++ b/library/std/src/sys/windows/c.rs
@@ -47,7 +47,6 @@ pub type LPWCH = *mut WCHAR;
 pub type LPWIN32_FIND_DATAW = *mut WIN32_FIND_DATAW;
 pub type LPWSADATA = *mut WSADATA;
 pub type LPWSAPROTOCOL_INFO = *mut WSAPROTOCOL_INFO;
-pub type LPSTR = *mut CHAR;
 pub type LPWSTR = *mut WCHAR;
 pub type LPFILETIME = *mut FILETIME;
 pub type LPWSABUF = *mut WSABUF;
@@ -876,16 +875,6 @@ extern "system" {
     pub fn DeleteFileW(lpPathName: LPCWSTR) -> BOOL;
     pub fn GetCurrentDirectoryW(nBufferLength: DWORD, lpBuffer: LPWSTR) -> DWORD;
     pub fn SetCurrentDirectoryW(lpPathName: LPCWSTR) -> BOOL;
-    pub fn WideCharToMultiByte(
-        CodePage: UINT,
-        dwFlags: DWORD,
-        lpWideCharStr: LPCWSTR,
-        cchWideChar: c_int,
-        lpMultiByteStr: LPSTR,
-        cbMultiByte: c_int,
-        lpDefaultChar: LPCSTR,
-        lpUsedDefaultChar: LPBOOL,
-    ) -> c_int;
 
     pub fn closesocket(socket: SOCKET) -> c_int;
     pub fn recv(socket: SOCKET, buf: *mut c_void, len: c_int, flags: c_int) -> c_int;
diff --git a/library/std/src/sys/windows/mod.rs b/library/std/src/sys/windows/mod.rs
index 8178e6806b9b3..8c19cc78b09cd 100644
--- a/library/std/src/sys/windows/mod.rs
+++ b/library/std/src/sys/windows/mod.rs
@@ -4,7 +4,6 @@ use crate::ffi::{OsStr, OsString};
 use crate::io::ErrorKind;
 use crate::os::windows::ffi::{OsStrExt, OsStringExt};
 use crate::path::PathBuf;
-use crate::ptr;
 use crate::time::Duration;
 
 pub use self::rand::hashmap_random_keys;
@@ -206,58 +205,6 @@ fn os2path(s: &[u16]) -> PathBuf {
     PathBuf::from(OsString::from_wide(s))
 }
 
-#[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
-fn wide_char_to_multi_byte(
-    code_page: u32,
-    flags: u32,
-    s: &[u16],
-    no_default_char: bool,
-) -> crate::io::Result<Vec<i8>> {
-    unsafe {
-        let mut size = c::WideCharToMultiByte(
-            code_page,
-            flags,
-            s.as_ptr(),
-            s.len() as i32,
-            ptr::null_mut(),
-            0,
-            ptr::null(),
-            ptr::null_mut(),
-        );
-        if size == 0 {
-            return Err(crate::io::Error::last_os_error());
-        }
-
-        let mut buf = Vec::with_capacity(size as usize);
-        buf.set_len(size as usize);
-
-        let mut used_default_char = c::FALSE;
-        size = c::WideCharToMultiByte(
-            code_page,
-            flags,
-            s.as_ptr(),
-            s.len() as i32,
-            buf.as_mut_ptr(),
-            buf.len() as i32,
-            ptr::null(),
-            if no_default_char { &mut used_default_char } else { ptr::null_mut() },
-        );
-        if size == 0 {
-            return Err(crate::io::Error::last_os_error());
-        }
-        if no_default_char && used_default_char == c::TRUE {
-            return Err(crate::io::Error::new(
-                crate::io::ErrorKind::InvalidData,
-                "string cannot be converted to requested code page",
-            ));
-        }
-
-        buf.set_len(size as usize);
-
-        Ok(buf)
-    }
-}
-
 pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
     match unrolled_find_u16s(0, v) {
         // don't include the 0
diff --git a/library/unwind/src/libunwind.rs b/library/unwind/src/libunwind.rs
index 806df572cf944..ff1d82fc99040 100644
--- a/library/unwind/src/libunwind.rs
+++ b/library/unwind/src/libunwind.rs
@@ -89,7 +89,7 @@ extern "C" {
 }
 
 cfg_if::cfg_if! {
-if #[cfg(all(any(target_os = "ios", target_os = "netbsd", not(target_arch = "arm"))))] {
+if #[cfg(any(target_os = "ios", target_os = "netbsd", not(target_arch = "arm")))] {
     // Not ARM EHABI
     #[repr(C)]
     #[derive(Copy, Clone, PartialEq)]