Rollup merge of #153491 - ChrisDenton:openoptionsext2, r=Mark-Simulacrum

Move `freeze_*` methods to `OpenOptionsExt2`

Move the unstable `freeze_last_access_time` and `freeze_last_write_time` from `OpenOptionsExt` to a new `OpenOptionsExt2` trait. This should fix rust-lang/rust#153486.

library/std/src/os/windows/fs.rs

diff --git a/library/std/src/os/windows/fs.rs b/library/std/src/os/windows/fs.rs
index 73f3e58..7fd46b3 100644
--- a/library/std/src/os/windows/fs.rs
+++ b/library/std/src/os/windows/fs.rs
@@ -138,6 +138,8 @@ fn seek_write(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
 }
 
 /// Windows-specific extensions to [`fs::OpenOptions`].
+// WARNING: This trait is not sealed. DON'T add any new methods!
+// Add them to OpenOptionsExt2 instead.
 #[stable(feature = "open_options_ext", since = "1.10.0")]
 pub trait OpenOptionsExt {
     /// Overrides the `dwDesiredAccess` argument to the call to [`CreateFile`]
@@ -305,18 +307,6 @@ pub trait OpenOptionsExt {
     ///     https://docs.microsoft.com/en-us/windows/win32/api/winnt/ne-winnt-security_impersonation_level
     #[stable(feature = "open_options_ext", since = "1.10.0")]
     fn security_qos_flags(&mut self, flags: u32) -> &mut Self;
-
-    /// If set to `true`, prevent the "last access time" of the file from being changed.
-    ///
-    /// Default to `false`.
-    #[unstable(feature = "windows_freeze_file_times", issue = "149715")]
-    fn freeze_last_access_time(&mut self, freeze: bool) -> &mut Self;
-
-    /// If set to `true`, prevent the "last write time" of the file from being changed.
-    ///
-    /// Default to `false`.
-    #[unstable(feature = "windows_freeze_file_times", issue = "149715")]
-    fn freeze_last_write_time(&mut self, freeze: bool) -> &mut Self;
 }
 
 #[stable(feature = "open_options_ext", since = "1.10.0")]
@@ -345,7 +335,28 @@ fn security_qos_flags(&mut self, flags: u32) -> &mut OpenOptions {
         self.as_inner_mut().security_qos_flags(flags);
         self
     }
+}
 
+#[unstable(feature = "windows_freeze_file_times", issue = "149715")]
+pub trait OpenOptionsExt2: Sealed {
+    /// If set to `true`, prevent the "last access time" of the file from being changed.
+    ///
+    /// Default to `false`.
+    #[unstable(feature = "windows_freeze_file_times", issue = "149715")]
+    fn freeze_last_access_time(&mut self, freeze: bool) -> &mut Self;
+
+    /// If set to `true`, prevent the "last write time" of the file from being changed.
+    ///
+    /// Default to `false`.
+    #[unstable(feature = "windows_freeze_file_times", issue = "149715")]
+    fn freeze_last_write_time(&mut self, freeze: bool) -> &mut Self;
+}
+
+#[unstable(feature = "sealed", issue = "none")]
+impl Sealed for OpenOptions {}
+
+#[unstable(feature = "windows_freeze_file_times", issue = "149715")]
+impl OpenOptionsExt2 for OpenOptions {
     fn freeze_last_access_time(&mut self, freeze: bool) -> &mut Self {
         self.as_inner_mut().freeze_last_access_time(freeze);
         self