Seal OsStr[ing] extension traits.

Author: m-ou-se

library/std/src/ffi/os_str.rs

@@ -76,6 +76,10 @@ pub struct OsString {
     inner: Buf,
 }
 
+/// Allows extension traits within `std`.
+#[unstable(feature = "sealed", issue = "none")]
+impl crate::sealed::Sealed for OsString {}
+
 /// Borrowed reference to an OS string (see [`OsString`]).
 ///
 /// This type represents a borrowed reference to a string in the operating system's preferred
@@ -100,6 +104,10 @@ pub struct OsStr {
     inner: Slice,
 }
 
+/// Allows extension traits within `std`.
+#[unstable(feature = "sealed", issue = "none")]
+impl crate::sealed::Sealed for OsStr {}
+
 impl OsString {
     /// Constructs a new empty `OsString`.
     ///

library/std/src/sys/windows/ext/ffi.rs

@@ -53,6 +53,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use crate::ffi::{OsStr, OsString};
+use crate::sealed::Sealed;
 use crate::sys::os_str::Buf;
 use crate::sys_common::wtf8::Wtf8Buf;
 use crate::sys_common::{AsInner, FromInner};
@@ -62,7 +63,7 @@ pub use crate::sys_common::wtf8::EncodeWide;
 
 /// Windows-specific extensions to [`OsString`].
 #[stable(feature = "rust1", since = "1.0.0")]
-pub trait OsStringExt {
+pub trait OsStringExt: Sealed {
     /// Creates an `OsString` from a potentially ill-formed UTF-16 slice of
     /// 16-bit code units.
     ///
@@ -93,7 +94,7 @@ impl OsStringExt for OsString {
 
 /// Windows-specific extensions to [`OsStr`].
 #[stable(feature = "rust1", since = "1.0.0")]
-pub trait OsStrExt {
+pub trait OsStrExt: Sealed {
     /// Re-encodes an `OsStr` as a wide character sequence, i.e., potentially
     /// ill-formed UTF-16.
     ///

library/std/src/sys_common/os_str_bytes.rs

@@ -6,6 +6,7 @@ use crate::ffi::{OsStr, OsString};
 use crate::fmt;
 use crate::mem;
 use crate::rc::Rc;
+use crate::sealed::Sealed;
 use crate::str;
 use crate::sync::Arc;
 use crate::sys_common::bytestring::debug_fmt_bytestring;
@@ -233,7 +234,7 @@ impl Slice {
 
 /// Platform-specific extensions to [`OsString`].
 #[stable(feature = "rust1", since = "1.0.0")]
-pub trait OsStringExt {
+pub trait OsStringExt: Sealed {
     /// Creates an [`OsString`] from a byte vector.
     ///
     /// See the module documentation for an example.
@@ -259,7 +260,7 @@ impl OsStringExt for OsString {
 
 /// Platform-specific extensions to [`OsStr`].
 #[stable(feature = "rust1", since = "1.0.0")]
-pub trait OsStrExt {
+pub trait OsStrExt: Sealed {
     #[stable(feature = "rust1", since = "1.0.0")]
     /// Creates an [`OsStr`] from a byte slice.
     ///