Rollup merge of #141289 - compiler-errors:more-self, r=jhpratt

use `Self` alias in self types rather than manually substituting it

Of the rougly 145 uses of `self: Ty` in the standard library, 5 of them don't use `Self` but instead choose to manually "substitute" the `impl`'s self type into the type.

This leads to weird behavior sometimes (https://github.com/rust-lang/rust/issues/140611#issuecomment-2883761300) -- **to be clear**, none of these usages actually trigger any bugs, but it's possible that they may break in the future (or at least lead to lints), so let's just "fix" them proactively.

1 files changed, 1 insertions, 1 deletions

diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
index 72bdf03ee61..ead48775127 100644
--- a/library/std/src/ffi/os_str.rs
+++ b/library/std/src/ffi/os_str.rs
@@ -1040,7 +1040,7 @@ impl OsStr {
     /// Converts a <code>[Box]<[OsStr]></code> into an [`OsString`] without copying or allocating.
     #[stable(feature = "into_boxed_os_str", since = "1.20.0")]
     #[must_use = "`self` will be dropped if the result is not used"]
-    pub fn into_os_string(self: Box<OsStr>) -> OsString {
+    pub fn into_os_string(self: Box<Self>) -> OsString {
         let boxed = unsafe { Box::from_raw(Box::into_raw(self) as *mut Slice) };
         OsString { inner: Buf::from_box(boxed) }
     }