Fix some #[cfg_attr(not(doc), repr(..))]

Now that rust-lang#90435 seems to have been resolved.

library/core/src/error.rs

@@ -506,7 +506,7 @@ where
 /// ```
 ///
 #[unstable(feature = "error_generic_member_access", issue = "99301")]
-#[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/90435
+#[repr(transparent)]
 pub struct Request<'a>(Tagged<dyn Erased<'a> + 'a>);
 
 impl<'a> Request<'a> {

library/core/src/ffi/c_str.rs

@@ -103,7 +103,7 @@ use crate::str;
 // However, `CStr` layout is considered an implementation detail and must not be relied upon. We
 // want `repr(transparent)` but we don't want it to show up in rustdoc, so we hide it under
 // `cfg(doc)`. This is an ad-hoc implementation of attribute privacy.
-#[cfg_attr(not(doc), repr(transparent))]
+#[repr(transparent)]
 #[allow(clippy::derived_hash_with_manual_eq)]
 pub struct CStr {
     // FIXME: this should not be represented with a DST slice but rather with

library/core/src/ffi/mod.rs

@@ -191,7 +191,7 @@ mod c_long_definition {
 //     be UB.
 #[doc = include_str!("c_void.md")]
 #[lang = "c_void"]
-#[cfg_attr(not(doc), repr(u8))] // work around https://github.com/rust-lang/rust/issues/90435
+#[cfg_attr(not(doc), repr(u8))] // An implementation detail we don't want to show up in rustdoc
 #[stable(feature = "core_c_void", since = "1.30.0")]
 pub enum c_void {
     #[unstable(

library/core/src/ffi/va_list.rs

@@ -23,7 +23,7 @@ use crate::ops::{Deref, DerefMut};
     target_os = "uefi",
     windows,
 ))]
-#[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/90435
+#[repr(transparent)]
 #[lang = "va_list"]
 pub struct VaListImpl<'f> {
     ptr: *mut c_void,
@@ -115,7 +115,7 @@ pub struct VaListImpl<'f> {
 }
 
 /// A wrapper for a `va_list`
-#[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/90435
+#[repr(transparent)]
 #[derive(Debug)]
 pub struct VaList<'a, 'f: 'a> {
     #[cfg(any(

library/core/src/task/wake.rs

@@ -429,7 +429,7 @@ impl<'a> ContextBuilder<'a> {
 /// [`Future::poll()`]: core::future::Future::poll
 /// [`Poll::Pending`]: core::task::Poll::Pending
 /// [`Wake`]: ../../alloc/task/trait.Wake.html
-#[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/66401
+#[repr(transparent)]
 #[stable(feature = "futures_api", since = "1.36.0")]
 pub struct Waker {
     waker: RawWaker,
@@ -695,7 +695,7 @@ impl fmt::Debug for Waker {
 /// [`Poll::Pending`]: core::task::Poll::Pending
 /// [`local_waker`]: core::task::Context::local_waker
 #[unstable(feature = "local_waker", issue = "118959")]
-#[cfg_attr(not(doc), repr(transparent))] // work around https://github.com/rust-lang/rust/issues/66401
+#[repr(transparent)]
 pub struct LocalWaker {
     waker: RawWaker,
 }

library/std/src/ffi/os_str.rs

@@ -115,10 +115,8 @@ impl crate::sealed::Sealed for OsString {}
 #[stable(feature = "rust1", since = "1.0.0")]
 // `OsStr::from_inner` current implementation relies
 // on `OsStr` being layout-compatible with `Slice`.
-// However, `OsStr` layout is considered an implementation detail and must not be relied upon. We
-// want `repr(transparent)` but we don't want it to show up in rustdoc, so we hide it under
-// `cfg(doc)`. This is an ad-hoc implementation of attribute privacy.
-#[cfg_attr(not(doc), repr(transparent))]
+// However, `OsStr` layout is considered an implementation detail and must not be relied upon.
+#[repr(transparent)]
 pub struct OsStr {
     inner: Slice,
 }

library/std/src/path.rs

@@ -2079,10 +2079,8 @@ impl AsRef<OsStr> for PathBuf {
 #[stable(feature = "rust1", since = "1.0.0")]
 // `Path::new` current implementation relies
 // on `Path` being layout-compatible with `OsStr`.
-// However, `Path` layout is considered an implementation detail and must not be relied upon. We
-// want `repr(transparent)` but we don't want it to show up in rustdoc, so we hide it under
-// `cfg(doc)`. This is an ad-hoc implementation of attribute privacy.
-#[cfg_attr(not(doc), repr(transparent))]
+// However, `Path` layout is considered an implementation detail and must not be relied upon.
+#[repr(transparent)]
 pub struct Path {
     inner: OsStr,
 }