Auto merge of #91469 - matthiaskrgr:rollup-xom3j55, r=matthiaskrgr

Rollup of 12 pull requests

Successful merges:

 - #89954 (Fix legacy_const_generic doc arguments display)
 - #91321 (Handle placeholder regions in NLL type outlive constraints)
 - #91329 (Fix incorrect usage of `EvaluatedToOk` when evaluating `TypeOutlives`)
 - #91364 (Improve error message for incorrect field accesses through raw pointers)
 - #91387 (Clarify and tidy up explanation of E0038)
 - #91410 (Move `#![feature(const_precise_live_drops)]` checks earlier in the pipeline)
 - #91435 (Improve diagnostic for missing half of binary operator in `if` condition)
 - #91444 (disable tests in Miri that take too long)
 - #91457 (Add additional test from rust issue number 91068)
 - #91460 (Document how `last_os_error` should be used)
 - #91464 (Document file path case sensitivity)
 - #91466 (Improve the comments in `Symbol::interner`.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 14 insertions, 1 deletions

diff --git a/library/std/src/io/error.rs b/library/std/src/io/error.rs
index d93c6172cfc..da88c8c9261 100644
--- a/library/std/src/io/error.rs
+++ b/library/std/src/io/error.rs
@@ -440,12 +440,18 @@ impl Error {
     /// `GetLastError` on Windows) and will return a corresponding instance of
     /// [`Error`] for the error code.
     ///
+    /// This should be called immediately after a call to a platform function,
+    /// otherwise the state of the error value is indeterminate. In particular,
+    /// other standard library functions may call platform functions that may
+    /// (or may not) reset the error value even if they succeed.
+    ///
     /// # Examples
     ///
     /// ```
     /// use std::io::Error;
     ///
-    /// println!("last OS error: {:?}", Error::last_os_error());
+    /// let os_error = Error::last_os_error();
+    /// println!("last OS error: {:?}", os_error);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[must_use]
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index cf2cd5adc48..9ade2847e8e 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -12,6 +12,13 @@
 //! [`PathBuf`]; note that the paths may differ syntactically by the
 //! normalization described in the documentation for the [`components`] method.
 //!
+//! ## Case sensitivity
+//!
+//! Unless otherwise indicated path methods that do not access the filesystem,
+//! such as [`Path::starts_with`] and [`Path::ends_with`], are case sensitive no
+//! matter the platform or filesystem. An exception to this is made for Windows
+//! drive letters.
+//!
 //! ## Simple usage
 //!
 //! Path manipulation includes both parsing components from slices and building