Auto merge of #76964 - RalfJung:rollup-ybn06fs, r=RalfJung

Rollup of 15 pull requests

Successful merges:

 - #76722 (Test and fix Send and Sync traits of BTreeMap artefacts)
 - #76766 (Extract some intrinsics out of rustc_codegen_llvm)
 - #76800 (Don't generate bootstrap usage unless it's needed)
 - #76809 (simplfy condition in ItemLowerer::with_trait_impl_ref())
 - #76815 (Fix wording in mir doc)
 - #76818 (Don't compile regex at every function call.)
 - #76821 (Remove redundant nightly features)
 - #76823 (black_box: silence unused_mut warning when building with cfg(miri))
 - #76825 (use `array_windows` instead of `windows` in the compiler)
 - #76827 (fix array_windows docs)
 - #76828 (use strip_prefix over starts_with and manual slicing based on pattern length (clippy::manual_strip))
 - #76840 (Move to intra doc links in core/src/future)
 - #76845 (Use intra docs links in core::{ascii, option, str, pattern, hash::map})
 - #76853 (Use intra-doc links in library/core/src/task/wake.rs)
 - #76871 (support panic=abort in Miri)

Failed merges:

r? `@ghost`

1 files changed, 8 insertions, 4 deletions

diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index e38cd516b91..a730c303788 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -5,15 +5,14 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
+#![feature(array_windows)]
 #![feature(crate_visibility_modifier)]
 #![feature(const_fn)]
 #![feature(const_panic)]
 #![feature(negative_impls)]
 #![feature(nll)]
-#![feature(optin_builtin_traits)]
 #![feature(min_specialization)]
 #![feature(option_expect_none)]
-#![feature(refcell_take)]
 
 #[macro_use]
 extern crate rustc_macros;
@@ -1158,7 +1157,12 @@ impl<S: Encoder> Encodable<S> for SourceFile {
                     let max_line_length = if lines.len() == 1 {
                         0
                     } else {
-                        lines.windows(2).map(|w| w[1] - w[0]).map(|bp| bp.to_usize()).max().unwrap()
+                        lines
+                            .array_windows()
+                            .map(|&[fst, snd]| snd - fst)
+                            .map(|bp| bp.to_usize())
+                            .max()
+                            .unwrap()
                     };
 
                     let bytes_per_diff: u8 = match max_line_length {
@@ -1173,7 +1177,7 @@ impl<S: Encoder> Encodable<S> for SourceFile {
                     // Encode the first element.
                     lines[0].encode(s)?;
 
-                    let diff_iter = (&lines[..]).windows(2).map(|w| (w[1] - w[0]));
+                    let diff_iter = lines[..].array_windows().map(|&[fst, snd]| snd - fst);
 
                     match bytes_per_diff {
                         1 => {