Auto merge of #131111 - matthiaskrgr:rollup-n6do187, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - #130005 (Replace -Z default-hidden-visibility with -Z default-visibility)
 - #130229 (ptr::add/sub: do not claim equivalence with `offset(c as isize)`)
 - #130773 (Update Unicode escapes in `/library/core/src/char/methods.rs`)
 - #130933 (rustdoc: lists items that contain multiple paragraphs are more clear)

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

src/doc/unstable-book/src/compiler-flags/default-hidden-visibility.md

@@ -1,12 +0,0 @@
-# `default-hidden-visibility`
-
-The tracking issue for this feature is: https://github.com/rust-lang/compiler-team/issues/656
-
-------------------------
-
-This flag can be used to override the target's
-[`default_hidden_visibility`](https://doc.rust-lang.org/beta/nightly-rustc/rustc_target/spec/struct.TargetOptions.html#structfield.default_hidden_visibility)
-setting.
-Using `-Zdefault_hidden_visibility=yes` is roughly equivalent to Clang's
-[`-fvisibility=hidden`](https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fvisibility)
-cmdline flag.

src/doc/unstable-book/src/compiler-flags/default-visibility.md

@@ -0,0 +1,44 @@
+# `default-visibility`
+
+The tracking issue for this feature is: https://github.com/rust-lang/rust/issues/131090
+
+------------------------
+
+This flag can be used to override the target's
+[`default_visibility`](https://doc.rust-lang.org/beta/nightly-rustc/rustc_target/spec/struct.TargetOptions.html#structfield.default_visibility)
+setting.
+
+This option only affects building of shared objects and should have no effect on executables.
+
+Visibility an be set to one of three options:
+
+* protected
+* hidden
+* interposable
+
+## Hidden visibility
+
+Using `-Zdefault-visibility=hidden` is roughly equivalent to Clang's
+[`-fvisibility=hidden`](https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fvisibility)
+cmdline flag. Hidden symbols will not be exported from the created shared object, so cannot be
+referenced from other shared objects or from executables.
+
+## Protected visibility
+
+Using `-Zdefault-visibility=protected` will cause rust-mangled symbols to be emitted with
+"protected" visibility. This signals the compiler, the linker and the runtime linker that these
+symbols cannot be overridden by the executable or by other shared objects earlier in the load order.
+
+This will allow the compiler to emit direct references to symbols, which may improve performance. It
+also removes the need for these symbols to be resolved when a shared object built with this option
+is loaded.
+
+Using protected visibility when linking with GNU ld prior to 2.40 will result in linker errors when
+building for Linux. Other linkers such as LLD are not affected.
+
+## Interposable
+
+Using `-Zdefault-visibility=interposable` will cause symbols to be emitted with "default"
+visibility. On platforms that support it, this makes it so that symbols can be interposed, which
+means that they can be overridden by symbols with the same name from the executable or by other
+shared objects earier in the load order.

src/librustdoc/html/static/css/rustdoc.css

@@ -960,6 +960,13 @@ pre, .rustdoc.src .example-wrap, .example-wrap .src-line-numbers {
 	display: inline-block;
 }
 
+.docblock li {
+	margin-bottom: .8em;
+}
+.docblock li p {
+	margin-bottom: .1em;
+}
+
 /* "where ..." clauses with block display are also smaller */
 div.where {
 	white-space: pre-wrap;