Auto merge of rust-lang#120375 - matthiaskrgr:rollup-ueakvms, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#117420 (Make `#![allow_internal_unstable(..)]` work with `stmt_expr_attributes`)
 - rust-lang#117678 (Stabilize `slice_group_by`)
 - rust-lang#119917 (Remove special-case handling of `vec.split_off(0)`)
 - rust-lang#120117 (Update `std::io::Error::downcast` return type)
 - rust-lang#120329 (RFC 3349 precursors)
 - rust-lang#120339 (privacy: Refactor top-level visiting in `NamePrivacyVisitor`)
 - rust-lang#120345 (Clippy subtree update)
 - rust-lang#120360 (Don't fire `OPAQUE_HIDDEN_INFERRED_BOUND` on sized return of AFIT)
 - rust-lang#120372 (Fix outdated comment on Box)

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

Author: bors

Cargo.lock

@@ -596,11 +596,11 @@ dependencies = [
 name = "clippy_dev"
 version = "0.0.1"
 dependencies = [
- "aho-corasick 0.7.20",
+ "aho-corasick 1.0.2",
  "clap",
  "indoc",
  "itertools",
- "opener 0.5.2",
+ "opener",
  "shell-escape",
  "walkdir",
 ]
@@ -610,7 +610,7 @@ name = "clippy_lints"
 version = "0.1.77"
 dependencies = [
  "arrayvec",
- "cargo_metadata 0.15.4",
+ "cargo_metadata 0.18.0",
  "clippy_config",
  "clippy_utils",
  "declare_clippy_lint",
@@ -2351,7 +2351,7 @@ dependencies = [
  "log",
  "memchr",
  "once_cell",
- "opener 0.6.1",
+ "opener",
  "pathdiff",
  "pulldown-cmark",
  "regex",
@@ -2626,16 +2626,6 @@ version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
-[[package]]
-name = "opener"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "293c15678e37254c15bd2f092314abb4e51d7fdde05c2021279c12631b54f005"
-dependencies = [
- "bstr",
- "winapi",
-]
-
 [[package]]
 name = "opener"
 version = "0.6.1"

compiler/rustc_ast/src/util/literal.rs

@@ -3,8 +3,7 @@
 use crate::ast::{self, LitKind, MetaItemLit, StrStyle};
 use crate::token::{self, Token};
 use rustc_lexer::unescape::{
-    byte_from_char, unescape_byte, unescape_c_string, unescape_char, unescape_literal, CStrUnit,
-    Mode,
+    byte_from_char, unescape_byte, unescape_char, unescape_mixed, unescape_unicode, MixedUnit, Mode,
 };
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::Span;
@@ -48,6 +47,9 @@ impl LitKind {
             return Err(LitError::InvalidSuffix);
         }
 
+        // For byte/char/string literals, chars and escapes have already been
+        // checked in the lexer (in `cook_lexer_literal`). So we can assume all
+        // chars and escapes are valid here.
         Ok(match kind {
             token::Bool => {
                 assert!(symbol.is_bool_lit());
@@ -56,12 +58,12 @@ impl LitKind {
             token::Byte => {
                 return unescape_byte(symbol.as_str())
                     .map(LitKind::Byte)
-                    .map_err(|_| LitError::LexerError);
+                    .map_err(|_| panic!("failed to unescape byte literal"));
             }
             token::Char => {
                 return unescape_char(symbol.as_str())
                     .map(LitKind::Char)
-                    .map_err(|_| LitError::LexerError);
+                    .map_err(|_| panic!("failed to unescape char literal"));
             }
 
             // There are some valid suffixes for integer and float literals,
@@ -77,113 +79,69 @@ impl LitKind {
                 let s = symbol.as_str();
                 // Vanilla strings are so common we optimize for the common case where no chars
                 // requiring special behaviour are present.
-                let symbol = if s.contains(['\\', '\r']) {
+                let symbol = if s.contains('\\') {
                     let mut buf = String::with_capacity(s.len());
-                    let mut error = Ok(());
                     // Force-inlining here is aggressive but the closure is
-                    // called on every char in the string, so it can be
-                    // hot in programs with many long strings.
-                    unescape_literal(
+                    // called on every char in the string, so it can be hot in
+                    // programs with many long strings containing escapes.
+                    unescape_unicode(
                         s,
                         Mode::Str,
                         &mut #[inline(always)]
-                        |_, unescaped_char| match unescaped_char {
+                        |_, c| match c {
                             Ok(c) => buf.push(c),
                             Err(err) => {
-                                if err.is_fatal() {
-                                    error = Err(LitError::LexerError);
-                                }
+                                assert!(!err.is_fatal(), "failed to unescape string literal")
                             }
                         },
                     );
-                    error?;
                     Symbol::intern(&buf)
                 } else {
                     symbol
                 };
                 LitKind::Str(symbol, ast::StrStyle::Cooked)
             }
             token::StrRaw(n) => {
-                // Raw strings have no escapes, so we only need to check for invalid chars, and we
-                // can reuse the symbol on success.
-                let mut error = Ok(());
-                unescape_literal(symbol.as_str(), Mode::RawStr, &mut |_, unescaped_char| {
-                    match unescaped_char {
-                        Ok(_) => {}
-                        Err(err) => {
-                            if err.is_fatal() {
-                                error = Err(LitError::LexerError);
-                            }
-                        }
-                    }
-                });
-                error?;
+                // Raw strings have no escapes so no work is needed here.
                 LitKind::Str(symbol, ast::StrStyle::Raw(n))
             }
             token::ByteStr => {
                 let s = symbol.as_str();
                 let mut buf = Vec::with_capacity(s.len());
-                let mut error = Ok(());
-                unescape_literal(s, Mode::ByteStr, &mut |_, c| match c {
+                unescape_unicode(s, Mode::ByteStr, &mut |_, c| match c {
                     Ok(c) => buf.push(byte_from_char(c)),
                     Err(err) => {
-                        if err.is_fatal() {
-                            error = Err(LitError::LexerError);
-                        }
+                        assert!(!err.is_fatal(), "failed to unescape string literal")
                     }
                 });
-                error?;
                 LitKind::ByteStr(buf.into(), StrStyle::Cooked)
             }
             token::ByteStrRaw(n) => {
-                // Raw strings have no escapes, so we only need to check for invalid chars, and we
-                // can convert the symbol directly to a `Lrc<u8>` on success.
-                let s = symbol.as_str();
-                let mut error = Ok(());
-                unescape_literal(s, Mode::RawByteStr, &mut |_, c| match c {
-                    Ok(_) => {}
-                    Err(err) => {
-                        if err.is_fatal() {
-                            error = Err(LitError::LexerError);
-                        }
-                    }
-                });
-                LitKind::ByteStr(s.to_owned().into_bytes().into(), StrStyle::Raw(n))
+                // Raw strings have no escapes so we can convert the symbol
+                // directly to a `Lrc<u8>`.
+                let buf = symbol.as_str().to_owned().into_bytes();
+                LitKind::ByteStr(buf.into(), StrStyle::Raw(n))
             }
             token::CStr => {
                 let s = symbol.as_str();
                 let mut buf = Vec::with_capacity(s.len());
-                let mut error = Ok(());
-                unescape_c_string(s, Mode::CStr, &mut |_span, c| match c {
-                    Ok(CStrUnit::Byte(b)) => buf.push(b),
-                    Ok(CStrUnit::Char(c)) => {
+                unescape_mixed(s, Mode::CStr, &mut |_span, c| match c {
+                    Ok(MixedUnit::Char(c)) => {
                         buf.extend_from_slice(c.encode_utf8(&mut [0; 4]).as_bytes())
                     }
+                    Ok(MixedUnit::HighByte(b)) => buf.push(b),
                     Err(err) => {
-                        if err.is_fatal() {
-                            error = Err(LitError::LexerError);
-                        }
+                        assert!(!err.is_fatal(), "failed to unescape C string literal")
                     }
                 });
-                error?;
                 buf.push(0);
                 LitKind::CStr(buf.into(), StrStyle::Cooked)
             }
             token::CStrRaw(n) => {
-                // Raw strings have no escapes, so we only need to check for invalid chars, and we
-                // can convert the symbol directly to a `Lrc<u8>` on success.
-                let s = symbol.as_str();
-                let mut error = Ok(());
-                unescape_c_string(s, Mode::RawCStr, &mut |_, c| match c {
-                    Ok(_) => {}
-                    Err(err) => {
-                        if err.is_fatal() {
-                            error = Err(LitError::LexerError);
-                        }
-                    }
-                });
-                error?;
-                let mut buf = s.to_owned().into_bytes();
+                // Raw strings have no escapes so we can convert the symbol
+                // directly to a `Lrc<u8>` after appending the terminating NUL
+                // char.
+                let mut buf = symbol.as_str().to_owned().into_bytes();
                 buf.push(0);
                 LitKind::CStr(buf.into(), StrStyle::Raw(n))
             }

compiler/rustc_codegen_cranelift/patches/0027-coretests-128bit-atomic-operations.patch

@@ -21,7 +21,7 @@ index 897a5e9..331f66f 100644
 -#![cfg_attr(target_has_atomic = "128", feature(integer_atomics))]
  #![cfg_attr(test, feature(cfg_match))]
  #![feature(int_roundings)]
- #![feature(slice_group_by)]
+ #![feature(split_array)]
 diff --git a/atomic.rs b/atomic.rs
 index b735957..ea728b6 100644
 --- a/atomic.rs

compiler/rustc_expand/src/config.rs

@@ -373,7 +373,9 @@ impl<'a> StripUnconfigured<'a> {
     /// If attributes are not allowed on expressions, emit an error for `attr`
     #[instrument(level = "trace", skip(self))]
     pub(crate) fn maybe_emit_expr_attr_err(&self, attr: &Attribute) {
-        if self.features.is_some_and(|features| !features.stmt_expr_attributes) {
+        if self.features.is_some_and(|features| !features.stmt_expr_attributes)
+            && !attr.span.allows_unstable(sym::stmt_expr_attributes)
+        {
             let mut err = feature_err(
                 &self.sess,
                 sym::stmt_expr_attributes,