Auto merge of #126446 - workingjubilee:rollup-esdbgdw, r=workingjubilee

Rollup of 8 pull requests

Successful merges:

 - #121216 (Always emit `native-static-libs` note, even if it is empty)
 - #123726 (Clarify `Command::new` behavior for programs with arguments)
 - #125722 (Indicate in `non_local_defs` lint that the macro needs to change)
 - #126088 ([1/2] clean-up / general improvements)
 - #126390 (Fix wording in {checked_}next_power_of_two)
 - #126392 (Small style improvement in `gvn.rs`)
 - #126402 (Fix wrong `assert_unsafe_precondition` message for `core::ptr::copy`)
 - #126445 (Remove failing GUI test to stop blocking CI until it is fixed)

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

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -1561,17 +1561,13 @@ fn print_native_static_libs(
     match out {
         OutFileName::Real(path) => {
             out.overwrite(&lib_args.join(" "), sess);
-            if !lib_args.is_empty() {
-                sess.dcx().emit_note(errors::StaticLibraryNativeArtifactsToFile { path });
-            }
+            sess.dcx().emit_note(errors::StaticLibraryNativeArtifactsToFile { path });
         }
         OutFileName::Stdout => {
-            if !lib_args.is_empty() {
-                sess.dcx().emit_note(errors::StaticLibraryNativeArtifacts);
-                // Prefix for greppability
-                // Note: This must not be translated as tools are allowed to depend on this exact string.
-                sess.dcx().note(format!("native-static-libs: {}", &lib_args.join(" ")));
-            }
+            sess.dcx().emit_note(errors::StaticLibraryNativeArtifacts);
+            // Prefix for greppability
+            // Note: This must not be translated as tools are allowed to depend on this exact string.
+            sess.dcx().note(format!("native-static-libs: {}", &lib_args.join(" ")));
         }
     }
 }

compiler/rustc_lint/messages.ftl

@@ -550,6 +550,7 @@ lint_non_local_definitions_impl = non-local `impl` definition, `impl` blocks sho
     .bounds = `impl` may be usable in bounds, etc. from outside the expression, which might e.g. make something constructible that previously wasn't, because it's still on a publicly-visible type
     .exception = items in an anonymous const item (`const _: () = {"{"} ... {"}"}`) are treated as in the same scope as the anonymous const's declaration
     .const_anon = use a const-anon item to suppress this lint
+    .macro_to_change = the {$macro_kind} `{$macro_to_change}` defines the non-local `impl`, and may need to be changed
 
 lint_non_local_definitions_impl_move_help =
     move the `impl` block outside of this {$body_kind_descr} {$depth ->

compiler/rustc_lint/src/lints.rs

@@ -1362,6 +1362,7 @@ pub enum NonLocalDefinitionsDiag {
         has_trait: bool,
         self_ty_str: String,
         of_trait_str: Option<String>,
+        macro_to_change: Option<(String, &'static str)>,
     },
     MacroRules {
         depth: u32,
@@ -1387,6 +1388,7 @@ impl<'a> LintDiagnostic<'a, ()> for NonLocalDefinitionsDiag {
                 has_trait,
                 self_ty_str,
                 of_trait_str,
+                macro_to_change,
             } => {
                 diag.primary_message(fluent::lint_non_local_definitions_impl);
                 diag.arg("depth", depth);
@@ -1397,6 +1399,15 @@ impl<'a> LintDiagnostic<'a, ()> for NonLocalDefinitionsDiag {
                     diag.arg("of_trait_str", of_trait_str);
                 }
 
+                if let Some((macro_to_change, macro_kind)) = macro_to_change {
+                    diag.arg("macro_to_change", macro_to_change);
+                    diag.arg("macro_kind", macro_kind);
+                    diag.note(fluent::lint_macro_to_change);
+                }
+                if let Some(cargo_update) = cargo_update {
+                    diag.subdiagnostic(&diag.dcx, cargo_update);
+                }
+
                 if has_trait {
                     diag.note(fluent::lint_bounds);
                     diag.note(fluent::lint_with_trait);
@@ -1422,9 +1433,6 @@ impl<'a> LintDiagnostic<'a, ()> for NonLocalDefinitionsDiag {
                     );
                 }
 
-                if let Some(cargo_update) = cargo_update {
-                    diag.subdiagnostic(&diag.dcx, cargo_update);
-                }
                 if let Some(const_anon) = const_anon {
                     diag.note(fluent::lint_exception);
                     if let Some(const_anon) = const_anon {

compiler/rustc_lint/src/non_local_def.rs

@@ -258,6 +258,13 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
                     Some((cx.tcx.def_span(parent), may_move))
                 };
 
+                let macro_to_change =
+                    if let ExpnKind::Macro(kind, name) = item.span.ctxt().outer_expn_data().kind {
+                        Some((name.to_string(), kind.descr()))
+                    } else {
+                        None
+                    };
+
                 cx.emit_span_lint(
                     NON_LOCAL_DEFINITIONS,
                     ms,
@@ -274,6 +281,7 @@ impl<'tcx> LateLintPass<'tcx> for NonLocalDefinitions {
                         move_to,
                         may_remove,
                         has_trait: impl_.of_trait.is_some(),
+                        macro_to_change,
                     },
                 )
             }

compiler/rustc_mir_transform/src/gvn.rs

@@ -330,8 +330,7 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
         let is_sized = !self.feature_unsized_locals
             || self.local_decls[local].ty.is_sized(self.tcx, self.param_env);
         if is_sized {
-            self.rev_locals.ensure_contains_elem(value, SmallVec::new);
-            self.rev_locals[value].push(local);
+            self.rev_locals.ensure_contains_elem(value, SmallVec::new).push(local);
         }
     }
 

library/core/src/intrinsics.rs

@@ -3043,8 +3043,7 @@ pub const unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
     unsafe {
         ub_checks::assert_unsafe_precondition!(
             check_language_ub,
-            "ptr::copy_nonoverlapping requires that both pointer arguments are aligned and non-null \
-            and the specified memory ranges do not overlap",
+            "ptr::copy requires that both pointer arguments are aligned and non-null",
             (
                 src: *const () = src as *const (),
                 dst: *mut () = dst as *mut (),

library/core/src/num/nonzero.rs

@@ -1059,7 +1059,7 @@ macro_rules! nonzero_integer_signedness_dependent_methods {
             unsafe { Self::new_unchecked(self.get().unchecked_add(other)) }
         }
 
-        /// Returns the smallest power of two greater than or equal to n.
+        /// Returns the smallest power of two greater than or equal to `self`.
         /// Checks for overflow and returns [`None`]
         /// if the next power of two is greater than the type’s maximum value.
         /// As a consequence, the result cannot wrap to zero.

library/core/src/num/uint_macros.rs

@@ -2830,7 +2830,7 @@ macro_rules! uint_impl {
         ///
         /// When return value overflows (i.e., `self > (1 << (N-1))` for type
         /// `uN`), it panics in debug mode and the return value is wrapped to 0 in
-        /// release mode (the only situation in which method can return 0).
+        /// release mode (the only situation in which this method can return 0).
         ///
         /// # Examples
         ///
@@ -2851,7 +2851,7 @@ macro_rules! uint_impl {
             self.one_less_than_next_power_of_two() + 1
         }
 
-        /// Returns the smallest power of two greater than or equal to `n`. If
+        /// Returns the smallest power of two greater than or equal to `self`. If
         /// the next power of two is greater than the type's maximum value,
         /// `None` is returned, otherwise the power of two is wrapped in `Some`.
         ///

library/std/src/process.rs

@@ -629,6 +629,25 @@ impl Command {
     ///     .spawn()
     ///     .expect("sh command failed to start");
     /// ```
+    ///
+    /// # Caveats
+    ///
+    /// [`Command::new`] is only intended to accept the path of the program. If you pass a program
+    /// path along with arguments like `Command::new("ls -l").spawn()`, it will try to search for
+    /// `ls -l` literally. The arguments need to be passed separately, such as via [`arg`] or
+    /// [`args`].
+    ///
+    /// ```no_run
+    /// use std::process::Command;
+    ///
+    /// Command::new("ls")
+    ///     .arg("-l") // arg passed separately
+    ///     .spawn()
+    ///     .expect("ls command failed to start");
+    /// ```
+    ///
+    /// [`arg`]: Self::arg
+    /// [`args`]: Self::args
     #[stable(feature = "process", since = "1.0.0")]
     pub fn new<S: AsRef<OsStr>>(program: S) -> Command {
         Command { inner: imp::Command::new(program.as_ref()) }

src/bootstrap/src/core/build_steps/format.rs

@@ -93,7 +93,7 @@ fn get_modified_rs_files(build: &Builder<'_>) -> Result<Option<Vec<String>>, Str
         return Ok(None);
     }
 
-    get_git_modified_files(&build.config.git_config(), Some(&build.config.src), &vec!["rs"])
+    get_git_modified_files(&build.config.git_config(), Some(&build.config.src), &["rs"])
 }
 
 #[derive(serde_derive::Deserialize)]

src/tools/build-manifest/src/main.rs

@@ -495,7 +495,7 @@ impl Builder {
                 Some(p) => p,
                 None => return false,
             };
-            pkg.target.get(&c.target).is_some()
+            pkg.target.contains_key(&c.target)
         };
         extensions.retain(&has_component);
         components.retain(&has_component);

src/tools/build_helper/src/git.rs

@@ -21,7 +21,7 @@ fn output_result(cmd: &mut Command) -> Result<String, String> {
             String::from_utf8(output.stderr).map_err(|err| format!("{err:?}"))?
         ));
     }
-    Ok(String::from_utf8(output.stdout).map_err(|err| format!("{err:?}"))?)
+    String::from_utf8(output.stdout).map_err(|err| format!("{err:?}"))
 }
 
 /// Finds the remote for rust-lang/rust.
@@ -64,18 +64,14 @@ pub fn rev_exists(rev: &str, git_dir: Option<&Path>) -> Result<bool, String> {
     match output.status.code() {
         Some(0) => Ok(true),
         Some(128) => Ok(false),
-        None => {
-            return Err(format!(
-                "git didn't exit properly: {}",
-                String::from_utf8(output.stderr).map_err(|err| format!("{err:?}"))?
-            ));
-        }
-        Some(code) => {
-            return Err(format!(
-                "git command exited with status code: {code}: {}",
-                String::from_utf8(output.stderr).map_err(|err| format!("{err:?}"))?
-            ));
-        }
+        None => Err(format!(
+            "git didn't exit properly: {}",
+            String::from_utf8(output.stderr).map_err(|err| format!("{err:?}"))?
+        )),
+        Some(code) => Err(format!(
+            "git command exited with status code: {code}: {}",
+            String::from_utf8(output.stderr).map_err(|err| format!("{err:?}"))?
+        )),
     }
 }
 
@@ -96,7 +92,7 @@ pub fn updated_master_branch(
         }
     }
 
-    Err(format!("Cannot find any suitable upstream master branch"))
+    Err("Cannot find any suitable upstream master branch".to_owned())
 }
 
 pub fn get_git_merge_base(
@@ -118,7 +114,7 @@ pub fn get_git_merge_base(
 pub fn get_git_modified_files(
     config: &GitConfig<'_>,
     git_dir: Option<&Path>,
-    extensions: &Vec<&str>,
+    extensions: &[&str],
 ) -> Result<Option<Vec<String>>, String> {
     let merge_base = get_git_merge_base(config, git_dir)?;
 

src/tools/compiletest/src/common.rs

@@ -582,7 +582,7 @@ impl TargetCfgs {
                         name,
                         Some(
                             value
-                                .strip_suffix("\"")
+                                .strip_suffix('\"')
                                 .expect("key-value pair should be properly quoted"),
                         ),
                     )

src/tools/compiletest/src/header.rs

@@ -82,7 +82,7 @@ impl EarlyProps {
             panic!("errors encountered during EarlyProps parsing");
         }
 
-        return props;
+        props
     }
 }
 
@@ -382,7 +382,7 @@ impl TestProps {
                         // Individual flags can be single-quoted to preserve spaces; see
                         // <https://github.com/rust-lang/rust/pull/115948/commits/957c5db6>.
                         flags
-                            .split("'")
+                            .split('\'')
                             .enumerate()
                             .flat_map(|(i, f)| {
                                 if i % 2 == 1 { vec![f] } else { f.split_whitespace().collect() }
@@ -613,7 +613,7 @@ impl TestProps {
 
         for key in &["RUST_TEST_NOCAPTURE", "RUST_TEST_THREADS"] {
             if let Ok(val) = env::var(key) {
-                if self.exec_env.iter().find(|&&(ref x, _)| x == key).is_none() {
+                if !self.exec_env.iter().any(|&(ref x, _)| x == key) {
                     self.exec_env.push(((*key).to_owned(), val))
                 }
             }
@@ -991,7 +991,7 @@ pub(crate) fn check_directive(directive_ln: &str) -> CheckDirectiveResult<'_> {
     let trailing = post.trim().split_once(' ').map(|(pre, _)| pre).unwrap_or(post);
     let trailing_directive = {
         // 1. is the directive name followed by a space? (to exclude `:`)
-        matches!(directive_ln.get(directive_name.len()..), Some(s) if s.starts_with(" "))
+        matches!(directive_ln.get(directive_name.len()..), Some(s) if s.starts_with(' '))
             // 2. is what is after that directive also a directive (ex: "only-x86 only-arm")
             && KNOWN_DIRECTIVE_NAMES.contains(&trailing)
     }
@@ -1363,7 +1363,7 @@ pub fn extract_llvm_version_from_binary(binary_path: &str) -> Option<u32> {
     }
     let version = String::from_utf8(output.stdout).ok()?;
     for line in version.lines() {
-        if let Some(version) = line.split("LLVM version ").skip(1).next() {
+        if let Some(version) = line.split("LLVM version ").nth(1) {
             return extract_llvm_version(version);
         }
     }
@@ -1394,7 +1394,7 @@ where
 
     let min = parse(min)?;
     let max = match max {
-        Some(max) if max.is_empty() => return None,
+        Some("") => return None,
         Some(max) => parse(max)?,
         _ => min,
     };
@@ -1466,12 +1466,12 @@ pub fn make_test_description<R: Read>(
             decision!(ignore_gdb(config, ln));
             decision!(ignore_lldb(config, ln));
 
-            if config.target == "wasm32-unknown-unknown" {
-                if config.parse_name_directive(ln, directives::CHECK_RUN_RESULTS) {
-                    decision!(IgnoreDecision::Ignore {
-                        reason: "ignored on WASM as the run results cannot be checked there".into(),
-                    });
-                }
+            if config.target == "wasm32-unknown-unknown"
+                && config.parse_name_directive(ln, directives::CHECK_RUN_RESULTS)
+            {
+                decision!(IgnoreDecision::Ignore {
+                    reason: "ignored on WASM as the run results cannot be checked there".into(),
+                });
             }
 
             should_fail |= config.parse_name_directive(ln, "should-fail");

src/tools/compiletest/src/header/cfg.rs

@@ -58,7 +58,7 @@ pub(super) fn parse_cfg_name_directive<'a>(
 
     // Some of the matchers might be "" depending on what the target information is. To avoid
     // problems we outright reject empty directives.
-    if name == "" {
+    if name.is_empty() {
         return ParsedNameDirective::not_a_directive();
     }
 

src/tools/compiletest/src/lib.rs

@@ -1147,7 +1147,7 @@ fn extract_lldb_version(full_version_line: &str) -> Option<(u32, bool)> {
 }
 
 fn not_a_digit(c: char) -> bool {
-    !c.is_digit(10)
+    !c.is_ascii_digit()
 }
 
 fn check_overlapping_tests(found_paths: &HashSet<PathBuf>) {

src/tools/compiletest/src/read2.rs

@@ -6,7 +6,6 @@ mod tests;
 
 pub use self::imp::read2;
 use std::io::{self, Write};
-use std::mem::replace;
 use std::process::{Child, Output};
 
 #[derive(Copy, Clone, Debug)]
@@ -101,10 +100,10 @@ impl ProcOutput {
                     return;
                 }
 
-                let mut head = replace(bytes, Vec::new());
+                let mut head = std::mem::take(bytes);
                 // Don't truncate if this as a whole line.
                 // That should make it less likely that we cut a JSON line in half.
-                if head.last() != Some(&('\n' as u8)) {
+                if head.last() != Some(&b'\n') {
                     head.truncate(MAX_OUT_LEN);
                 }
                 let skipped = new_len - head.len();

src/tools/compiletest/src/read2/tests.rs

@@ -64,9 +64,9 @@ fn test_abbreviate_filterss_are_detected() {
 #[test]
 fn test_abbreviate_filters_avoid_abbreviations() {
     let mut out = ProcOutput::new();
-    let filters = &[std::iter::repeat('a').take(64).collect::<String>()];
+    let filters = &["a".repeat(64)];
 
-    let mut expected = vec![b'.'; MAX_OUT_LEN - FILTERED_PATHS_PLACEHOLDER_LEN as usize];
+    let mut expected = vec![b'.'; MAX_OUT_LEN - FILTERED_PATHS_PLACEHOLDER_LEN];
     expected.extend_from_slice(filters[0].as_bytes());
 
     out.extend(&expected, filters);
@@ -81,7 +81,7 @@ fn test_abbreviate_filters_avoid_abbreviations() {
 #[test]
 fn test_abbreviate_filters_can_still_cause_abbreviations() {
     let mut out = ProcOutput::new();
-    let filters = &[std::iter::repeat('a').take(64).collect::<String>()];
+    let filters = &["a".repeat(64)];
 
     let mut input = vec![b'.'; MAX_OUT_LEN];
     input.extend_from_slice(filters[0].as_bytes());