Auto merge of rust-lang#80364 - Dylan-DPC:rollup-0y96okz, r=Dylan-DPC

Rollup of 11 pull requests

Successful merges:

 - rust-lang#79213 (Stabilize `core::slice::fill`)
 - rust-lang#79999 (Refactored verbose print into a function)
 - rust-lang#80160 (Implemented a compiler diagnostic for move async mistake)
 - rust-lang#80274 (Rename rustc_middle::lint::LintSource)
 - rust-lang#80280 (Add installation commands to `x` tool README)
 - rust-lang#80319 (Fix elided lifetimes shown as `'_` on async functions)
 - rust-lang#80327 (Updated the match with the matches macro)
 - rust-lang#80330 (Fix typo in simplify_try.rs)
 - rust-lang#80340 (Don't unnecessarily override attrs for Module)
 - rust-lang#80342 (Fix typo)
 - rust-lang#80352 (BTreeMap: make test cases more explicit on failure)

Failed merges:

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

compiler/rustc_lint/src/levels.rs

@@ -12,7 +12,9 @@ use rustc_hir::{intravisit, HirId};
 use rustc_middle::hir::map::Map;
 use rustc_middle::lint::LevelSource;
 use rustc_middle::lint::LintDiagnosticBuilder;
-use rustc_middle::lint::{struct_lint_level, LintLevelMap, LintLevelSets, LintSet, LintSource};
+use rustc_middle::lint::{
+    struct_lint_level, LintLevelMap, LintLevelSets, LintLevelSource, LintSet,
+};
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::lint::{builtin, Level, Lint, LintId};
@@ -91,7 +93,7 @@ impl<'s> LintLevelsBuilder<'s> {
             };
             for id in ids {
                 self.check_gated_lint(id, DUMMY_SP);
-                let src = LintSource::CommandLine(lint_flag_val, orig_level);
+                let src = LintLevelSource::CommandLine(lint_flag_val, orig_level);
                 specs.insert(id, (level, src));
             }
         }
@@ -128,19 +130,19 @@ impl<'s> LintLevelsBuilder<'s> {
                 );
                 diag_builder.span_label(src.span(), "overruled by previous forbid");
                 match old_src {
-                    LintSource::Default => {
+                    LintLevelSource::Default => {
                         diag_builder.note(&format!(
                             "`forbid` lint level is the default for {}",
                             id.to_string()
                         ));
                     }
-                    LintSource::Node(_, forbid_source_span, reason) => {
+                    LintLevelSource::Node(_, forbid_source_span, reason) => {
                         diag_builder.span_label(forbid_source_span, "`forbid` level set here");
                         if let Some(rationale) = reason {
                             diag_builder.note(&rationale.as_str());
                         }
                     }
-                    LintSource::CommandLine(_, _) => {
+                    LintLevelSource::CommandLine(_, _) => {
                         diag_builder.note("`forbid` lint level was set on command line");
                     }
                 }
@@ -276,7 +278,7 @@ impl<'s> LintLevelsBuilder<'s> {
                 let name = meta_item.path.segments.last().expect("empty lint name").ident.name;
                 match store.check_lint_name(&name.as_str(), tool_name) {
                     CheckLintNameResult::Ok(ids) => {
-                        let src = LintSource::Node(name, li.span(), reason);
+                        let src = LintLevelSource::Node(name, li.span(), reason);
                         for &id in ids {
                             self.check_gated_lint(id, attr.span);
                             self.insert_spec(&mut specs, id, (level, src));
@@ -287,7 +289,7 @@ impl<'s> LintLevelsBuilder<'s> {
                         match result {
                             Ok(ids) => {
                                 let complete_name = &format!("{}::{}", tool_name.unwrap(), name);
-                                let src = LintSource::Node(
+                                let src = LintLevelSource::Node(
                                     Symbol::intern(complete_name),
                                     li.span(),
                                     reason,
@@ -324,7 +326,7 @@ impl<'s> LintLevelsBuilder<'s> {
                                     },
                                 );
 
-                                let src = LintSource::Node(
+                                let src = LintLevelSource::Node(
                                     Symbol::intern(&new_lint_name),
                                     li.span(),
                                     reason,
@@ -403,7 +405,7 @@ impl<'s> LintLevelsBuilder<'s> {
                 }
 
                 let (lint_attr_name, lint_attr_span) = match *src {
-                    LintSource::Node(name, span, _) => (name, span),
+                    LintLevelSource::Node(name, span, _) => (name, span),
                     _ => continue,
                 };
 
@@ -460,7 +462,7 @@ impl<'s> LintLevelsBuilder<'s> {
     }
 
     /// Find the lint level for a lint.
-    pub fn lint_level(&self, lint: &'static Lint) -> (Level, LintSource) {
+    pub fn lint_level(&self, lint: &'static Lint) -> (Level, LintLevelSource) {
         self.sets.get_lint_level(lint, self.cur, None, self.sess)
     }
 

compiler/rustc_middle/src/lint.rs

@@ -13,7 +13,7 @@ use rustc_span::{symbol, Span, Symbol, DUMMY_SP};
 
 /// How a lint level was set.
 #[derive(Clone, Copy, PartialEq, Eq, HashStable)]
-pub enum LintSource {
+pub enum LintLevelSource {
     /// Lint is at the default level as declared
     /// in rustc or a plugin.
     Default,
@@ -27,25 +27,26 @@ pub enum LintSource {
     CommandLine(Symbol, Level),
 }
 
-impl LintSource {
+impl LintLevelSource {
     pub fn name(&self) -> Symbol {
         match *self {
-            LintSource::Default => symbol::kw::Default,
-            LintSource::Node(name, _, _) => name,
-            LintSource::CommandLine(name, _) => name,
+            LintLevelSource::Default => symbol::kw::Default,
+            LintLevelSource::Node(name, _, _) => name,
+            LintLevelSource::CommandLine(name, _) => name,
         }
     }
 
     pub fn span(&self) -> Span {
         match *self {
-            LintSource::Default => DUMMY_SP,
-            LintSource::Node(_, span, _) => span,
-            LintSource::CommandLine(_, _) => DUMMY_SP,
+            LintLevelSource::Default => DUMMY_SP,
+            LintLevelSource::Node(_, span, _) => span,
+            LintLevelSource::CommandLine(_, _) => DUMMY_SP,
         }
     }
 }
 
-pub type LevelSource = (Level, LintSource);
+/// A tuple of a lint level and its source.
+pub type LevelSource = (Level, LintLevelSource);
 
 pub struct LintLevelSets {
     pub list: Vec<LintSet>,
@@ -113,7 +114,7 @@ impl LintLevelSets {
         id: LintId,
         mut idx: u32,
         aux: Option<&FxHashMap<LintId, LevelSource>>,
-    ) -> (Option<Level>, LintSource) {
+    ) -> (Option<Level>, LintLevelSource) {
         if let Some(specs) = aux {
             if let Some(&(level, src)) = specs.get(&id) {
                 return (Some(level), src);
@@ -125,7 +126,7 @@ impl LintLevelSets {
                     if let Some(&(level, src)) = specs.get(&id) {
                         return (Some(level), src);
                     }
-                    return (None, LintSource::Default);
+                    return (None, LintLevelSource::Default);
                 }
                 LintSet::Node { ref specs, parent } => {
                     if let Some(&(level, src)) = specs.get(&id) {
@@ -213,7 +214,7 @@ pub fn struct_lint_level<'s, 'd>(
     sess: &'s Session,
     lint: &'static Lint,
     level: Level,
-    src: LintSource,
+    src: LintLevelSource,
     span: Option<MultiSpan>,
     decorate: impl for<'a> FnOnce(LintDiagnosticBuilder<'a>) + 'd,
 ) {
@@ -223,7 +224,7 @@ pub fn struct_lint_level<'s, 'd>(
         sess: &'s Session,
         lint: &'static Lint,
         level: Level,
-        src: LintSource,
+        src: LintLevelSource,
         span: Option<MultiSpan>,
         decorate: Box<dyn for<'b> FnOnce(LintDiagnosticBuilder<'b>) + 'd>,
     ) {
@@ -274,14 +275,14 @@ pub fn struct_lint_level<'s, 'd>(
 
         let name = lint.name_lower();
         match src {
-            LintSource::Default => {
+            LintLevelSource::Default => {
                 sess.diag_note_once(
                     &mut err,
                     DiagnosticMessageId::from(lint),
                     &format!("`#[{}({})]` on by default", level.as_str(), name),
                 );
             }
-            LintSource::CommandLine(lint_flag_val, orig_level) => {
+            LintLevelSource::CommandLine(lint_flag_val, orig_level) => {
                 let flag = match orig_level {
                     Level::Warn => "-W",
                     Level::Deny => "-D",
@@ -310,7 +311,7 @@ pub fn struct_lint_level<'s, 'd>(
                     );
                 }
             }
-            LintSource::Node(lint_attr_name, src, reason) => {
+            LintLevelSource::Node(lint_attr_name, src, reason) => {
                 if let Some(rationale) = reason {
                     err.note(&rationale.as_str());
                 }

compiler/rustc_middle/src/ty/context.rs

@@ -5,7 +5,7 @@ use crate::dep_graph::{self, DepGraph, DepKind, DepNode, DepNodeExt};
 use crate::hir::exports::ExportMap;
 use crate::ich::{NodeIdHashingMode, StableHashingContext};
 use crate::infer::canonical::{Canonical, CanonicalVarInfo, CanonicalVarInfos};
-use crate::lint::{struct_lint_level, LintDiagnosticBuilder, LintSource};
+use crate::lint::{struct_lint_level, LintDiagnosticBuilder, LintLevelSource};
 use crate::middle;
 use crate::middle::cstore::{CrateStoreDyn, EncodedMetadata};
 use crate::middle::resolve_lifetime::{self, ObjectLifetimeDefault};
@@ -2559,7 +2559,7 @@ impl<'tcx> TyCtxt<'tcx> {
         self,
         lint: &'static Lint,
         mut id: hir::HirId,
-    ) -> (Level, LintSource) {
+    ) -> (Level, LintLevelSource) {
         let sets = self.lint_levels(LOCAL_CRATE);
         loop {
             if let Some(pair) = sets.level_and_source(lint, id, self.sess) {

compiler/rustc_middle/src/ty/list.rs

@@ -24,7 +24,7 @@ extern "C" {
 /// This means we can use pointer for both
 /// equality comparisons and hashing.
 ///
-/// Unlike slices, The types contained in `List` are expected to be `Copy`
+/// Unlike slices, the types contained in `List` are expected to be `Copy`
 /// and iterating over a `List` returns `T` instead of a reference.
 ///
 /// Note: `Slice` was already taken by the `Ty`.

compiler/rustc_middle/src/ty/sty.rs

@@ -215,10 +215,7 @@ pub enum TyKind<'tcx> {
 impl TyKind<'tcx> {
     #[inline]
     pub fn is_primitive(&self) -> bool {
-        match self {
-            Bool | Char | Int(_) | Uint(_) | Float(_) => true,
-            _ => false,
-        }
+        matches!(self, Bool | Char | Int(_) | Uint(_) | Float(_))
     }
 
     /// Get the article ("a" or "an") to use with this type.

compiler/rustc_mir/src/transform/simplify_try.rs

@@ -306,7 +306,7 @@ fn optimization_applies<'tcx>(
         return false;
     }
 
-    // Verify the assigment chain consists of the form b = a; c = b; d = c; etc...
+    // Verify the assignment chain consists of the form b = a; c = b; d = c; etc...
     if opt_info.field_tmp_assignments.is_empty() {
         trace!("NO: no assignments found");
         return false;

compiler/rustc_mir/src/util/pretty.rs

@@ -17,7 +17,7 @@ use rustc_middle::mir::interpret::{
 };
 use rustc_middle::mir::visit::Visitor;
 use rustc_middle::mir::*;
-use rustc_middle::ty::{self, TyCtxt, TypeFoldable, TypeVisitor};
+use rustc_middle::ty::{self, TyCtxt, TyS, TypeFoldable, TypeVisitor};
 use rustc_target::abi::Size;
 use std::ops::ControlFlow;
 
@@ -408,6 +408,18 @@ impl ExtraComments<'tcx> {
     }
 }
 
+fn use_verbose(ty: &&TyS<'tcx>) -> bool {
+    match ty.kind() {
+        ty::Int(_) | ty::Uint(_) | ty::Bool | ty::Char | ty::Float(_) => false,
+        // Unit type
+        ty::Tuple(g_args) if g_args.is_empty() => false,
+        ty::Tuple(g_args) => g_args.iter().any(|g_arg| use_verbose(&g_arg.expect_ty())),
+        ty::Array(ty, _) => use_verbose(ty),
+        ty::FnDef(..) => false,
+        _ => true,
+    }
+}
+
 impl Visitor<'tcx> for ExtraComments<'tcx> {
     fn visit_constant(&mut self, constant: &Constant<'tcx>, location: Location) {
         self.super_constant(constant, location);
@@ -430,16 +442,10 @@ impl Visitor<'tcx> for ExtraComments<'tcx> {
     fn visit_const(&mut self, constant: &&'tcx ty::Const<'tcx>, _: Location) {
         self.super_const(constant);
         let ty::Const { ty, val, .. } = constant;
-        match ty.kind() {
-            ty::Int(_) | ty::Uint(_) | ty::Bool | ty::Char | ty::Float(_) => {}
-            // Unit type
-            ty::Tuple(tys) if tys.is_empty() => {}
-            ty::FnDef(..) => {}
-            _ => {
-                self.push("ty::Const");
-                self.push(&format!("+ ty: {:?}", ty));
-                self.push(&format!("+ val: {:?}", val));
-            }
+        if use_verbose(ty) {
+            self.push("ty::Const");
+            self.push(&format!("+ ty: {:?}", ty));
+            self.push(&format!("+ val: {:?}", val));
         }
     }
 

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -1912,4 +1912,22 @@ impl<'a> Parser<'a> {
         *self = snapshot;
         Err(err)
     }
+
+    /// Get the diagnostics for the cases where `move async` is found.
+    ///
+    /// `move_async_span` starts at the 'm' of the move keyword and ends with the 'c' of the async keyword
+    pub(super) fn incorrect_move_async_order_found(
+        &self,
+        move_async_span: Span,
+    ) -> DiagnosticBuilder<'a> {
+        let mut err =
+            self.struct_span_err(move_async_span, "the order of `move` and `async` is incorrect");
+        err.span_suggestion_verbose(
+            move_async_span,
+            "try switching the order",
+            "async move".to_owned(),
+            Applicability::MaybeIncorrect,
+        );
+        err
+    }
 }

compiler/rustc_parse/src/parser/expr.rs

@@ -1603,7 +1603,7 @@ impl<'a> Parser<'a> {
             self.sess.gated_spans.gate(sym::async_closure, span);
         }
 
-        let capture_clause = self.parse_capture_clause();
+        let capture_clause = self.parse_capture_clause()?;
         let decl = self.parse_fn_block_decl()?;
         let decl_hi = self.prev_token.span;
         let body = match decl.output {
@@ -1626,8 +1626,18 @@ impl<'a> Parser<'a> {
     }
 
     /// Parses an optional `move` prefix to a closure-like construct.
-    fn parse_capture_clause(&mut self) -> CaptureBy {
-        if self.eat_keyword(kw::Move) { CaptureBy::Value } else { CaptureBy::Ref }
+    fn parse_capture_clause(&mut self) -> PResult<'a, CaptureBy> {
+        if self.eat_keyword(kw::Move) {
+            // Check for `move async` and recover
+            if self.check_keyword(kw::Async) {
+                let move_async_span = self.token.span.with_lo(self.prev_token.span.data().lo);
+                Err(self.incorrect_move_async_order_found(move_async_span))
+            } else {
+                Ok(CaptureBy::Value)
+            }
+        } else {
+            Ok(CaptureBy::Ref)
+        }
     }
 
     /// Parses the `|arg, arg|` header of a closure.
@@ -2019,7 +2029,7 @@ impl<'a> Parser<'a> {
     fn parse_async_block(&mut self, mut attrs: AttrVec) -> PResult<'a, P<Expr>> {
         let lo = self.token.span;
         self.expect_keyword(kw::Async)?;
-        let capture_clause = self.parse_capture_clause();
+        let capture_clause = self.parse_capture_clause()?;
         let (iattrs, body) = self.parse_inner_attrs_and_block()?;
         attrs.extend(iattrs);
         let kind = ExprKind::Async(capture_clause, DUMMY_NODE_ID, body);

library/alloc/src/collections/btree/map/tests.rs

@@ -115,7 +115,7 @@ impl<K, V> BTreeMap<K, V> {
 
 impl<'a, K: 'a, V: 'a> NodeRef<marker::Immut<'a>, K, V, marker::LeafOrInternal> {
     fn assert_min_len(self, min_len: usize) {
-        assert!(self.len() >= min_len, "{} < {}", self.len(), min_len);
+        assert!(self.len() >= min_len, "node len {} < {}", self.len(), min_len);
         if let node::ForceResult::Internal(node) = self.force() {
             for idx in 0..=node.len() {
                 let edge = unsafe { Handle::new_edge(node, idx) };

library/alloc/src/collections/btree/node/tests.rs

@@ -30,11 +30,15 @@ impl<'a, K: 'a, V: 'a> NodeRef<marker::Immut<'a>, K, V, marker::LeafOrInternal>
                 let depth = self.height();
                 let indent = "  ".repeat(depth);
                 result += &format!("\n{}", indent);
-                for idx in 0..leaf.len() {
-                    if idx > 0 {
-                        result += ", ";
+                if leaf.len() == 0 {
+                    result += "(empty node)";
+                } else {
+                    for idx in 0..leaf.len() {
+                        if idx > 0 {
+                            result += ", ";
+                        }
+                        result += &format!("{:?}", unsafe { leaf.key_at(idx) });
                     }
-                    result += &format!("{:?}", unsafe { leaf.key_at(idx) });
                 }
             }
             navigate::Position::Internal(_) => {}

library/core/src/slice/mod.rs

@@ -2581,14 +2581,12 @@ impl<T> [T] {
     /// # Examples
     ///
     /// ```
-    /// #![feature(slice_fill)]
-    ///
     /// let mut buf = vec![0; 10];
     /// buf.fill(1);
     /// assert_eq!(buf, vec![1; 10]);
     /// ```
     #[doc(alias = "memset")]
-    #[unstable(feature = "slice_fill", issue = "70758")]
+    #[stable(feature = "slice_fill", since = "1.50.0")]
     pub fn fill(&mut self, value: T)
     where
         T: Clone,