Merge pull request #4224 from rust-lang/rustup-2025-03-11

Automatic Rustup

5 files changed, 82 insertions, 19 deletions

diff --git a/compiler/rustc_parse/src/parser/diagnostics.rs b/compiler/rustc_parse/src/parser/diagnostics.rs
index 94db43bb59f..bb227a58cf1 100644
--- a/compiler/rustc_parse/src/parser/diagnostics.rs
+++ b/compiler/rustc_parse/src/parser/diagnostics.rs
@@ -31,15 +31,15 @@ use super::{
     SeqSep, TokenType,
 };
 use crate::errors::{
-    AddParen, AmbiguousPlus, AsyncMoveBlockIn2015, AttributeOnParamType, AwaitSuggestion,
-    BadQPathStage2, BadTypePlus, BadTypePlusSub, ColonAsSemi, ComparisonOperatorsCannotBeChained,
-    ComparisonOperatorsCannotBeChainedSugg, ConstGenericWithoutBraces,
-    ConstGenericWithoutBracesSugg, DocCommentDoesNotDocumentAnything, DocCommentOnParamType,
-    DoubleColonInBound, ExpectedIdentifier, ExpectedSemi, ExpectedSemiSugg,
+    AddParen, AmbiguousPlus, AsyncMoveBlockIn2015, AsyncUseBlockIn2015, AttributeOnParamType,
+    AwaitSuggestion, BadQPathStage2, BadTypePlus, BadTypePlusSub, ColonAsSemi,
+    ComparisonOperatorsCannotBeChained, ComparisonOperatorsCannotBeChainedSugg,
+    ConstGenericWithoutBraces, ConstGenericWithoutBracesSugg, DocCommentDoesNotDocumentAnything,
+    DocCommentOnParamType, DoubleColonInBound, ExpectedIdentifier, ExpectedSemi, ExpectedSemiSugg,
     GenericParamsWithoutAngleBrackets, GenericParamsWithoutAngleBracketsSugg,
     HelpIdentifierStartsWithNumber, HelpUseLatestEdition, InInTypo, IncorrectAwait,
-    IncorrectSemicolon, IncorrectUseOfAwait, PatternMethodParamWithoutBody, QuestionMarkInType,
-    QuestionMarkInTypeSugg, SelfParamNotFirst, StructLiteralBodyWithoutPath,
+    IncorrectSemicolon, IncorrectUseOfAwait, IncorrectUseOfUse, PatternMethodParamWithoutBody,
+    QuestionMarkInType, QuestionMarkInTypeSugg, SelfParamNotFirst, StructLiteralBodyWithoutPath,
     StructLiteralBodyWithoutPathSugg, StructLiteralNeedingParens, StructLiteralNeedingParensSugg,
     SuggAddMissingLetStmt, SuggEscapeIdentifier, SuggRemoveComma, TernaryOperator,
     UnexpectedConstInGenericParam, UnexpectedConstParamDeclaration,
@@ -572,10 +572,17 @@ impl<'a> Parser<'a> {
             return Err(self.dcx().create_err(UseEqInstead { span: self.token.span }));
         }
 
-        if self.token.is_keyword(kw::Move) && self.prev_token.is_keyword(kw::Async) {
-            // The 2015 edition is in use because parsing of `async move` has failed.
+        if (self.token.is_keyword(kw::Move) || self.token.is_keyword(kw::Use))
+            && self.prev_token.is_keyword(kw::Async)
+        {
+            // The 2015 edition is in use because parsing of `async move` or `async use` has failed.
             let span = self.prev_token.span.to(self.token.span);
-            return Err(self.dcx().create_err(AsyncMoveBlockIn2015 { span }));
+            if self.token.is_keyword(kw::Move) {
+                return Err(self.dcx().create_err(AsyncMoveBlockIn2015 { span }));
+            } else {
+                // kw::Use
+                return Err(self.dcx().create_err(AsyncUseBlockIn2015 { span }));
+            }
         }
 
         let expect = tokens_to_string(&expected);
@@ -1991,7 +1998,7 @@ impl<'a> Parser<'a> {
             self.parse_expr()
         }
         .map_err(|mut err| {
-            err.span_label(await_sp, "while parsing this incorrect await expression");
+            err.span_label(await_sp, format!("while parsing this incorrect await expression"));
             err
         })?;
         Ok((expr.span, expr, is_question))
@@ -2030,6 +2037,21 @@ impl<'a> Parser<'a> {
             self.dcx().emit_err(IncorrectUseOfAwait { span });
         }
     }
+    ///
+    /// If encountering `x.use()`, consumes and emits an error.
+    pub(super) fn recover_from_use(&mut self) {
+        if self.token == token::OpenDelim(Delimiter::Parenthesis)
+            && self.look_ahead(1, |t| t == &token::CloseDelim(Delimiter::Parenthesis))
+        {
+            // var.use()
+            let lo = self.token.span;
+            self.bump(); // (
+            let span = lo.to(self.token.span);
+            self.bump(); // )
+
+            self.dcx().emit_err(IncorrectUseOfUse { span });
+        }
+    }
 
     pub(super) fn try_macro_suggestion(&mut self) -> PResult<'a, P<Expr>> {
         let is_try = self.token.is_keyword(kw::Try);
diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index cab0c7df3e0..9b2d562a69e 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -778,6 +778,7 @@ impl<'a> Parser<'a> {
                     ExprKind::MethodCall(_) => "a method call",
                     ExprKind::Call(_, _) => "a function call",
                     ExprKind::Await(_, _) => "`.await`",
+                    ExprKind::Use(_, _) => "`.use`",
                     ExprKind::Match(_, _, MatchKind::Postfix) => "a postfix match",
                     ExprKind::Err(_) => return Ok(with_postfix),
                     _ => unreachable!("parse_dot_or_call_expr_with_ shouldn't produce this"),
@@ -1296,6 +1297,12 @@ impl<'a> Parser<'a> {
             return Ok(self.mk_await_expr(self_arg, lo));
         }
 
+        if self.eat_keyword(exp!(Use)) {
+            let use_span = self.prev_token.span;
+            self.psess.gated_spans.gate(sym::ergonomic_clones, use_span);
+            return Ok(self.mk_use_expr(self_arg, lo));
+        }
+
         // Post-fix match
         if self.eat_keyword(exp!(Match)) {
             let match_span = self.prev_token.span;
@@ -1396,6 +1403,7 @@ impl<'a> Parser<'a> {
             } else if this.check_path() {
                 this.parse_expr_path_start()
             } else if this.check_keyword(exp!(Move))
+                || this.check_keyword(exp!(Use))
                 || this.check_keyword(exp!(Static))
                 || this.check_const_closure()
             {
@@ -2387,7 +2395,7 @@ impl<'a> Parser<'a> {
         Ok(closure)
     }
 
-    /// Parses an optional `move` prefix to a closure-like construct.
+    /// Parses an optional `move` or `use` prefix to a closure-like construct.
     fn parse_capture_clause(&mut self) -> PResult<'a, CaptureBy> {
         if self.eat_keyword(exp!(Move)) {
             let move_kw_span = self.prev_token.span;
@@ -2400,6 +2408,16 @@ impl<'a> Parser<'a> {
             } else {
                 Ok(CaptureBy::Value { move_kw: move_kw_span })
             }
+        } else if self.eat_keyword(exp!(Use)) {
+            let use_kw_span = self.prev_token.span;
+            self.psess.gated_spans.gate(sym::ergonomic_clones, use_kw_span);
+            // Check for `use async` and recover
+            if self.check_keyword(exp!(Async)) {
+                let use_async_span = self.token.span.with_lo(self.prev_token.span.data().lo);
+                Err(self.dcx().create_err(errors::AsyncUseOrderIncorrect { span: use_async_span }))
+            } else {
+                Ok(CaptureBy::Use { use_kw: use_kw_span })
+            }
         } else {
             Ok(CaptureBy::Ref)
         }
@@ -3414,7 +3432,7 @@ impl<'a> Parser<'a> {
         self.is_keyword_ahead(lookahead, &[kw])
             && ((
                 // `async move {`
-                self.is_keyword_ahead(lookahead + 1, &[kw::Move])
+                self.is_keyword_ahead(lookahead + 1, &[kw::Move, kw::Use])
                     && self.look_ahead(lookahead + 2, |t| {
                         *t == token::OpenDelim(Delimiter::Brace) || t.is_whole_block()
                     })
@@ -3817,6 +3835,13 @@ impl<'a> Parser<'a> {
         await_expr
     }
 
+    fn mk_use_expr(&mut self, self_arg: P<Expr>, lo: Span) -> P<Expr> {
+        let span = lo.to(self.prev_token.span);
+        let use_expr = self.mk_expr(span, ExprKind::Use(self_arg, self.prev_token.span));
+        self.recover_from_use();
+        use_expr
+    }
+
     pub(crate) fn mk_expr_with_attrs(&self, span: Span, kind: ExprKind, attrs: AttrVec) -> P<Expr> {
         P(Expr { kind, span, attrs, id: DUMMY_NODE_ID, tokens: None })
     }
@@ -3965,6 +3990,7 @@ impl MutVisitor for CondChecker<'_> {
             }
             ExprKind::Unary(_, _)
             | ExprKind::Await(_, _)
+            | ExprKind::Use(_, _)
             | ExprKind::AssignOp(_, _, _)
             | ExprKind::Range(_, _, _)
             | ExprKind::Try(_)
diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs
index 5d537a0e144..dc6b426f514 100644
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -212,7 +212,7 @@ impl<'a> Parser<'a> {
         let check_pub = def == &Defaultness::Final;
         let mut def_ = || mem::replace(def, Defaultness::Final);
 
-        let info = if self.eat_keyword_case(exp!(Use), case) {
+        let info = if !self.is_use_closure() && self.eat_keyword_case(exp!(Use), case) {
             self.parse_use_item()?
         } else if self.check_fn_front_matter(check_pub, case) {
             // FUNCTION ITEM
@@ -1280,6 +1280,21 @@ impl<'a> Parser<'a> {
         None
     }
 
+    fn is_use_closure(&self) -> bool {
+        if self.token.is_keyword(kw::Use) {
+            // Check if this could be a closure.
+            self.look_ahead(1, |token| {
+                // Move or Async here would be an error but still we're parsing a closure
+                let dist =
+                    if token.is_keyword(kw::Move) || token.is_keyword(kw::Async) { 2 } else { 1 };
+
+                self.look_ahead(dist, |token| matches!(token.kind, token::Or | token::OrOr))
+            })
+        } else {
+            false
+        }
+    }
+
     fn is_unsafe_foreign_mod(&self) -> bool {
         self.token.is_keyword(kw::Unsafe)
             && self.is_keyword_ahead(1, &[kw::Extern])
@@ -1293,7 +1308,7 @@ impl<'a> Parser<'a> {
         if self.check_keyword(exp!(Static)) {
             // Check if this could be a closure.
             !self.look_ahead(1, |token| {
-                if token.is_keyword(kw::Move) {
+                if token.is_keyword(kw::Move) || token.is_keyword(kw::Use) {
                     return true;
                 }
                 matches!(token.kind, token::Or | token::OrOr)
diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs
index 0bb6e2ab126..323c0c1d6d0 100644
--- a/compiler/rustc_parse/src/parser/mod.rs
+++ b/compiler/rustc_parse/src/parser/mod.rs
@@ -813,9 +813,9 @@ impl<'a> Parser<'a> {
         self.is_keyword_ahead(0, &[kw::Const])
             && self.look_ahead(1, |t| match &t.kind {
                 // async closures do not work with const closures, so we do not parse that here.
-                token::Ident(kw::Move | kw::Static, IdentIsRaw::No) | token::OrOr | token::Or => {
-                    true
-                }
+                token::Ident(kw::Move | kw::Use | kw::Static, IdentIsRaw::No)
+                | token::OrOr
+                | token::Or => true,
                 _ => false,
             })
     }
diff --git a/compiler/rustc_parse/src/parser/token_type.rs b/compiler/rustc_parse/src/parser/token_type.rs
index 110546d0ba6..886438fd583 100644
--- a/compiler/rustc_parse/src/parser/token_type.rs
+++ b/compiler/rustc_parse/src/parser/token_type.rs
@@ -619,7 +619,7 @@ impl Iterator for TokenTypeSetIter {
     type Item = TokenType;
 
     fn next(&mut self) -> Option<TokenType> {
-        let num_bits: u32 = (std::mem::size_of_val(&self.0.0) * 8) as u32;
+        let num_bits: u32 = (size_of_val(&self.0.0) * 8) as u32;
         assert_eq!(num_bits, 128);
         let z = self.0.0.trailing_zeros();
         if z == num_bits {