Auto merge of rust-lang#3428 - rust-lang:rustup-2024-03-30, r=RalfJung

Automatic Rustup

compiler/rustc_ast/src/ast.rs

@@ -702,19 +702,10 @@ pub struct PatField {
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 #[derive(Encodable, Decodable, HashStable_Generic)]
 pub enum ByRef {
-    Yes,
+    Yes(Mutability),
     No,
 }
 
-impl From<bool> for ByRef {
-    fn from(b: bool) -> ByRef {
-        match b {
-            false => ByRef::No,
-            true => ByRef::Yes,
-        }
-    }
-}
-
 /// Explicit binding annotations given in the HIR for a binding. Note
 /// that this is not the final binding *mode* that we infer after type
 /// inference.
@@ -724,16 +715,20 @@ pub struct BindingAnnotation(pub ByRef, pub Mutability);
 
 impl BindingAnnotation {
     pub const NONE: Self = Self(ByRef::No, Mutability::Not);
-    pub const REF: Self = Self(ByRef::Yes, Mutability::Not);
+    pub const REF: Self = Self(ByRef::Yes(Mutability::Not), Mutability::Not);
     pub const MUT: Self = Self(ByRef::No, Mutability::Mut);
-    pub const REF_MUT: Self = Self(ByRef::Yes, Mutability::Mut);
+    pub const REF_MUT: Self = Self(ByRef::Yes(Mutability::Mut), Mutability::Not);
+    pub const MUT_REF: Self = Self(ByRef::Yes(Mutability::Not), Mutability::Mut);
+    pub const MUT_REF_MUT: Self = Self(ByRef::Yes(Mutability::Mut), Mutability::Mut);
 
     pub fn prefix_str(self) -> &'static str {
         match self {
             Self::NONE => "",
             Self::REF => "ref ",
             Self::MUT => "mut ",
             Self::REF_MUT => "ref mut ",
+            Self::MUT_REF => "mut ref ",
+            Self::MUT_REF_MUT => "mut ref mut ",
         }
     }
 }

compiler/rustc_ast_lowering/src/lib.rs

@@ -1847,8 +1847,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                     // the case where we have a mutable pattern to a reference as that would
                     // no longer be an `ImplicitSelf`.
                     TyKind::Ref(_, mt) if mt.ty.kind.is_implicit_self() => match mt.mutbl {
-                        hir::Mutability::Not => hir::ImplicitSelfKind::ImmRef,
-                        hir::Mutability::Mut => hir::ImplicitSelfKind::MutRef,
+                        hir::Mutability::Not => hir::ImplicitSelfKind::RefImm,
+                        hir::Mutability::Mut => hir::ImplicitSelfKind::RefMut,
                     },
                     _ => hir::ImplicitSelfKind::None,
                 }

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -1552,7 +1552,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
 /// When encountering an equality constraint in a `where` clause, emit an error. If the code seems
 /// like it's setting an associated type, provide an appropriate suggestion.
 fn deny_equality_constraints(
-    this: &mut AstValidator<'_>,
+    this: &AstValidator<'_>,
     predicate: &WhereEqPredicate,
     generics: &Generics,
 ) {

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -565,6 +565,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     gate_all!(unnamed_fields, "unnamed fields are not yet fully implemented");
     gate_all!(fn_delegation, "functions delegation is not yet fully implemented");
     gate_all!(postfix_match, "postfix match is experimental");
+    gate_all!(mut_ref, "mutable by-reference bindings are experimental");
 
     if !visitor.features.never_patterns {
         if let Some(spans) = spans.get(&sym::never_patterns) {

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -1545,12 +1545,15 @@ impl<'a> State<'a> {
             PatKind::Wild => self.word("_"),
             PatKind::Never => self.word("!"),
             PatKind::Ident(BindingAnnotation(by_ref, mutbl), ident, sub) => {
-                if *by_ref == ByRef::Yes {
-                    self.word_nbsp("ref");
-                }
                 if mutbl.is_mut() {
                     self.word_nbsp("mut");
                 }
+                if let ByRef::Yes(rmutbl) = by_ref {
+                    self.word_nbsp("ref");
+                    if rmutbl.is_mut() {
+                        self.word_nbsp("mut");
+                    }
+                }
                 self.print_ident(*ident);
                 if let Some(p) = sub {
                     self.space();

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -337,7 +337,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     fn suggest_ref_or_clone(
-        &mut self,
+        &self,
         mpi: MovePathIndex,
         move_span: Span,
         err: &mut Diag<'tcx>,
@@ -1125,7 +1125,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     pub(crate) fn report_use_while_mutably_borrowed(
-        &mut self,
+        &self,
         location: Location,
         (place, _span): (Place<'tcx>, Span),
         borrow: &BorrowData<'tcx>,
@@ -1174,7 +1174,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     pub(crate) fn report_conflicting_borrow(
-        &mut self,
+        &self,
         location: Location,
         (place, span): (Place<'tcx>, Span),
         gen_borrow_kind: BorrowKind,
@@ -2463,7 +2463,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     fn report_local_value_does_not_live_long_enough(
-        &mut self,
+        &self,
         location: Location,
         name: &str,
         borrow: &BorrowData<'tcx>,
@@ -2642,7 +2642,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     fn report_thread_local_value_does_not_live_long_enough(
-        &mut self,
+        &self,
         drop_span: Span,
         borrow_span: Span,
     ) -> Diag<'tcx> {
@@ -2663,7 +2663,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
     #[instrument(level = "debug", skip(self))]
     fn report_temporary_value_does_not_live_long_enough(
-        &mut self,
+        &self,
         location: Location,
         borrow: &BorrowData<'tcx>,
         drop_span: Span,
@@ -2921,7 +2921,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
     #[instrument(level = "debug", skip(self))]
     fn report_escaping_closure_capture(
-        &mut self,
+        &self,
         use_span: UseSpans<'tcx>,
         var_span: Span,
         fr_name: &RegionName,
@@ -3031,7 +3031,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     fn report_escaping_data(
-        &mut self,
+        &self,
         borrow_span: Span,
         name: &Option<String>,
         upvar_span: Span,
@@ -3065,7 +3065,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     }
 
     fn get_moved_indexes(
-        &mut self,
+        &self,
         location: Location,
         mpi: MovePathIndex,
     ) -> (Vec<MoveSite>, Vec<Location>) {
@@ -3854,7 +3854,7 @@ enum AnnotatedBorrowFnSignature<'tcx> {
 impl<'tcx> AnnotatedBorrowFnSignature<'tcx> {
     /// Annotate the provided diagnostic with information about borrow from the fn signature that
     /// helps explain.
-    pub(crate) fn emit(&self, cx: &mut MirBorrowckCtxt<'_, 'tcx>, diag: &mut Diag<'_>) -> String {
+    pub(crate) fn emit(&self, cx: &MirBorrowckCtxt<'_, 'tcx>, diag: &mut Diag<'_>) -> String {
         match self {
             &AnnotatedBorrowFnSignature::Closure { argument_ty, argument_span } => {
                 diag.span_label(

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -4,9 +4,8 @@
 use core::ops::ControlFlow;
 use hir::{ExprKind, Param};
 use rustc_errors::{Applicability, Diag};
-use rustc_hir as hir;
 use rustc_hir::intravisit::Visitor;
-use rustc_hir::Node;
+use rustc_hir::{self as hir, BindingAnnotation, ByRef, Node};
 use rustc_infer::traits;
 use rustc_middle::mir::{Mutability, Place, PlaceRef, ProjectionElem};
 use rustc_middle::ty::{self, InstanceDef, ToPredicate, Ty, TyCtxt};
@@ -304,7 +303,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 {
                     match *decl.local_info() {
                         LocalInfo::User(BindingForm::Var(mir::VarBindingForm {
-                            binding_mode: ty::BindingMode::BindByValue(Mutability::Not),
+                            binding_mode: BindingAnnotation(ByRef::No, Mutability::Not),
                             opt_ty_info: Some(sp),
                             opt_match_place: _,
                             pat_span: _,
@@ -342,7 +341,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 } else if decl.mutability.is_not() {
                     if matches!(
                         decl.local_info(),
-                        LocalInfo::User(BindingForm::ImplicitSelf(hir::ImplicitSelfKind::MutRef))
+                        LocalInfo::User(BindingForm::ImplicitSelf(hir::ImplicitSelfKind::RefMut))
                     ) {
                         err.note(
                             "as `Self` may be unsized, this call attempts to take `&mut &mut self`",
@@ -407,7 +406,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                             if let Some(fn_decl) = node.fn_decl() {
                                 if !matches!(
                                     fn_decl.implicit_self,
-                                    hir::ImplicitSelfKind::ImmRef | hir::ImplicitSelfKind::MutRef
+                                    hir::ImplicitSelfKind::RefImm | hir::ImplicitSelfKind::RefMut
                                 ) {
                                     err.span_suggestion(
                                         upvar_ident.span,
@@ -717,7 +716,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
         debug!("local_decl: {:?}", local_decl);
         let pat_span = match *local_decl.local_info() {
             LocalInfo::User(BindingForm::Var(mir::VarBindingForm {
-                binding_mode: ty::BindingMode::BindByValue(Mutability::Not),
+                binding_mode: BindingAnnotation(ByRef::No, Mutability::Not),
                 opt_ty_info: _,
                 opt_match_place: _,
                 pat_span,
@@ -1070,7 +1069,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
             }
 
             LocalInfo::User(mir::BindingForm::Var(mir::VarBindingForm {
-                binding_mode: ty::BindingMode::BindByValue(_),
+                binding_mode: BindingAnnotation(ByRef::No, _),
                 opt_ty_info,
                 ..
             })) => {
@@ -1138,7 +1137,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
             }
 
             LocalInfo::User(mir::BindingForm::Var(mir::VarBindingForm {
-                binding_mode: ty::BindingMode::BindByReference(_),
+                binding_mode: BindingAnnotation(ByRef::Yes(_), _),
                 ..
             })) => {
                 let pattern_span: Span = local_decl.source_info.span;
@@ -1329,7 +1328,7 @@ pub fn mut_borrow_of_mutable_ref(local_decl: &LocalDecl<'_>, local_name: Option<
     match *local_decl.local_info() {
         // Check if mutably borrowing a mutable reference.
         LocalInfo::User(mir::BindingForm::Var(mir::VarBindingForm {
-            binding_mode: ty::BindingMode::BindByValue(Mutability::Not),
+            binding_mode: BindingAnnotation(ByRef::No, Mutability::Not),
             ..
         })) => matches!(local_decl.ty.kind(), ty::Ref(_, _, hir::Mutability::Mut)),
         LocalInfo::User(mir::BindingForm::ImplicitSelf(kind)) => {
@@ -1338,7 +1337,7 @@ pub fn mut_borrow_of_mutable_ref(local_decl: &LocalDecl<'_>, local_name: Option<
             //
             // Deliberately fall into this case for all implicit self types,
             // so that we don't fall into the next case with them.
-            kind == hir::ImplicitSelfKind::MutRef
+            kind == hir::ImplicitSelfKind::RefMut
         }
         _ if Some(kw::SelfLower) == local_name => {
             // Otherwise, check if the name is the `self` keyword - in which case

compiler/rustc_borrowck/src/type_check/liveness/polonius.rs

@@ -87,6 +87,8 @@ pub(super) fn populate_access_facts<'a, 'tcx>(
     body: &Body<'tcx>,
     location_table: &LocationTable,
     move_data: &MoveData<'tcx>,
+    //FIXME: this is not mutated, but expected to be modified as
+    // out param, bug?
     dropped_at: &mut Vec<(Local, Location)>,
 ) {
     debug!("populate_access_facts()");

compiler/rustc_borrowck/src/type_check/liveness/trace.rs

@@ -200,7 +200,7 @@ impl<'me, 'typeck, 'flow, 'tcx> LivenessResults<'me, 'typeck, 'flow, 'tcx> {
         for local in boring_locals {
             let local_ty = self.cx.body.local_decls[local].ty;
             let drop_data = self.cx.drop_data.entry(local_ty).or_insert_with({
-                let typeck = &mut self.cx.typeck;
+                let typeck = &self.cx.typeck;
                 move || LivenessContext::compute_drop_data(typeck, local_ty)
             });
 
@@ -542,7 +542,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
         );
 
         let drop_data = self.drop_data.entry(dropped_ty).or_insert_with({
-            let typeck = &mut self.typeck;
+            let typeck = &self.typeck;
             move || Self::compute_drop_data(typeck, dropped_ty)
         });
 
@@ -597,10 +597,7 @@ impl<'tcx> LivenessContext<'_, '_, '_, 'tcx> {
         });
     }
 
-    fn compute_drop_data(
-        typeck: &mut TypeChecker<'_, 'tcx>,
-        dropped_ty: Ty<'tcx>,
-    ) -> DropData<'tcx> {
+    fn compute_drop_data(typeck: &TypeChecker<'_, 'tcx>, dropped_ty: Ty<'tcx>) -> DropData<'tcx> {
         debug!("compute_drop_data(dropped_ty={:?})", dropped_ty,);
 
         match typeck

compiler/rustc_builtin_macros/src/asm.rs

@@ -29,7 +29,7 @@ pub struct AsmArgs {
 }
 
 fn parse_args<'a>(
-    ecx: &mut ExtCtxt<'a>,
+    ecx: &ExtCtxt<'a>,
     sp: Span,
     tts: TokenStream,
     is_global_asm: bool,
@@ -303,7 +303,7 @@ pub fn parse_asm_args<'a>(
 ///
 /// This function must be called immediately after the option token is parsed.
 /// Otherwise, the suggestion will be incorrect.
-fn err_duplicate_option(p: &mut Parser<'_>, symbol: Symbol, span: Span) {
+fn err_duplicate_option(p: &Parser<'_>, symbol: Symbol, span: Span) {
     // Tool-only output
     let full_span = if p.token.kind == token::Comma { span.to(p.token.span) } else { span };
     p.psess.dcx.emit_err(errors::AsmOptAlreadyprovided { span, symbol, full_span });
@@ -315,7 +315,7 @@ fn err_duplicate_option(p: &mut Parser<'_>, symbol: Symbol, span: Span) {
 /// This function must be called immediately after the option token is parsed.
 /// Otherwise, the error will not point to the correct spot.
 fn try_set_option<'a>(
-    p: &mut Parser<'a>,
+    p: &Parser<'a>,
     args: &mut AsmArgs,
     symbol: Symbol,
     option: ast::InlineAsmOptions,

compiler/rustc_builtin_macros/src/assert.rs

@@ -111,7 +111,7 @@ fn expr_if_not(
     cx.expr_if(span, cx.expr(span, ExprKind::Unary(UnOp::Not, cond)), then, els)
 }
 
-fn parse_assert<'a>(cx: &mut ExtCtxt<'a>, sp: Span, stream: TokenStream) -> PResult<'a, Assert> {
+fn parse_assert<'a>(cx: &ExtCtxt<'a>, sp: Span, stream: TokenStream) -> PResult<'a, Assert> {
     let mut parser = cx.new_parser_from_tts(stream);
 
     if parser.token == token::Eof {

compiler/rustc_builtin_macros/src/cfg.rs

@@ -35,7 +35,7 @@ pub fn expand_cfg(
     })
 }
 
-fn parse_cfg<'a>(cx: &mut ExtCtxt<'a>, span: Span, tts: TokenStream) -> PResult<'a, ast::MetaItem> {
+fn parse_cfg<'a>(cx: &ExtCtxt<'a>, span: Span, tts: TokenStream) -> PResult<'a, ast::MetaItem> {
     let mut p = cx.new_parser_from_tts(tts);
 
     if p.token == token::Eof {

compiler/rustc_builtin_macros/src/cfg_accessible.rs

@@ -10,7 +10,7 @@ use rustc_span::Span;
 
 pub(crate) struct Expander;
 
-fn validate_input<'a>(ecx: &mut ExtCtxt<'_>, mi: &'a ast::MetaItem) -> Option<&'a ast::Path> {
+fn validate_input<'a>(ecx: &ExtCtxt<'_>, mi: &'a ast::MetaItem) -> Option<&'a ast::Path> {
     use errors::CfgAccessibleInvalid::*;
     match mi.meta_item_list() {
         None => {}

compiler/rustc_builtin_macros/src/concat_bytes.rs

@@ -8,7 +8,7 @@ use crate::errors;
 
 /// Emits errors for literal expressions that are invalid inside and outside of an array.
 fn invalid_type_err(
-    cx: &mut ExtCtxt<'_>,
+    cx: &ExtCtxt<'_>,
     token_lit: token::Lit,
     span: Span,
     is_nested: bool,
@@ -65,7 +65,7 @@ fn invalid_type_err(
 /// Otherwise, returns `None`, and either pushes the `expr`'s span to `missing_literals` or
 /// updates `guar` accordingly.
 fn handle_array_element(
-    cx: &mut ExtCtxt<'_>,
+    cx: &ExtCtxt<'_>,
     guar: &mut Option<ErrorGuaranteed>,
     missing_literals: &mut Vec<rustc_span::Span>,
     expr: &P<rustc_ast::Expr>,

compiler/rustc_builtin_macros/src/deriving/bounds.rs

@@ -6,7 +6,7 @@ use rustc_expand::base::{Annotatable, ExtCtxt};
 use rustc_span::Span;
 
 pub fn expand_deriving_copy(
-    cx: &mut ExtCtxt<'_>,
+    cx: &ExtCtxt<'_>,
     span: Span,
     mitem: &MetaItem,
     item: &Annotatable,
@@ -29,7 +29,7 @@ pub fn expand_deriving_copy(
 }
 
 pub fn expand_deriving_const_param_ty(
-    cx: &mut ExtCtxt<'_>,
+    cx: &ExtCtxt<'_>,
     span: Span,
     mitem: &MetaItem,
     item: &Annotatable,