Rollup of 11 pull requests

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -156,7 +156,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 err.span_note(
                     MultiSpan::from_spans(reinit_spans),
                     &if reinits <= 3 {
-                        format!("these {} reinitializations might get skipped", reinits)
+                        format!("these {reinits} reinitializations might get skipped")
                     } else {
                         format!(
                             "these 3 reinitializations and {} other{} might get skipped",
@@ -225,9 +225,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 err.span_label(
                     span,
                     format!(
-                        "value {} here after {}move",
+                        "value {} here after {partial_str}move",
                         desired_action.as_verb_in_past_tense(),
-                        partial_str
                     ),
                 );
             }
@@ -257,7 +256,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         &format!(
                             "consider creating a fresh reborrow of {} here",
                             self.describe_place(moved_place)
-                                .map(|n| format!("`{}`", n))
+                                .map(|n| format!("`{n}`"))
                                 .unwrap_or_else(|| "the mutable reference".to_string()),
                         ),
                         "&mut *",
@@ -271,7 +270,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 DescribePlaceOpt { including_downcast: true, including_tuple_field: true },
             );
             let note_msg = match opt_name {
-                Some(name) => format!("`{}`", name),
+                Some(name) => format!("`{name}`"),
                 None => "value".to_owned(),
             };
             if self.suggest_borrow_fn_like(&mut err, ty, &move_site_vec, &note_msg) {
@@ -297,9 +296,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             } = use_spans
             {
                 err.note(&format!(
-                    "{} occurs due to deref coercion to `{}`",
+                    "{} occurs due to deref coercion to `{deref_target_ty}`",
                     desired_action.as_noun(),
-                    deref_target_ty
                 ));
 
                 // Check first whether the source is accessible (issue #87060)

compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs

@@ -77,7 +77,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
                     if borrow_span.map(|sp| !sp.overlaps(var_or_use_span)).unwrap_or(true) {
                         err.span_label(
                             var_or_use_span,
-                            format!("{}borrow later {}", borrow_desc, message),
+                            format!("{borrow_desc}borrow later {message}"),
                         );
                     }
                 } else {
@@ -90,7 +90,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
                         let capture_kind_label = message;
                         err.span_label(
                             var_or_use_span,
-                            format!("{}borrow later {}", borrow_desc, capture_kind_label),
+                            format!("{borrow_desc}borrow later {capture_kind_label}"),
                         );
                         err.span_label(path_span, path_label);
                     }
@@ -110,7 +110,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
                 };
                 // We can use `var_or_use_span` if either `path_span` is not present, or both spans are the same
                 if path_span.map(|path_span| path_span == var_or_use_span).unwrap_or(true) {
-                    err.span_label(var_or_use_span, format!("{}{}", borrow_desc, message));
+                    err.span_label(var_or_use_span, format!("{borrow_desc}{message}"));
                 } else {
                     // path_span must be `Some` as otherwise the if condition is true
                     let path_span = path_span.unwrap();
@@ -121,7 +121,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
                         let capture_kind_label = message;
                         err.span_label(
                             var_or_use_span,
-                            format!("{}borrow later {}", borrow_desc, capture_kind_label),
+                            format!("{borrow_desc}borrow later {capture_kind_label}"),
                         );
                         err.span_label(path_span, path_label);
                     }
@@ -160,12 +160,8 @@ impl<'tcx> BorrowExplanation<'tcx> {
                 match local_names[dropped_local] {
                     Some(local_name) if !local_decl.from_compiler_desugaring() => {
                         let message = format!(
-                            "{B}borrow might be used here, when `{LOC}` is dropped \
-                             and runs the {DTOR} for {TYPE}",
-                            B = borrow_desc,
-                            LOC = local_name,
-                            TYPE = type_desc,
-                            DTOR = dtor_desc
+                            "{borrow_desc}borrow might be used here, when `{local_name}` is dropped \
+                             and runs the {dtor_desc} for {type_desc}",
                         );
                         err.span_label(body.source_info(drop_loc).span, message);
 
@@ -180,18 +176,14 @@ impl<'tcx> BorrowExplanation<'tcx> {
                         err.span_label(
                             local_decl.source_info.span,
                             format!(
-                                "a temporary with access to the {B}borrow \
+                                "a temporary with access to the {borrow_desc}borrow \
                                  is created here ...",
-                                B = borrow_desc
                             ),
                         );
                         let message = format!(
-                            "... and the {B}borrow might be used here, \
+                            "... and the {borrow_desc}borrow might be used here, \
                              when that temporary is dropped \
-                             and runs the {DTOR} for {TYPE}",
-                            B = borrow_desc,
-                            TYPE = type_desc,
-                            DTOR = dtor_desc
+                             and runs the {dtor_desc} for {type_desc}",
                         );
                         err.span_label(body.source_info(drop_loc).span, message);
 
@@ -249,20 +241,16 @@ impl<'tcx> BorrowExplanation<'tcx> {
                     err.span_label(
                         span,
                         format!(
-                            "{}requires that `{}` is borrowed for `{}`",
+                            "{}requires that `{desc}` is borrowed for `{region_name}`",
                             category.description(),
-                            desc,
-                            region_name,
                         ),
                     );
                 } else {
                     err.span_label(
                         span,
                         format!(
-                            "{}requires that {}borrow lasts for `{}`",
+                            "{}requires that {borrow_desc}borrow lasts for `{region_name}`",
                             category.description(),
-                            borrow_desc,
-                            region_name,
                         ),
                     );
                 };
@@ -296,15 +284,14 @@ impl<'tcx> BorrowExplanation<'tcx> {
                 if region_name.was_named() { region_name.name } else { kw::UnderscoreLifetime };
 
             let msg = format!(
-                "you can add a bound to the {}to make it last less than `'static` and match `{}`",
+                "you can add a bound to the {}to make it last less than `'static` and match `{region_name}`",
                 category.description(),
-                region_name,
             );
 
             err.span_suggestion_verbose(
                 span.shrink_to_hi(),
                 &msg,
-                format!(" + {}", suggestable_name),
+                format!(" + {suggestable_name}"),
                 Applicability::Unspecified,
             );
         }

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -403,8 +403,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         move_prefix: &str,
     ) {
         let message = format!(
-            "{}move occurs because {} has type `{}`, which does not implement the `Copy` trait",
-            move_prefix, place_desc, ty,
+            "{move_prefix}move occurs because {place_desc} has type `{ty}`, which does not implement the `Copy` trait",
         );
         if let Some(span) = span {
             err.span_label(span, message);
@@ -739,11 +738,11 @@ impl<'tcx> BorrowedContentSource<'tcx> {
             BorrowedContentSource::OverloadedDeref(ty) => ty
                 .ty_adt_def()
                 .and_then(|adt| match tcx.get_diagnostic_name(adt.did())? {
-                    name @ (sym::Rc | sym::Arc) => Some(format!("an `{}`", name)),
+                    name @ (sym::Rc | sym::Arc) => Some(format!("an `{name}`")),
                     _ => None,
                 })
-                .unwrap_or_else(|| format!("dereference of `{}`", ty)),
-            BorrowedContentSource::OverloadedIndex(ty) => format!("index of `{}`", ty),
+                .unwrap_or_else(|| format!("dereference of `{ty}`")),
+            BorrowedContentSource::OverloadedIndex(ty) => format!("index of `{ty}`"),
         }
     }
 
@@ -769,11 +768,11 @@ impl<'tcx> BorrowedContentSource<'tcx> {
             BorrowedContentSource::OverloadedDeref(ty) => ty
                 .ty_adt_def()
                 .and_then(|adt| match tcx.get_diagnostic_name(adt.did())? {
-                    name @ (sym::Rc | sym::Arc) => Some(format!("an `{}`", name)),
+                    name @ (sym::Rc | sym::Arc) => Some(format!("an `{name}`")),
                     _ => None,
                 })
-                .unwrap_or_else(|| format!("dereference of `{}`", ty)),
-            BorrowedContentSource::OverloadedIndex(ty) => format!("an index of `{}`", ty),
+                .unwrap_or_else(|| format!("dereference of `{ty}`")),
+            BorrowedContentSource::OverloadedIndex(ty) => format!("an index of `{ty}`"),
         }
     }
 
@@ -1033,7 +1032,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         if let UseSpans::FnSelfUse { var_span, fn_call_span, fn_span, kind } = move_spans {
             let place_name = self
                 .describe_place(moved_place.as_ref())
-                .map(|n| format!("`{}`", n))
+                .map(|n| format!("`{n}`"))
                 .unwrap_or_else(|| "value".to_owned());
             match kind {
                 CallKind::FnCall { fn_trait_id, .. }
@@ -1042,8 +1041,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     err.span_label(
                         fn_call_span,
                         &format!(
-                            "{} {}moved due to this call{}",
-                            place_name, partially_str, loop_message
+                            "{place_name} {partially_str}moved due to this call{loop_message}",
                         ),
                     );
                     err.span_note(
@@ -1056,8 +1054,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     err.span_label(
                         fn_call_span,
                         &format!(
-                            "{} {}moved due to usage in operator{}",
-                            place_name, partially_str, loop_message
+                            "{place_name} {partially_str}moved due to usage in operator{loop_message}",
                         ),
                     );
                     if self.fn_self_span_reported.insert(fn_span) {
@@ -1089,9 +1086,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                             err.span_suggestion_verbose(
                                 move_span.shrink_to_lo(),
                                 &format!(
-                                    "consider iterating over a slice of the `{}`'s content to \
+                                    "consider iterating over a slice of the `{ty}`'s content to \
                                      avoid moving into the `for` loop",
-                                    ty,
                                 ),
                                 "&",
                                 Applicability::MaybeIncorrect,
@@ -1101,8 +1097,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         err.span_label(
                             fn_call_span,
                             &format!(
-                                "{} {}moved due to this implicit call to `.into_iter()`{}",
-                                place_name, partially_str, loop_message
+                                "{place_name} {partially_str}moved due to this implicit call to `.into_iter()`{loop_message}",
                             ),
                         );
                         // If the moved place was a `&mut` ref, then we can
@@ -1118,7 +1113,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                                     &format!(
                                         "consider creating a fresh reborrow of {} here",
                                         self.describe_place(moved_place.as_ref())
-                                            .map(|n| format!("`{}`", n))
+                                            .map(|n| format!("`{n}`"))
                                             .unwrap_or_else(|| "the mutable reference".to_string()),
                                     ),
                                     "&mut *",
@@ -1130,8 +1125,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         err.span_label(
                             fn_call_span,
                             &format!(
-                                "{} {}moved due to this method call{}",
-                                place_name, partially_str, loop_message
+                                "{place_name} {partially_str}moved due to this method call{loop_message}",
                             ),
                         );
                         let infcx = tcx.infer_ctxt().build();
@@ -1206,15 +1200,15 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             if move_span != span || !loop_message.is_empty() {
                 err.span_label(
                     move_span,
-                    format!("value {}moved{} here{}", partially_str, move_msg, loop_message),
+                    format!("value {partially_str}moved{move_msg} here{loop_message}"),
                 );
             }
             // If the move error occurs due to a loop, don't show
             // another message for the same span
             if loop_message.is_empty() {
                 move_spans.var_span_label(
                     err,
-                    format!("variable {}moved due to use{}", partially_str, move_spans.describe()),
+                    format!("variable {partially_str}moved due to use{}", move_spans.describe()),
                     "moved",
                 );
             }

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -264,7 +264,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                         ProjectionElem::Deref,
                     ],
             } => {
-                err.span_label(span, format!("cannot {ACT}", ACT = act));
+                err.span_label(span, format!("cannot {act}"));
 
                 if let Some(span) = get_mut_span_in_struct_field(
                     self.infcx.tcx,
@@ -290,7 +290,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                     .unwrap_or(false) =>
             {
                 let decl = &self.body.local_decls[local];
-                err.span_label(span, format!("cannot {ACT}", ACT = act));
+                err.span_label(span, format!("cannot {act}"));
                 if let Some(mir::Statement {
                     source_info,
                     kind:
@@ -639,7 +639,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
             }
 
             PlaceRef { local: _, projection: [.., ProjectionElem::Deref] } => {
-                err.span_label(span, format!("cannot {ACT}", ACT = act));
+                err.span_label(span, format!("cannot {act}"));
 
                 match opt_source {
                     Some(BorrowedContentSource::OverloadedDeref(ty)) => {
@@ -1212,7 +1212,7 @@ fn suggest_ampmut<'tcx>(
     {
         let lt_name = &src[1..ws_pos];
         let ty = &src[ws_pos..];
-        return (true, highlight_span, format!("&{} mut{}", lt_name, ty));
+        return (true, highlight_span, format!("&{lt_name} mut{ty}"));
     }
 
     let ty_mut = local_decl.ty.builtin_deref(true).unwrap();

compiler/rustc_borrowck/src/diagnostics/outlives_suggestion.rs

@@ -209,14 +209,14 @@ impl OutlivesSuggestionBuilder {
         let mut diag = if suggested.len() == 1 {
             mbcx.infcx.tcx.sess.diagnostic().struct_help(&match suggested.last().unwrap() {
                 SuggestedConstraint::Outlives(a, bs) => {
-                    let bs: SmallVec<[String; 2]> = bs.iter().map(|r| format!("{}", r)).collect();
-                    format!("add bound `{}: {}`", a, bs.join(" + "))
+                    let bs: SmallVec<[String; 2]> = bs.iter().map(|r| r.to_string()).collect();
+                    format!("add bound `{a}: {}`", bs.join(" + "))
                 }
 
                 SuggestedConstraint::Equal(a, b) => {
-                    format!("`{}` and `{}` must be the same: replace one with the other", a, b)
+                    format!("`{a}` and `{b}` must be the same: replace one with the other")
                 }
-                SuggestedConstraint::Static(a) => format!("replace `{}` with `'static`", a),
+                SuggestedConstraint::Static(a) => format!("replace `{a}` with `'static`"),
             })
         } else {
             // Create a new diagnostic.
@@ -231,18 +231,16 @@ impl OutlivesSuggestionBuilder {
             for constraint in suggested {
                 match constraint {
                     SuggestedConstraint::Outlives(a, bs) => {
-                        let bs: SmallVec<[String; 2]> =
-                            bs.iter().map(|r| format!("{}", r)).collect();
-                        diag.help(&format!("add bound `{}: {}`", a, bs.join(" + ")));
+                        let bs: SmallVec<[String; 2]> = bs.iter().map(|r| r.to_string()).collect();
+                        diag.help(&format!("add bound `{a}: {}`", bs.join(" + ")));
                     }
                     SuggestedConstraint::Equal(a, b) => {
                         diag.help(&format!(
-                            "`{}` and `{}` must be the same: replace one with the other",
-                            a, b
+                            "`{a}` and `{b}` must be the same: replace one with the other",
                         ));
                     }
                     SuggestedConstraint::Static(a) => {
-                        diag.help(&format!("replace `{}` with `'static`", a));
+                        diag.help(&format!("replace `{a}` with `'static`"));
                     }
                 }
             }

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -422,7 +422,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                         );
                         (desc, note)
                     }
-                    _ => panic!("Unexpected type {:?}", ty),
+                    _ => panic!("Unexpected type {ty:?}"),
                 };
                 diag.note(&format!("requirement occurs because of {desc}",));
                 diag.note(&note);
@@ -725,10 +725,10 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
             let lifetime = if f.has_name() { fr_name.name } else { kw::UnderscoreLifetime };
 
             let arg = match param.param.pat.simple_ident() {
-                Some(simple_ident) => format!("argument `{}`", simple_ident),
+                Some(simple_ident) => format!("argument `{simple_ident}`"),
                 None => "the argument".to_string(),
             };
-            let captures = format!("captures data from {}", arg);
+            let captures = format!("captures data from {arg}");
 
             return nice_region_error::suggest_new_region_bound(
                 self.infcx.tcx,