use &str / String literals instead of format!()

Author: matthiaskrgr

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -649,7 +649,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         if !assign_value.is_empty() {
             err.span_suggestion_verbose(
                 sugg_span.shrink_to_hi(),
-                format!("consider assigning a value"),
+                "consider assigning a value",
                 format!(" = {}", assign_value),
                 Applicability::MaybeIncorrect,
             );

compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs

@@ -270,7 +270,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
                 for extra in extra_info {
                     match extra {
                         ExtraConstraintInfo::PlaceholderFromPredicate(span) => {
-                            err.span_note(*span, format!("due to current limitations in the borrow checker, this implies a `'static` lifetime"));
+                            err.span_note(*span, "due to current limitations in the borrow checker, this implies a `'static` lifetime");
                         }
                     }
                 }

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -472,7 +472,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
         for extra in extra_info {
             match extra {
                 ExtraConstraintInfo::PlaceholderFromPredicate(span) => {
-                    diag.span_note(span, format!("due to current limitations in the borrow checker, this implies a `'static` lifetime"));
+                    diag.span_note(span, "due to current limitations in the borrow checker, this implies a `'static` lifetime");
                 }
             }
         }

compiler/rustc_codegen_llvm/src/asm.rs

@@ -144,7 +144,7 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                     // We prefer the latter because it matches the behavior of
                     // Clang.
                     if late && matches!(reg, InlineAsmRegOrRegClass::Reg(_)) {
-                        constraints.push(format!("{}", reg_to_llvm(reg, Some(&in_value.layout))));
+                        constraints.push(reg_to_llvm(reg, Some(&in_value.layout)).to_string());
                     } else {
                         constraints.push(format!("{}", op_idx[&idx]));
                     }

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -2240,7 +2240,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                     ),
                     "s",
                 ),
-                [only] => (format!("{only}"), ""),
+                [only] => (only.to_string(), ""),
                 [] => unreachable!(),
             };
             let last_span = *arg_spans.last().unwrap();

compiler/rustc_hir_typeck/src/demand.rs

@@ -406,7 +406,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     }
 
                     let note_about_variant_field_privacy = (field_is_local && !field_is_accessible)
-                        .then(|| format!(" (its field is private, but it's local to this crate and its privacy can be changed)"));
+                        .then(|| " (its field is private, but it's local to this crate and its privacy can be changed)".to_string());
 
                     let sole_field_ty = sole_field.ty(self.tcx, substs);
                     if self.can_coerce(expr_ty, sole_field_ty) {

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -1013,7 +1013,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             } else {
                                 args_span
                             };
-                            labels.push((span, format!("multiple arguments are missing")));
+                            labels.push((span, "multiple arguments are missing".to_string()));
                             suggestion_text = match suggestion_text {
                                 SuggestionText::None | SuggestionText::Provide(_) => {
                                     SuggestionText::Provide(true)

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -319,11 +319,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
             }
 
-            err.multipart_suggestion_verbose(
-                format!("use parentheses to call these"),
-                sugg,
-                applicability,
-            );
+            err.multipart_suggestion_verbose("use parentheses to call these", sugg, applicability);
 
             true
         } else {

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -1007,7 +1007,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         if def_kind == DefKind::AssocFn && lev_candidate.fn_has_self_parameter {
                             err.span_suggestion(
                                 span,
-                                &format!("there is a method with a similar name",),
+                                "there is a method with a similar name",
                                 lev_candidate.name,
                                 Applicability::MaybeIncorrect,
                             );

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -184,7 +184,7 @@ fn msg_span_from_early_bound_and_free_regions<'tcx>(
             let text = if br.has_name() {
                 format!("the lifetime `{}` as defined here", br.name)
             } else {
-                format!("the anonymous lifetime as defined here")
+                "the anonymous lifetime as defined here".to_string()
             };
             (text, sp)
         }
@@ -203,7 +203,7 @@ fn msg_span_from_early_bound_and_free_regions<'tcx>(
                             sp = param.span;
                         }
                         let text = if name == kw::UnderscoreLifetime {
-                            format!("the anonymous lifetime as defined here")
+                            "the anonymous lifetime as defined here".to_string()
                         } else {
                             format!("the lifetime `{}` as defined here", name)
                         };