From c54d4ada26c6a92346076bcc27d628398345ed9e Mon Sep 17 00:00:00 2001 From: Takayuki Maeda Date: Sun, 17 Jul 2022 04:09:20 +0900 Subject: [PATCH] avoid some `Symbol` to `String` conversions --- .../src/diagnostics/conflict_errors.rs | 7 +++---- .../src/diagnostics/explain_borrow.rs | 4 ++-- .../src/diagnostics/region_errors.rs | 7 +++---- .../src/diagnostics/region_name.rs | 17 +++++++---------- compiler/rustc_errors/src/diagnostic.rs | 2 +- compiler/rustc_expand/src/module.rs | 5 ++--- .../src/infer/error_reporting/need_type_info.rs | 4 ++-- compiler/rustc_middle/src/ty/layout.rs | 4 ++-- compiler/rustc_middle/src/ty/print/pretty.rs | 12 ++++++------ compiler/rustc_session/src/code_stats.rs | 7 ++++--- compiler/rustc_typeck/src/astconv/mod.rs | 2 +- .../rustc_typeck/src/check/compare_method.rs | 6 +++--- compiler/rustc_typeck/src/check/expr.rs | 2 +- .../rustc_typeck/src/check/method/suggest.rs | 9 +++++---- compiler/rustc_typeck/src/impl_wf_check.rs | 15 +++++---------- src/tools/clippy/clippy_lints/src/format.rs | 2 +- .../clippy_lints/src/inherent_to_string.rs | 2 +- .../src/methods/unnecessary_to_owned.rs | 2 +- 18 files changed, 50 insertions(+), 59 deletions(-) diff --git a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs index b9cfc3732dc7c..146f86e5a1149 100644 --- a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs +++ b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs @@ -23,7 +23,7 @@ use rustc_middle::ty::{ use rustc_mir_dataflow::move_paths::{InitKind, MoveOutIndex, MovePathIndex}; use rustc_span::hygiene::DesugaringKind; use rustc_span::symbol::sym; -use rustc_span::{BytePos, Span}; +use rustc_span::{BytePos, Span, Symbol}; use rustc_trait_selection::infer::InferCtxtExt; use rustc_trait_selection::traits::TraitEngineExt as _; @@ -1227,8 +1227,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> { from_closure: false, region_name: RegionName { - source: - RegionNameSource::AnonRegionFromUpvar(upvar_span, ref upvar_name), + source: RegionNameSource::AnonRegionFromUpvar(upvar_span, upvar_name), .. }, span, @@ -1702,7 +1701,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> { borrow_span: Span, name: &Option, upvar_span: Span, - upvar_name: &str, + upvar_name: Symbol, escape_span: Span, ) -> DiagnosticBuilder<'cx, ErrorGuaranteed> { let tcx = self.infcx.tcx; diff --git a/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs b/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs index 230ccf5199066..72aee0267ac1e 100644 --- a/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs +++ b/compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs @@ -12,7 +12,7 @@ use rustc_middle::mir::{ }; use rustc_middle::ty::adjustment::PointerCast; use rustc_middle::ty::{self, RegionVid, TyCtxt}; -use rustc_span::symbol::Symbol; +use rustc_span::symbol::{kw, Symbol}; use rustc_span::{sym, DesugaringKind, Span}; use crate::region_infer::BlameConstraint; @@ -282,7 +282,7 @@ impl<'tcx> BorrowExplanation<'tcx> { ) { if let ConstraintCategory::OpaqueType = category { let suggestable_name = - if region_name.was_named() { region_name.to_string() } else { "'_".to_string() }; + 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 `{}`", diff --git a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs index 5d3997289bb33..7b2f771288fff 100644 --- a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs +++ b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs @@ -19,8 +19,7 @@ use rustc_middle::ty::subst::InternalSubsts; use rustc_middle::ty::Region; use rustc_middle::ty::TypeVisitor; use rustc_middle::ty::{self, RegionVid, Ty}; -use rustc_span::symbol::sym; -use rustc_span::symbol::Ident; +use rustc_span::symbol::{kw, sym, Ident}; use rustc_span::Span; use crate::borrowck_errors; @@ -758,7 +757,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> { return; }; - let lifetime = if f.has_name() { fr_name.to_string() } else { "'_".to_string() }; + 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), @@ -770,7 +769,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> { self.infcx.tcx, diag, fn_returns, - lifetime, + lifetime.to_string(), Some(arg), captures, Some((param.param_ty_span, param.param_ty.to_string())), diff --git a/compiler/rustc_borrowck/src/diagnostics/region_name.rs b/compiler/rustc_borrowck/src/diagnostics/region_name.rs index e60e11f11df9f..49f8218b222fb 100644 --- a/compiler/rustc_borrowck/src/diagnostics/region_name.rs +++ b/compiler/rustc_borrowck/src/diagnostics/region_name.rs @@ -34,13 +34,13 @@ pub(crate) enum RegionNameSource { /// The `'static` region. Static, /// The free region corresponding to the environment of a closure. - SynthesizedFreeEnvRegion(Span, String), + SynthesizedFreeEnvRegion(Span, &'static str), /// The region corresponding to an argument. AnonRegionFromArgument(RegionNameHighlight), /// The region corresponding to a closure upvar. - AnonRegionFromUpvar(Span, String), + AnonRegionFromUpvar(Span, Symbol), /// The region corresponding to the return type of a closure. - AnonRegionFromOutput(RegionNameHighlight, String), + AnonRegionFromOutput(RegionNameHighlight, &'static str), /// The region from a type yielded by a generator. AnonRegionFromYieldTy(Span, String), /// An anonymous region from an async fn. @@ -110,7 +110,7 @@ impl RegionName { } RegionNameSource::SynthesizedFreeEnvRegion(span, note) => { diag.span_label(*span, format!("lifetime `{self}` represents this closure's body")); - diag.note(note); + diag.note(*note); } RegionNameSource::AnonRegionFromArgument(RegionNameHighlight::CannotMatchHirTy( span, @@ -350,10 +350,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> { Some(RegionName { name: region_name, - source: RegionNameSource::SynthesizedFreeEnvRegion( - fn_decl_span, - note.to_string(), - ), + source: RegionNameSource::SynthesizedFreeEnvRegion(fn_decl_span, note), }) } @@ -678,7 +675,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> { Some(RegionName { name: region_name, - source: RegionNameSource::AnonRegionFromUpvar(upvar_span, upvar_name.to_string()), + source: RegionNameSource::AnonRegionFromUpvar(upvar_span, upvar_name), }) } @@ -756,7 +753,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> { Some(RegionName { name: self.synthesize_region_name(), - source: RegionNameSource::AnonRegionFromOutput(highlight, mir_description.to_string()), + source: RegionNameSource::AnonRegionFromOutput(highlight, mir_description), }) } diff --git a/compiler/rustc_errors/src/diagnostic.rs b/compiler/rustc_errors/src/diagnostic.rs index 9429ad1a89745..449aaac2c7bf0 100644 --- a/compiler/rustc_errors/src/diagnostic.rs +++ b/compiler/rustc_errors/src/diagnostic.rs @@ -496,7 +496,7 @@ impl Diagnostic { self } - pub fn note_trait_signature(&mut self, name: String, signature: String) -> &mut Self { + pub fn note_trait_signature(&mut self, name: Symbol, signature: String) -> &mut Self { self.highlighted_note(vec![ (format!("`{}` from trait: `", name), Style::NoStyle), (signature, Style::Highlight), diff --git a/compiler/rustc_expand/src/module.rs b/compiler/rustc_expand/src/module.rs index 876faad33b678..0315d11634c6b 100644 --- a/compiler/rustc_expand/src/module.rs +++ b/compiler/rustc_expand/src/module.rs @@ -218,10 +218,9 @@ pub fn default_submod_path<'a>( "" }; - let mod_name = ident.name.to_string(); - let default_path_str = format!("{}{}.rs", relative_prefix, mod_name); + let default_path_str = format!("{}{}.rs", relative_prefix, ident.name); let secondary_path_str = - format!("{}{}{}mod.rs", relative_prefix, mod_name, path::MAIN_SEPARATOR); + format!("{}{}{}mod.rs", relative_prefix, ident.name, path::MAIN_SEPARATOR); let default_path = dir_path.join(&default_path_str); let secondary_path = dir_path.join(&secondary_path_str); let default_exists = sess.source_map().file_exists(&default_path); diff --git a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs index 4d29fc469462c..a8e71673c2171 100644 --- a/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs +++ b/compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs @@ -138,7 +138,7 @@ fn fmt_printer<'a, 'tcx>(infcx: &'a InferCtxt<'_, 'tcx>, ns: Namespace) -> FmtPr if let TypeVariableOriginKind::TypeParameterDefinition(name, _) = infcx.inner.borrow_mut().type_variables().var_origin(ty_vid).kind { - Some(name.to_string()) + Some(name) } else { None } @@ -151,7 +151,7 @@ fn fmt_printer<'a, 'tcx>(infcx: &'a InferCtxt<'_, 'tcx>, ns: Namespace) -> FmtPr if let ConstVariableOriginKind::ConstParameterDefinition(name, _) = infcx.inner.borrow_mut().const_unification_table().probe_value(ct_vid).origin.kind { - return Some(name.to_string()); + return Some(name); } else { None } diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs index f87b6e4212d29..a009f143198b3 100644 --- a/compiler/rustc_middle/src/ty/layout.rs +++ b/compiler/rustc_middle/src/ty/layout.rs @@ -1958,7 +1958,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> { min_size = field_end; } FieldInfo { - name: name.to_string(), + name, offset: offset.bytes(), size: field_layout.size.bytes(), align: field_layout.align.abi.bytes(), @@ -1967,7 +1967,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> { .collect(); VariantInfo { - name: n.map(|n| n.to_string()), + name: n, kind: if layout.is_unsized() { SizeKind::Min } else { SizeKind::Exact }, align: layout.align.abi.bytes(), size: if min_size.bytes() == 0 { layout.size.bytes() } else { min_size.bytes() }, diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs index f721a175c9834..14eb7c89b74df 100644 --- a/compiler/rustc_middle/src/ty/print/pretty.rs +++ b/compiler/rustc_middle/src/ty/print/pretty.rs @@ -1030,11 +1030,11 @@ pub trait PrettyPrinter<'tcx>: } } - fn ty_infer_name(&self, _: ty::TyVid) -> Option { + fn ty_infer_name(&self, _: ty::TyVid) -> Option { None } - fn const_infer_name(&self, _: ty::ConstVid<'tcx>) -> Option { + fn const_infer_name(&self, _: ty::ConstVid<'tcx>) -> Option { None } @@ -1550,8 +1550,8 @@ pub struct FmtPrinterData<'a, 'tcx> { pub region_highlight_mode: RegionHighlightMode<'tcx>, - pub ty_infer_name_resolver: Option Option + 'a>>, - pub const_infer_name_resolver: Option) -> Option + 'a>>, + pub ty_infer_name_resolver: Option Option + 'a>>, + pub const_infer_name_resolver: Option) -> Option + 'a>>, } impl<'a, 'tcx> Deref for FmtPrinter<'a, 'tcx> { @@ -1841,11 +1841,11 @@ impl<'tcx> Printer<'tcx> for FmtPrinter<'_, 'tcx> { } impl<'tcx> PrettyPrinter<'tcx> for FmtPrinter<'_, 'tcx> { - fn ty_infer_name(&self, id: ty::TyVid) -> Option { + fn ty_infer_name(&self, id: ty::TyVid) -> Option { self.0.ty_infer_name_resolver.as_ref().and_then(|func| func(id)) } - fn const_infer_name(&self, id: ty::ConstVid<'tcx>) -> Option { + fn const_infer_name(&self, id: ty::ConstVid<'tcx>) -> Option { self.0.const_infer_name_resolver.as_ref().and_then(|func| func(id)) } diff --git a/compiler/rustc_session/src/code_stats.rs b/compiler/rustc_session/src/code_stats.rs index cbb03ffd7a083..eede4d16ea378 100644 --- a/compiler/rustc_session/src/code_stats.rs +++ b/compiler/rustc_session/src/code_stats.rs @@ -1,11 +1,12 @@ use rustc_data_structures::fx::FxHashSet; use rustc_data_structures::sync::Lock; +use rustc_span::Symbol; use rustc_target::abi::{Align, Size}; use std::cmp::{self, Ordering}; #[derive(Clone, PartialEq, Eq, Hash, Debug)] pub struct VariantInfo { - pub name: Option, + pub name: Option, pub kind: SizeKind, pub size: u64, pub align: u64, @@ -20,7 +21,7 @@ pub enum SizeKind { #[derive(Clone, PartialEq, Eq, Hash, Debug)] pub struct FieldInfo { - pub name: String, + pub name: Symbol, pub offset: u64, pub size: u64, pub align: u64, @@ -119,7 +120,7 @@ impl CodeStats { let VariantInfo { ref name, kind: _, align: _, size, ref fields } = *variant_info; let indent = if !struct_like { let name = match name.as_ref() { - Some(name) => name.to_owned(), + Some(name) => name.to_string(), None => i.to_string(), }; println!( diff --git a/compiler/rustc_typeck/src/astconv/mod.rs b/compiler/rustc_typeck/src/astconv/mod.rs index 0a2b54eec47cd..a2ade1d273194 100644 --- a/compiler/rustc_typeck/src/astconv/mod.rs +++ b/compiler/rustc_typeck/src/astconv/mod.rs @@ -2489,7 +2489,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o { concrete type's name `{type_name}` instead if you want to \ specify its type parameters" ), - type_name.to_string(), + type_name, Applicability::MaybeIncorrect, ); } diff --git a/compiler/rustc_typeck/src/check/compare_method.rs b/compiler/rustc_typeck/src/check/compare_method.rs index 2bfb9343877a4..940163a299840 100644 --- a/compiler/rustc_typeck/src/check/compare_method.rs +++ b/compiler/rustc_typeck/src/check/compare_method.rs @@ -546,7 +546,7 @@ fn compare_self_type<'tcx>( if let Some(span) = tcx.hir().span_if_local(trait_m.def_id) { err.span_label(span, format!("trait method declared without `{self_descr}`")); } else { - err.note_trait_signature(trait_m.name.to_string(), trait_m.signature(tcx)); + err.note_trait_signature(trait_m.name, trait_m.signature(tcx)); } let reported = err.emit(); return Err(reported); @@ -566,7 +566,7 @@ fn compare_self_type<'tcx>( if let Some(span) = tcx.hir().span_if_local(trait_m.def_id) { err.span_label(span, format!("`{self_descr}` used in trait")); } else { - err.note_trait_signature(trait_m.name.to_string(), trait_m.signature(tcx)); + err.note_trait_signature(trait_m.name, trait_m.signature(tcx)); } let reported = err.emit(); return Err(reported); @@ -805,7 +805,7 @@ fn compare_number_of_method_arguments<'tcx>( ), ); } else { - err.note_trait_signature(trait_m.name.to_string(), trait_m.signature(tcx)); + err.note_trait_signature(trait_m.name, trait_m.signature(tcx)); } err.span_label( impl_span, diff --git a/compiler/rustc_typeck/src/check/expr.rs b/compiler/rustc_typeck/src/check/expr.rs index 45ea04f234288..6dccb4ae8d648 100644 --- a/compiler/rustc_typeck/src/check/expr.rs +++ b/compiler/rustc_typeck/src/check/expr.rs @@ -1873,7 +1873,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { let remaining_private_fields_len = remaining_private_fields.len(); let names = match &remaining_private_fields .iter() - .map(|(name, _, _)| name.to_string()) + .map(|(name, _, _)| name) .collect::>()[..] { _ if remaining_private_fields_len > 6 => String::new(), diff --git a/compiler/rustc_typeck/src/check/method/suggest.rs b/compiler/rustc_typeck/src/check/method/suggest.rs index 7bf167426f748..7f96e421a9ae3 100644 --- a/compiler/rustc_typeck/src/check/method/suggest.rs +++ b/compiler/rustc_typeck/src/check/method/suggest.rs @@ -19,6 +19,7 @@ use rustc_middle::ty::print::with_crate_prefix; use rustc_middle::ty::ToPolyTraitRef; use rustc_middle::ty::{self, DefIdTree, ToPredicate, Ty, TyCtxt, TypeVisitable}; use rustc_span::symbol::{kw, sym, Ident}; +use rustc_span::Symbol; use rustc_span::{lev_distance, source_map, ExpnKind, FileName, MacroKind, Span}; use rustc_trait_selection::traits::error_reporting::on_unimplemented::InferCtxtExt as _; use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _; @@ -1548,7 +1549,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { Option>, )], ) { - let mut derives = Vec::<(String, Span, String)>::new(); + let mut derives = Vec::<(String, Span, Symbol)>::new(); let mut traits = Vec::::new(); for (pred, _, _) in unsatisfied_predicates { let ty::PredicateKind::Trait(trait_pred) = pred.kind().skip_binder() else { continue }; @@ -1581,12 +1582,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { derives.push(( self_name.clone(), self_span, - parent_diagnostic_name.to_string(), + parent_diagnostic_name, )); } } } - derives.push((self_name, self_span, diagnostic_name.to_string())); + derives.push((self_name, self_span, diagnostic_name)); } else { traits.push(self.tcx.def_span(trait_pred.def_id())); } @@ -1609,7 +1610,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { continue; } } - derives_grouped.push((self_name, self_span, trait_name)); + derives_grouped.push((self_name, self_span, trait_name.to_string())); } let len = traits.len(); diff --git a/compiler/rustc_typeck/src/impl_wf_check.rs b/compiler/rustc_typeck/src/impl_wf_check.rs index e7ca70de4ba71..8c26c96816d9b 100644 --- a/compiler/rustc_typeck/src/impl_wf_check.rs +++ b/compiler/rustc_typeck/src/impl_wf_check.rs @@ -17,7 +17,7 @@ use rustc_hir::def::DefKind; use rustc_hir::def_id::LocalDefId; use rustc_middle::ty::query::Providers; use rustc_middle::ty::{self, TyCtxt, TypeVisitable}; -use rustc_span::Span; +use rustc_span::{Span, Symbol}; use std::collections::hash_map::Entry::{Occupied, Vacant}; @@ -123,12 +123,7 @@ fn enforce_impl_params_are_constrained(tcx: TyCtxt<'_>, impl_def_id: LocalDefId) ty::GenericParamDefKind::Type { .. } => { let param_ty = ty::ParamTy::for_def(param); if !input_parameters.contains(&cgp::Parameter::from(param_ty)) { - report_unused_parameter( - tcx, - tcx.def_span(param.def_id), - "type", - ¶m_ty.to_string(), - ); + report_unused_parameter(tcx, tcx.def_span(param.def_id), "type", param_ty.name); } } ty::GenericParamDefKind::Lifetime => { @@ -140,7 +135,7 @@ fn enforce_impl_params_are_constrained(tcx: TyCtxt<'_>, impl_def_id: LocalDefId) tcx, tcx.def_span(param.def_id), "lifetime", - ¶m.name.to_string(), + param.name, ); } } @@ -151,7 +146,7 @@ fn enforce_impl_params_are_constrained(tcx: TyCtxt<'_>, impl_def_id: LocalDefId) tcx, tcx.def_span(param.def_id), "const", - ¶m_ct.to_string(), + param_ct.name, ); } } @@ -178,7 +173,7 @@ fn enforce_impl_params_are_constrained(tcx: TyCtxt<'_>, impl_def_id: LocalDefId) // used elsewhere are not projected back out. } -fn report_unused_parameter(tcx: TyCtxt<'_>, span: Span, kind: &str, name: &str) { +fn report_unused_parameter(tcx: TyCtxt<'_>, span: Span, kind: &str, name: Symbol) { let mut err = struct_span_err!( tcx.sess, span, diff --git a/src/tools/clippy/clippy_lints/src/format.rs b/src/tools/clippy/clippy_lints/src/format.rs index 3084c70589fa3..0aa085fc71bfe 100644 --- a/src/tools/clippy/clippy_lints/src/format.rs +++ b/src/tools/clippy/clippy_lints/src/format.rs @@ -82,7 +82,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessFormat { then { let is_new_string = match value.kind { ExprKind::Binary(..) => true, - ExprKind::MethodCall(path, ..) => path.ident.name.as_str() == "to_string", + ExprKind::MethodCall(path, ..) => path.ident.name == sym::to_string, _ => false, }; let sugg = if format_args.format_string_span.contains(value.span) { diff --git a/src/tools/clippy/clippy_lints/src/inherent_to_string.rs b/src/tools/clippy/clippy_lints/src/inherent_to_string.rs index 39f68a8a1b480..694f646c707cc 100644 --- a/src/tools/clippy/clippy_lints/src/inherent_to_string.rs +++ b/src/tools/clippy/clippy_lints/src/inherent_to_string.rs @@ -98,7 +98,7 @@ impl<'tcx> LateLintPass<'tcx> for InherentToString { if_chain! { // Check if item is a method, called to_string and has a parameter 'self' if let ImplItemKind::Fn(ref signature, _) = impl_item.kind; - if impl_item.ident.name.as_str() == "to_string"; + if impl_item.ident.name == sym::to_string; let decl = &signature.decl; if decl.implicit_self.has_implicit_self(); if decl.inputs.len() == 1; diff --git a/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs b/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs index b4c6bfb31ed1c..b3276f1394ed2 100644 --- a/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs +++ b/src/tools/clippy/clippy_lints/src/methods/unnecessary_to_owned.rs @@ -427,5 +427,5 @@ fn is_cow_into_owned(cx: &LateContext<'_>, method_name: Symbol, method_def_id: D /// Returns true if the named method is `ToString::to_string`. fn is_to_string(cx: &LateContext<'_>, method_name: Symbol, method_def_id: DefId) -> bool { - method_name.as_str() == "to_string" && is_diag_trait_item(cx, method_def_id, sym::ToString) + method_name == sym::to_string && is_diag_trait_item(cx, method_def_id, sym::ToString) }