Remove unnecessary sigils around Symbol::as_str() calls.

Author: nnethercote

clippy_lints/src/attrs.rs

@@ -486,7 +486,7 @@ fn check_attrs(cx: &LateContext<'_>, span: Span, name: Symbol, attrs: &[Attribut
 
 fn check_semver(cx: &LateContext<'_>, span: Span, lit: &Lit) {
     if let LitKind::Str(is, _) = lit.kind {
-        if Version::parse(&is.as_str()).is_ok() {
+        if Version::parse(is.as_str()).is_ok() {
             return;
         }
     }
@@ -619,7 +619,7 @@ fn check_mismatched_target_os(cx: &EarlyContext<'_>, attr: &Attribute) {
                     MetaItemKind::Word => {
                         if_chain! {
                             if let Some(ident) = meta.ident();
-                            if let Some(os) = find_os(&*ident.name.as_str());
+                            if let Some(os) = find_os(ident.name.as_str());
                             then {
                                 mismatched.push((os, ident.span));
                             }

clippy_lints/src/booleans.rs

@@ -272,7 +272,7 @@ fn simplify_not(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<String> {
                 .copied()
                 .flat_map(|(a, b)| vec![(a, b), (b, a)])
                 .find(|&(a, _)| {
-                    let path: &str = &path.ident.name.as_str();
+                    let path: &str = path.ident.name.as_str();
                     a == path
                 })
                 .and_then(|(_, neg_method)| Some(format!("{}.{}()", snippet_opt(cx, args[0].span)?, neg_method)))

clippy_lints/src/checked_conversions.rs

@@ -321,8 +321,8 @@ fn get_implementing_type<'a>(path: &QPath<'_>, candidates: &'a [&str], function:
         if let TyKind::Path(QPath::Resolved(None, tp)) = &ty.kind;
         if let [int] = &*tp.segments;
         then {
-            let name = &int.ident.name.as_str();
-            candidates.iter().find(|c| name == *c).copied()
+            let name = int.ident.name.as_str();
+            candidates.iter().find(|c| &name == *c).copied()
         } else {
             None
         }
@@ -335,8 +335,8 @@ fn int_ty_to_sym<'tcx>(path: &QPath<'_>) -> Option<&'tcx str> {
         if let QPath::Resolved(_, path) = *path;
         if let [ty] = &*path.segments;
         then {
-            let name = &ty.ident.name.as_str();
-            INTS.iter().find(|c| name == *c).copied()
+            let name = ty.ident.name.as_str();
+            INTS.iter().find(|c| &name == *c).copied()
         } else {
             None
         }

clippy_lints/src/doc.rs

@@ -437,7 +437,7 @@ fn check_attrs<'a>(cx: &LateContext<'_>, valid_idents: &FxHashSet<String>, attrs
 
     for attr in attrs {
         if let AttrKind::DocComment(comment_kind, comment) = attr.kind {
-            let (comment, current_spans) = strip_doc_comment_decoration(&comment.as_str(), comment_kind, attr.span);
+            let (comment, current_spans) = strip_doc_comment_decoration(comment.as_str(), comment_kind, attr.span);
             spans.extend_from_slice(&current_spans);
             doc.push_str(&comment);
         } else if attr.has_name(sym::doc) {

clippy_lints/src/enum_variants.rs

@@ -153,7 +153,7 @@ fn check_variant(
             );
         }
     }
-    let first = &def.variants[0].ident.name.as_str();
+    let first = def.variants[0].ident.name.as_str();
     let mut pre = &first[..str_utils::camel_case_until(&*first).byte_index];
     let mut post = &first[str_utils::camel_case_start(&*first).byte_index..];
     for var in def.variants {

clippy_lints/src/float_literal.rs

@@ -68,7 +68,7 @@ impl<'tcx> LateLintPass<'tcx> for FloatLiteral {
             if let LitKind::Float(sym, lit_float_ty) = lit.node;
             then {
                 let sym_str = sym.as_str();
-                let formatter = FloatFormat::new(&sym_str);
+                let formatter = FloatFormat::new(sym_str);
                 // Try to bail out if the float is for sure fine.
                 // If its within the 2 decimal digits of being out of precision we
                 // check if the parsed representation is the same as the string

clippy_lints/src/floating_point_arithmetic.rs

@@ -696,7 +696,7 @@ impl<'tcx> LateLintPass<'tcx> for FloatingPointArithmetic {
             let recv_ty = cx.typeck_results().expr_ty(&args[0]);
 
             if recv_ty.is_floating_point() {
-                match &*path.ident.name.as_str() {
+                match path.ident.name.as_str() {
                     "ln" => check_ln1p(cx, expr, args),
                     "log" => check_log_base(cx, expr, args),
                     "powf" => check_powf(cx, expr, args),

clippy_lints/src/iter_not_returning_iterator.rs

@@ -42,7 +42,7 @@ declare_lint_pass!(IterNotReturningIterator => [ITER_NOT_RETURNING_ITERATOR]);
 
 impl LateLintPass<'_> for IterNotReturningIterator {
     fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx ImplItem<'tcx>) {
-        let name: &str = &impl_item.ident.name.as_str();
+        let name = impl_item.ident.name.as_str();
         if_chain! {
             if let ImplItemKind::Fn(fn_sig, _) = &impl_item.kind;
             let ret_ty = return_ty(cx, impl_item.hir_id());

clippy_lints/src/loops/needless_collect.rs

@@ -31,7 +31,7 @@ fn check_needless_collect_direct_usage<'tcx>(expr: &'tcx Expr<'_>, cx: &LateCont
             let ty = cx.typeck_results().expr_ty(&args[0]);
             let mut applicability = Applicability::MaybeIncorrect;
             let is_empty_sugg = "next().is_none()".to_string();
-            let method_name = &*method.ident.name.as_str();
+            let method_name = method.ident.name.as_str();
             let sugg = if is_type_diagnostic_item(cx, ty, sym::Vec) ||
                         is_type_diagnostic_item(cx, ty, sym::VecDeque) ||
                         is_type_diagnostic_item(cx, ty, sym::LinkedList) ||
@@ -210,7 +210,7 @@ impl<'tcx> Visitor<'tcx> for IterFunctionVisitor<'_, 'tcx> {
                     if let Some(hir_id) = self.current_statement_hir_id {
                         self.hir_id_uses_map.insert(hir_id, self.uses.len());
                     }
-                    match &*method_name.ident.name.as_str() {
+                    match method_name.ident.name.as_str() {
                         "into_iter" => self.uses.push(Some(IterFunction {
                             func: IterFunctionKind::IntoIter,
                             span: expr.span,

clippy_lints/src/matches.rs

@@ -966,7 +966,7 @@ fn check_wild_err_arm<'tcx>(cx: &LateContext<'tcx>, ex: &Expr<'tcx>, arms: &[Arm
                         for pat in inner.iter() {
                             if let PatKind::Binding(_, id, ident, None) = pat.kind {
                                 if ident.as_str().starts_with('_') && !is_local_used(cx, arm.body, id) {
-                                    ident_bind_name = (&ident.name.as_str()).to_string();
+                                    ident_bind_name = ident.name.as_str().to_string();
                                     matching_wild = true;
                                 }
                             }

clippy_lints/src/methods/mod.rs

@@ -2154,7 +2154,7 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
                 let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
                 wrong_self_convention::check(
                     cx,
-                    &item.ident.name.as_str(),
+                    item.ident.name.as_str(),
                     self_ty,
                     first_arg_ty,
                     first_arg_span,

clippy_lints/src/missing_enforced_import_rename.rs

@@ -75,7 +75,7 @@ impl LateLintPass<'_> for ImportRename {
             if let Some(import) = match snip.split_once(" as ") {
                 None => Some(snip.as_str()),
                 Some((import, rename)) => {
-                    if rename.trim() == &*name.as_str() {
+                    if rename.trim() == name.as_str() {
                         None
                     } else {
                         Some(import.trim())

clippy_lints/src/non_expressive_names.rs

@@ -224,14 +224,14 @@ impl<'a, 'tcx, 'b> SimilarNamesNameVisitor<'a, 'tcx, 'b> {
             match existing_name.len.cmp(&count) {
                 Ordering::Greater => {
                     if existing_name.len - count != 1
-                        || levenstein_not_1(&interned_name, &existing_name.interned.as_str())
+                        || levenstein_not_1(&interned_name, existing_name.interned.as_str())
                     {
                         continue;
                     }
                 },
                 Ordering::Less => {
                     if count - existing_name.len != 1
-                        || levenstein_not_1(&existing_name.interned.as_str(), &interned_name)
+                        || levenstein_not_1(existing_name.interned.as_str(), &interned_name)
                     {
                         continue;
                     }

clippy_lints/src/nonstandard_macro_braces.rs

@@ -104,7 +104,7 @@ fn is_offending_macro<'a>(cx: &EarlyContext<'_>, span: Span, mac_braces: &'a Mac
     };
     if_chain! {
         if let ExpnKind::Macro(MacroKind::Bang, mac_name) = span.ctxt().outer_expn_data().kind;
-        let name = &*mac_name.as_str();
+        let name = mac_name.as_str();
         if let Some(braces) = mac_braces.macro_braces.get(name);
         if let Some(snip) = snippet_opt(cx, span.ctxt().outer_expn_data().call_site);
         // we must check only invocation sites

clippy_lints/src/path_buf_push_overwrite.rs

@@ -53,7 +53,7 @@ impl<'tcx> LateLintPass<'tcx> for PathBufPushOverwrite {
             if let Some(get_index_arg) = args.get(1);
             if let ExprKind::Lit(ref lit) = get_index_arg.kind;
             if let LitKind::Str(ref path_lit, _) = lit.node;
-            if let pushed_path = Path::new(&*path_lit.as_str());
+            if let pushed_path = Path::new(path_lit.as_str());
             if let Some(pushed_path_lit) = pushed_path.to_str();
             if pushed_path.has_root();
             if let Some(root) = pushed_path.components().next();

clippy_lints/src/regex.rs

@@ -150,7 +150,7 @@ fn check_regex<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, utf8: bool) {
 
     if let ExprKind::Lit(ref lit) = expr.kind {
         if let LitKind::Str(ref r, style) = lit.node {
-            let r = &r.as_str();
+            let r = r.as_str();
             let offset = if let StrStyle::Raw(n) = style { 2 + n } else { 1 };
             match parser.parse(r) {
                 Ok(r) => {

clippy_lints/src/stable_sort_primitive.rs

@@ -89,7 +89,7 @@ fn detect_stable_sort_primitive(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option
     if_chain! {
         if let ExprKind::MethodCall(method_name, _, args, _) = &expr.kind;
         if let Some(slice) = &args.get(0);
-        if let Some(method) = SortingKind::from_stable_name(&method_name.ident.name.as_str());
+        if let Some(method) = SortingKind::from_stable_name(method_name.ident.name.as_str());
         if let Some(slice_type) = is_slice_of_primitives(cx, slice);
         then {
             let args_str = args.iter().skip(1).map(|arg| Sugg::hir(cx, arg, "..").to_string()).collect::<Vec<String>>().join(", ");

clippy_lints/src/strings.rs

@@ -330,7 +330,7 @@ impl<'tcx> LateLintPass<'tcx> for StringLitAsBytes {
             if let ExprKind::MethodCall(path, _, [recv], _) = &e.kind;
             if path.ident.name == sym!(into_bytes);
             if let ExprKind::MethodCall(path, _, [recv], _) = &recv.kind;
-            if matches!(&*path.ident.name.as_str(), "to_owned" | "to_string");
+            if matches!(path.ident.name.as_str(), "to_owned" | "to_string");
             if let ExprKind::Lit(lit) = &recv.kind;
             if let LitKind::Str(lit_content, _) = &lit.node;
 

clippy_lints/src/unit_types/unit_cmp.rs

@@ -12,7 +12,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
                 if let ExprKind::Binary(ref cmp, left, _) = expr.kind {
                     let op = cmp.node;
                     if op.is_comparison() && cx.typeck_results().expr_ty(left).is_unit() {
-                        let result = match &*symbol.as_str() {
+                        let result = match symbol.as_str() {
                             "assert_eq" | "debug_assert_eq" => "succeed",
                             "assert_ne" | "debug_assert_ne" => "fail",
                             _ => return,

clippy_lints/src/unused_unit.rs

@@ -94,7 +94,7 @@ impl EarlyLintPass for UnusedUnit {
 
         if_chain! {
             if segments.len() == 1;
-            if ["Fn", "FnMut", "FnOnce"].contains(&&*segments[0].ident.name.as_str());
+            if ["Fn", "FnMut", "FnOnce"].contains(&segments[0].ident.name.as_str());
             if let Some(args) = &segments[0].args;
             if let ast::GenericArgs::Parenthesized(generic_args) = &**args;
             if let ast::FnRetTy::Ty(ty) = &generic_args.output;

clippy_lints/src/write.rs

@@ -371,9 +371,9 @@ impl EarlyLintPass for Write {
 /// Return this and a boolean indicating whether it only consisted of a newline.
 fn newline_span(fmtstr: &StrLit) -> (Span, bool) {
     let sp = fmtstr.span;
-    let contents = &fmtstr.symbol.as_str();
+    let contents = fmtstr.symbol.as_str();
 
-    if *contents == r"\n" {
+    if contents == r"\n" {
         return (sp, true);
     }
 
@@ -484,7 +484,7 @@ impl Write {
             StrStyle::Raw(n) => Some(n as usize),
         };
 
-        let mut parser = Parser::new(&str_sym, style, snippet_opt(cx, str_lit.span), false, ParseMode::Format);
+        let mut parser = Parser::new(str_sym, style, snippet_opt(cx, str_lit.span), false, ParseMode::Format);
         let mut args = SimpleFormatArgs::default();
 
         while let Some(arg) = parser.next() {
@@ -589,7 +589,7 @@ impl Write {
                     lit.token.symbol.as_str().replace('{', "{{").replace('}', "}}")
                 },
                 LitKind::StrRaw(_) | LitKind::Str | LitKind::ByteStrRaw(_) | LitKind::ByteStr => continue,
-                LitKind::Byte | LitKind::Char => match &*lit.token.symbol.as_str() {
+                LitKind::Byte | LitKind::Char => match lit.token.symbol.as_str() {
                     "\"" if matches!(fmtstr.style, StrStyle::Cooked) => "\\\"",
                     "\"" if matches!(fmtstr.style, StrStyle::Raw(0)) => continue,
                     "\\\\" if matches!(fmtstr.style, StrStyle::Raw(_)) => "\\",
@@ -671,7 +671,7 @@ fn check_newlines(fmtstr: &StrLit) -> bool {
     let mut last_was_cr = false;
     let mut should_lint = false;
 
-    let contents = &fmtstr.symbol.as_str();
+    let contents = fmtstr.symbol.as_str();
 
     let mut cb = |r: Range<usize>, c: Result<char, EscapeError>| {
         let c = c.unwrap();

clippy_utils/src/attrs.rs

@@ -113,7 +113,7 @@ pub fn get_attr<'a>(
 fn parse_attrs<F: FnMut(u64)>(sess: &Session, attrs: &[ast::Attribute], name: &'static str, mut f: F) {
     for attr in get_attr(sess, attrs, name) {
         if let Some(ref value) = attr.value_str() {
-            if let Ok(value) = FromStr::from_str(&value.as_str()) {
+            if let Ok(value) = FromStr::from_str(value.as_str()) {
                 f(value);
             } else {
                 sess.span_err(attr.span, "not a number");

clippy_utils/src/eager_or_lazy.rs

@@ -47,7 +47,7 @@ impl ops::BitOrAssign for EagernessSuggestion {
 /// Determine the eagerness of the given function call.
 fn fn_eagerness(cx: &LateContext<'tcx>, fn_id: DefId, name: Symbol, args: &'tcx [Expr<'_>]) -> EagernessSuggestion {
     use EagernessSuggestion::{Eager, Lazy, NoChange};
-    let name = &*name.as_str();
+    let name = name.as_str();
 
     let ty = match cx.tcx.impl_of_method(fn_id) {
         Some(id) => cx.tcx.type_of(id),

clippy_utils/src/qualify_min_const_fn.rs

@@ -372,7 +372,7 @@ fn is_const_fn(tcx: TyCtxt<'_>, def_id: DefId, msrv: Option<&RustcVersion>) -> b
                 // as a part of an unimplemented MSRV check https://github.com/rust-lang/rust/issues/65262.
                 crate::meets_msrv(
                     msrv,
-                    &RustcVersion::parse(&since.as_str())
+                    &RustcVersion::parse(since.as_str())
                         .expect("`rustc_attr::StabilityLevel::Stable::since` is ill-formatted"),
                 )
             } else {