Rollup merge of rust-lang#65776 - nnethercote:rename-LocalInternedString-and-more, r=estebank

Rename `LocalInternedString` and more

This PR renames `LocalInternedString` as `SymbolStr`, removes an unnecessary `impl` from it, improves comments, and cleans up some `SymbolStr` uses.

r? @estebank

Author: Centril

src/librustc/dep_graph/dep_node.rs

@@ -525,7 +525,7 @@ impl<'tcx> DepNodeParams<'tcx> for CrateNum {
     }
 
     fn to_debug_str(&self, tcx: TyCtxt<'tcx>) -> String {
-        tcx.crate_name(*self).as_str().to_string()
+        tcx.crate_name(*self).to_string()
     }
 }
 

src/librustc/hir/lowering.rs

@@ -3382,7 +3382,7 @@ pub fn is_range_literal(sess: &Session, expr: &hir::Expr) -> bool {
     // either in std or core, i.e. has either a `::std::ops::Range` or
     // `::core::ops::Range` prefix.
     fn is_range_path(path: &Path) -> bool {
-        let segs: Vec<_> = path.segments.iter().map(|seg| seg.ident.as_str().to_string()).collect();
+        let segs: Vec<_> = path.segments.iter().map(|seg| seg.ident.to_string()).collect();
         let segs: Vec<_> = segs.iter().map(|seg| &**seg).collect();
 
         // "{{root}}" is the equivalent of `::` prefix in `Path`.
@@ -3423,7 +3423,7 @@ pub fn is_range_literal(sess: &Session, expr: &hir::Expr) -> bool {
         ExprKind::Call(ref func, _) => {
             if let ExprKind::Path(QPath::TypeRelative(ref ty, ref segment)) = func.kind {
                 if let TyKind::Path(QPath::Resolved(None, ref path)) = ty.kind {
-                    let new_call = segment.ident.as_str() == "new";
+                    let new_call = segment.ident.name == sym::new;
                     return is_range_path(&path) && is_lit(sess, &expr.span) && new_call;
                 }
             }

src/librustc/hir/print.rs

@@ -564,7 +564,7 @@ impl<'a> State<'a> {
             }
             hir::ItemKind::GlobalAsm(ref ga) => {
                 self.head(visibility_qualified(&item.vis, "global asm"));
-                self.s.word(ga.asm.as_str().to_string());
+                self.s.word(ga.asm.to_string());
                 self.end()
             }
             hir::ItemKind::TyAlias(ref ty, ref generics) => {
@@ -1855,7 +1855,7 @@ impl<'a> State<'a> {
         self.commasep(Inconsistent, &decl.inputs, |s, ty| {
             s.ibox(INDENT_UNIT);
             if let Some(arg_name) = arg_names.get(i) {
-                s.s.word(arg_name.as_str().to_string());
+                s.s.word(arg_name.to_string());
                 s.s.word(":");
                 s.s.space();
             } else if let Some(body_id) = body_id {

src/librustc/ich/impls_syntax.rs

@@ -9,7 +9,7 @@ use std::mem;
 use syntax::ast;
 use syntax::feature_gate;
 use syntax::parse::token;
-use syntax::symbol::LocalInternedString;
+use syntax::symbol::SymbolStr;
 use syntax::tokenstream;
 use syntax_pos::SourceFile;
 
@@ -18,21 +18,21 @@ use crate::hir::def_id::{DefId, CrateNum, CRATE_DEF_INDEX};
 use smallvec::SmallVec;
 use rustc_data_structures::stable_hasher::{HashStable, ToStableHashKey, StableHasher};
 
-impl<'a> HashStable<StableHashingContext<'a>> for LocalInternedString {
+impl<'a> HashStable<StableHashingContext<'a>> for SymbolStr {
     #[inline]
     fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
         let str = self as &str;
         str.hash_stable(hcx, hasher)
     }
 }
 
-impl<'a> ToStableHashKey<StableHashingContext<'a>> for LocalInternedString {
-    type KeyType = LocalInternedString;
+impl<'a> ToStableHashKey<StableHashingContext<'a>> for SymbolStr {
+    type KeyType = SymbolStr;
 
     #[inline]
     fn to_stable_hash_key(&self,
                           _: &StableHashingContext<'a>)
-                          -> LocalInternedString {
+                          -> SymbolStr {
         self.clone()
     }
 }
@@ -45,12 +45,12 @@ impl<'a> HashStable<StableHashingContext<'a>> for ast::Name {
 }
 
 impl<'a> ToStableHashKey<StableHashingContext<'a>> for ast::Name {
-    type KeyType = LocalInternedString;
+    type KeyType = SymbolStr;
 
     #[inline]
     fn to_stable_hash_key(&self,
                           _: &StableHashingContext<'a>)
-                          -> LocalInternedString {
+                          -> SymbolStr {
         self.as_str()
     }
 }

src/librustc/mir/mono.rs

@@ -486,7 +486,7 @@ impl CodegenUnitNameBuilder<'tcx> {
         if self.tcx.sess.opts.debugging_opts.human_readable_cgu_names {
             cgu_name
         } else {
-            let cgu_name = &cgu_name.as_str()[..];
+            let cgu_name = &cgu_name.as_str();
             Symbol::intern(&CodegenUnit::mangle_name(cgu_name))
         }
     }

src/librustc/traits/error_reporting.rs

@@ -1130,7 +1130,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     let restrict_msg = "consider further restricting this bound";
                     let param_name = self_ty.to_string();
                     for param in generics.params.iter().filter(|p| {
-                        &param_name == std::convert::AsRef::<str>::as_ref(&p.name.ident().as_str())
+                        p.name.ident().as_str() == param_name
                     }) {
                         if param_name.starts_with("impl ") {
                             // `impl Trait` in argument:

src/librustc/traits/on_unimplemented.rs

@@ -180,7 +180,7 @@ impl<'tcx> OnUnimplementedDirective {
                     c.ident().map_or(false, |ident| {
                         options.contains(&(
                             ident.name,
-                            c.value_str().map(|s| s.as_str().to_string())
+                            c.value_str().map(|s| s.to_string())
                         ))
                     })
                 }) {

src/librustc/ty/query/on_disk_cache.rs

@@ -264,7 +264,7 @@ impl<'sess> OnDiskCache<'sess> {
             let sorted_cnums = sorted_cnums_including_local_crate(tcx);
             let prev_cnums: Vec<_> = sorted_cnums.iter()
                 .map(|&cnum| {
-                    let crate_name = tcx.original_crate_name(cnum).as_str().to_string();
+                    let crate_name = tcx.original_crate_name(cnum).to_string();
                     let crate_disambiguator = tcx.crate_disambiguator(cnum);
                     (cnum.as_u32(), crate_name, crate_disambiguator)
                 })

src/librustc_codegen_llvm/attributes.rs

@@ -314,7 +314,7 @@ pub fn from_fn_attrs(
             codegen_fn_attrs.target_features
                 .iter()
                 .map(|f| {
-                    let feature = &*f.as_str();
+                    let feature = &f.as_str();
                     format!("+{}", llvm_util::to_llvm_feature(cx.tcx.sess, feature))
                 })
         )

src/librustc_codegen_llvm/debuginfo/namespace.rs

@@ -34,11 +34,11 @@ pub fn item_namespace(cx: &CodegenCx<'ll, '_>, def_id: DefId) -> &'ll DIScope {
     });
 
     let namespace_name = match def_key.disambiguated_data.data {
-        DefPathData::CrateRoot => cx.tcx.crate_name(def_id.krate).as_str(),
-        data => data.as_symbol().as_str()
+        DefPathData::CrateRoot => cx.tcx.crate_name(def_id.krate),
+        data => data.as_symbol()
     };
 
-    let namespace_name = SmallCStr::new(&namespace_name);
+    let namespace_name = SmallCStr::new(&namespace_name.as_str());
 
     let scope = unsafe {
         llvm::LLVMRustDIBuilderCreateNameSpace(