Pass a `Symbol` to `check_name`, `emit_feature_err`, and related functions.

3 files changed, 5 insertions, 4 deletions

diff --git a/src/librustc_interface/passes.rs b/src/librustc_interface/passes.rs
index 54b3e734205..c5ac8860ccd 100644
--- a/src/librustc_interface/passes.rs
+++ b/src/librustc_interface/passes.rs
@@ -230,7 +230,7 @@ impl BoxedResolver {
 
 pub struct PluginInfo {
     syntax_exts: Vec<NamedSyntaxExtension>,
-    attributes: Vec<(String, AttributeType)>,
+    attributes: Vec<(Symbol, AttributeType)>,
 }
 
 pub fn register_plugins<'a>(
diff --git a/src/librustc_interface/proc_macro_decls.rs b/src/librustc_interface/proc_macro_decls.rs
index 8ed03efd1a7..e9f2f0410d4 100644
--- a/src/librustc_interface/proc_macro_decls.rs
+++ b/src/librustc_interface/proc_macro_decls.rs
@@ -4,6 +4,7 @@ use rustc::hir;
 use rustc::ty::TyCtxt;
 use rustc::ty::query::Providers;
 use syntax::attr;
+use syntax::symbol::sym;
 
 pub fn find<'tcx>(tcx: TyCtxt<'_, 'tcx, 'tcx>) -> Option<DefId> {
     tcx.proc_macro_decls_static(LOCAL_CRATE)
@@ -27,7 +28,7 @@ struct Finder {
 
 impl<'v> ItemLikeVisitor<'v> for Finder {
     fn visit_item(&mut self, item: &hir::Item) {
-        if attr::contains_name(&item.attrs, "rustc_proc_macro_decls") {
+        if attr::contains_name(&item.attrs, sym::rustc_proc_macro_decls) {
             self.decls = Some(item.hir_id);
         }
     }
diff --git a/src/librustc_interface/util.rs b/src/librustc_interface/util.rs
index 17523aedffb..2b1a993d1cc 100644
--- a/src/librustc_interface/util.rs
+++ b/src/librustc_interface/util.rs
@@ -35,7 +35,7 @@ use syntax::mut_visit::{*, MutVisitor, visit_clobber};
 use syntax::ast::BlockCheckMode;
 use syntax::util::lev_distance::find_best_match_for_name;
 use syntax::source_map::{FileLoader, RealFileLoader, SourceMap};
-use syntax::symbol::Symbol;
+use syntax::symbol::{Symbol, sym};
 use syntax::{self, ast, attr};
 #[cfg(not(parallel_compiler))]
 use std::{thread, panic};
@@ -495,7 +495,7 @@ pub fn collect_crate_types(session: &Session, attrs: &[ast::Attribute]) -> Vec<c
     let attr_types: Vec<config::CrateType> = attrs
         .iter()
         .filter_map(|a| {
-            if a.check_name("crate_type") {
+            if a.check_name(sym::crate_type) {
                 match a.value_str() {
                     Some(ref n) if *n == "rlib" => Some(config::CrateType::Rlib),
                     Some(ref n) if *n == "dylib" => Some(config::CrateType::Dylib),