libsyntax: Introduce an `InternedString` type to reduce `@str` in the

compiler and use it for attributes

1 files changed, 4 insertions, 3 deletions

diff --git a/src/libsyntax/ext/cfg.rs b/src/libsyntax/ext/cfg.rs
index 9af295c0b11..295c456c9d0 100644
--- a/src/libsyntax/ext/cfg.rs
+++ b/src/libsyntax/ext/cfg.rs
@@ -21,9 +21,10 @@ use ext::base;
 use ext::build::AstBuilder;
 use attr;
 use attr::*;
-use parse;
-use parse::token;
 use parse::attr::ParserAttr;
+use parse::token::InternedString;
+use parse::token;
+use parse;
 
 pub fn expand_cfg(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) -> base::MacResult {
     let mut p = parse::new_parser_from_tts(cx.parse_sess(),
@@ -39,7 +40,7 @@ pub fn expand_cfg(cx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) -> base::M
     }
 
     // test_cfg searches for meta items looking like `cfg(foo, ...)`
-    let in_cfg = &[cx.meta_list(sp, @"cfg", cfgs)];
+    let in_cfg = &[cx.meta_list(sp, InternedString::new("cfg"), cfgs)];
 
     let matches_cfg = attr::test_cfg(cx.cfg(), in_cfg.iter().map(|&x| x));
     let e = cx.expr_bool(sp, matches_cfg);