Use quasiquotes for attributes in `plugins` crate.

Fixes #5157.

components/plugins/jstraceable.rs

@@ -7,27 +7,20 @@ use syntax::codemap::Span;
 use syntax::ptr::P;
 use syntax::ast::{Item, MetaItem, Expr};
 use syntax::ast;
-use syntax::attr;
 use syntax::ext::build::AstBuilder;
 use syntax::ext::deriving::generic::{combine_substructure, EnumMatching, FieldInfo, MethodDef, Struct, Substructure, TraitDef, ty};
-use syntax::parse::token::InternedString;
 
-pub fn expand_dom_struct(_: &mut ExtCtxt, _: Span, _: &MetaItem, item: P<Item>) -> P<Item> {
+pub fn expand_dom_struct(cx: &mut ExtCtxt, _: Span, _: &MetaItem, item: P<Item>) -> P<Item> {
     let mut item2 = (*item).clone();
-    {
-        let mut add_attr = |s| {
-            item2.attrs.push(attr::mk_attr_outer(attr::mk_attr_id(), attr::mk_word_item(InternedString::new(s))));
-        };
-        add_attr("must_root");
-        add_attr("privatize");
-        add_attr("jstraceable");
+    item2.attrs.push(quote_attr!(cx, #[must_root]));
+    item2.attrs.push(quote_attr!(cx, #[privatize]));
+    item2.attrs.push(quote_attr!(cx, #[jstraceable]));
 
-        // The following attributes are only for internal usage
-        add_attr("_generate_reflector");
-        // #[dom_struct] gets consumed, so this lets us keep around a residue
-        // Do NOT register a modifier/decorator on this attribute
-        add_attr("_dom_struct_marker");
-    }
+    // The following attributes are only for internal usage
+    item2.attrs.push(quote_attr!(cx, #[_generate_reflector]));
+    // #[dom_struct] gets consumed, so this lets us keep around a residue
+    // Do NOT register a modifier/decorator on this attribute
+    item2.attrs.push(quote_attr!(cx, #[_dom_struct_marker]));
     P(item2)
 }
 
@@ -48,9 +41,7 @@ pub fn expand_jstraceable(cx: &mut ExtCtxt, span: Span, mitem: &MetaItem, item:
                 explicit_self: ty::borrowed_explicit_self(),
                 args: vec!(ty::Ptr(box ty::Literal(ty::Path::new(vec!("js","jsapi","JSTracer"))), ty::Raw(ast::MutMutable))),
                 ret_ty: ty::nil_ty(),
-                attributes: vec!(attr::mk_attr_outer(attr::mk_attr_id(),
-                                                     attr::mk_name_value_item_str(InternedString::new("inline"),
-                                                                                  InternedString::new("always")))),
+                attributes: vec![quote_attr!(cx, #[inline(always)])],
                 combine_substructure: combine_substructure(box jstraceable_substructure)
             }
         ],