Allow `IdentMacroExpander::expand` to access the ident macro invocation's attributes.

src/libsyntax/ext/base.rs

@@ -177,7 +177,8 @@ fn expand<'cx>(&self,
                    cx: &'cx mut ExtCtxt,
                    sp: Span,
                    ident: ast::Ident,
-                   token_tree: Vec<tokenstream::TokenTree> )
+                   token_tree: Vec<tokenstream::TokenTree>,
+                   attrs: Vec<ast::Attribute>)
                    -> Box<MacResult+'cx>;
 }
 
@@ -193,7 +194,8 @@ fn expand<'cx>(&self,
                    cx: &'cx mut ExtCtxt,
                    sp: Span,
                    ident: ast::Ident,
-                   token_tree: Vec<tokenstream::TokenTree> )
+                   token_tree: Vec<tokenstream::TokenTree>,
+                   _attrs: Vec<ast::Attribute>)
                    -> Box<MacResult+'cx>
     {
         (*self)(cx, sp, ident, token_tree)

src/libsyntax/ext/expand.rs

@@ -374,7 +374,7 @@ fn expand_bang_invoc(&mut self, invoc: Invocation, ext: Rc<SyntaxExtension>) ->
                     }
                 });
 
-                kind.make_from(expander.expand(self.cx, span, ident, marked_tts))
+                kind.make_from(expander.expand(self.cx, span, ident, marked_tts, attrs))
             }
 
             MacroRulesTT => {