rustdoc: Add attr_pass for extracting attributes

src/rustdoc/attr_pass.rs

@@ -0,0 +1,10 @@
+import rustc::syntax::ast;
+
+export run;
+
+fn run(
+    _doc: doc::cratedoc,
+    _crate: @ast::crate
+) -> doc::cratedoc {
+    fail;
+}

src/rustdoc/rustdoc.rc

@@ -13,4 +13,5 @@ mod attr_parser;
 mod doc;
 mod gen;
 mod fold;
+mod attr_pass;
 mod tystr_pass;