rustc: Remove metadata from the session.

This mechanism was not being used for anything. Issue #487.

src/comp/driver/rustc.rs

@@ -270,9 +270,8 @@ fn build_session(@session::options sopts) -> session::session {
     auto target_cfg = build_target_config();
     auto crate_cache = common::new_int_hash[session::crate_metadata]();
     auto target_crate_num = 0;
-    let vec[@ast::meta_item] md = [];
     auto sess =
-        session::session(target_crate_num, target_cfg, sopts, crate_cache, md,
+        session::session(target_crate_num, target_cfg, sopts, crate_cache,
                          front::codemap::new_codemap());
     ret sess;
 }

src/comp/driver/session.rs

@@ -66,7 +66,6 @@ obj session(ast::crate_num cnum,
             @config targ_cfg,
             @options opts,
             map::hashmap[int, crate_metadata] crates,
-            mutable vec[@ast::meta_item] metadata,
             codemap::codemap cm) {
     fn get_targ_cfg() -> @config { ret targ_cfg; }
     fn get_opts() -> @options { ret opts; }
@@ -81,8 +80,6 @@ obj session(ast::crate_num cnum,
         emit_diagnostic(none[span], msg, "error", 9u8, cm);
         fail;
     }
-    fn add_metadata(vec[@ast::meta_item] data) { metadata = metadata + data; }
-    fn get_metadata() -> vec[@ast::meta_item] { ret metadata; }
     fn span_warn(span sp, str msg) {
         // FIXME: Use constants, but rustboot doesn't know how to export them.
 

src/comp/front/eval.rs

@@ -316,9 +316,7 @@ fn eval_crate_directive(ctx cx, env e, @ast::crate_directive cdir, str prefix,
         case (ast::cdir_view_item(?vi)) {
             vec::push[@ast::view_item](view_items, vi);
         }
-        case (ast::cdir_meta(?vi, ?mi)) {
-            if (vi == ast::export_meta) { cx.sess.add_metadata(mi); }
-        }
+        case (ast::cdir_meta(?vi, ?mi)) { }
         case (ast::cdir_syntax(?pth)) { }
         case (ast::cdir_auth(?pth, ?eff)) { }
     }