diff --git a/src/librustc/metadata/encoder.rs b/src/librustc/metadata/encoder.rs
index 193b53bcfc2d..2dccf77da8ed 100644
--- a/src/librustc/metadata/encoder.rs
+++ b/src/librustc/metadata/encoder.rs
@@ -61,7 +61,6 @@ pub struct EncodeParams<'a> {
     tcx: ty::ctxt,
     reexports2: middle::resolve::ExportMap2,
     item_symbols: &'a RefCell<HashMap<ast::NodeId, ~str>>,
-    discrim_symbols: &'a HashMap<ast::NodeId, @str>,
     non_inlineable_statics: &'a HashSet<ast::NodeId>,
     link_meta: &'a LinkMeta,
     cstore: @mut cstore::CStore,
@@ -91,7 +90,6 @@ pub struct EncodeContext<'a> {
     stats: @mut Stats,
     reexports2: middle::resolve::ExportMap2,
     item_symbols: &'a RefCell<HashMap<ast::NodeId, ~str>>,
-    discrim_symbols: &'a HashMap<ast::NodeId, @str>,
     non_inlineable_statics: &'a HashSet<ast::NodeId>,
     link_meta: &'a LinkMeta,
     cstore: &'a cstore::CStore,
@@ -1745,7 +1743,6 @@ pub fn encode_metadata(parms: EncodeParams, crate: &Crate) -> ~[u8] {
         diag,
         tcx,
         reexports2,
-        discrim_symbols,
         cstore,
         encode_inlined_item,
         link_meta,
@@ -1761,7 +1758,6 @@ pub fn encode_metadata(parms: EncodeParams, crate: &Crate) -> ~[u8] {
         stats: stats,
         reexports2: reexports2,
         item_symbols: item_symbols,
-        discrim_symbols: discrim_symbols,
         non_inlineable_statics: non_inlineable_statics,
         link_meta: link_meta,
         cstore: cstore,
diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index f9293063a412..60afadcb68a4 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -3056,14 +3056,12 @@ pub fn crate_ctxt_to_encode_parms<'r>(cx: &'r CrateContext, ie: encoder::encode_
 
         let diag = cx.sess.diagnostic();
         let item_symbols = &cx.item_symbols;
-        let discrim_symbols = &cx.discrim_symbols;
         let link_meta = &cx.link_meta;
         encoder::EncodeParams {
             diag: diag,
             tcx: cx.tcx,
             reexports2: cx.exp_map2,
             item_symbols: item_symbols,
-            discrim_symbols: discrim_symbols,
             non_inlineable_statics: &cx.non_inlineable_statics,
             link_meta: link_meta,
             cstore: cx.sess.cstore,
diff --git a/src/librustc/middle/trans/context.rs b/src/librustc/middle/trans/context.rs
index 44288cd3b64f..3c3e92d00adc 100644
--- a/src/librustc/middle/trans/context.rs
+++ b/src/librustc/middle/trans/context.rs
@@ -52,8 +52,6 @@ pub struct CrateContext {
      reachable: @mut HashSet<ast::NodeId>,
      item_symbols: RefCell<HashMap<ast::NodeId, ~str>>,
      link_meta: LinkMeta,
-     discrims: HashMap<ast::DefId, ValueRef>,
-     discrim_symbols: HashMap<ast::NodeId, @str>,
      tydescs: HashMap<ty::t, @mut tydesc_info>,
      // Set when running emit_tydescs to enforce that no more tydescs are
      // created.
@@ -191,8 +189,6 @@ impl CrateContext {
                   reachable: reachable,
                   item_symbols: RefCell::new(HashMap::new()),
                   link_meta: link_meta,
-                  discrims: HashMap::new(),
-                  discrim_symbols: HashMap::new(),
                   tydescs: HashMap::new(),
                   finished_tydescs: false,
                   external: HashMap::new(),