diff --git a/src/librustc/middle/astencode.rs b/src/librustc/middle/astencode.rs
index bca1a811a13..c9727db3f5b 100644
--- a/src/librustc/middle/astencode.rs
+++ b/src/librustc/middle/astencode.rs
@@ -383,7 +383,7 @@ impl tr for ast::def {
             ast::def_method(did0.tr(xcx), did1.map(|did1| did1.tr(xcx)))
           }
           ast::def_self_ty(nid) => { ast::def_self_ty(xcx.tr_id(nid)) }
-          ast::def_self(nid, i) => { ast::def_self(xcx.tr_id(nid), i) }
+          ast::def_self(nid) => { ast::def_self(xcx.tr_id(nid)) }
           ast::def_mod(did) => { ast::def_mod(did.tr(xcx)) }
           ast::def_foreign_mod(did) => { ast::def_foreign_mod(did.tr(xcx)) }
           ast::def_static(did, m) => { ast::def_static(did.tr(xcx), m) }
diff --git a/src/librustc/middle/borrowck/check_loans.rs b/src/librustc/middle/borrowck/check_loans.rs
index 70a71f8ad9f..df918caac37 100644
--- a/src/librustc/middle/borrowck/check_loans.rs
+++ b/src/librustc/middle/borrowck/check_loans.rs
@@ -352,7 +352,6 @@ impl<'self> CheckLoanCtxt<'self> {
 
                     mc::cat_rvalue(*) |
                     mc::cat_static_item |
-                    mc::cat_implicit_self |
                     mc::cat_copied_upvar(*) |
                     mc::cat_deref(_, _, mc::unsafe_ptr(*)) |
                     mc::cat_deref(_, _, mc::gc_ptr(*)) |
@@ -435,7 +434,6 @@ impl<'self> CheckLoanCtxt<'self> {
                     mc::cat_self(*) |
                     mc::cat_deref(_, _, mc::unsafe_ptr(*)) |
                     mc::cat_static_item(*) |
-                    mc::cat_implicit_self(*) |
                     mc::cat_deref(_, _, mc::gc_ptr(_)) |
                     mc::cat_deref(_, _, mc::region_ptr(m_const, _)) |
                     mc::cat_deref(_, _, mc::region_ptr(m_imm, _)) => {
diff --git a/src/librustc/middle/borrowck/gather_loans/gather_moves.rs b/src/librustc/middle/borrowck/gather_loans/gather_moves.rs
index 24a6e5b6e0b..d6f9d1db7df 100644
--- a/src/librustc/middle/borrowck/gather_loans/gather_moves.rs
+++ b/src/librustc/middle/borrowck/gather_loans/gather_moves.rs
@@ -100,7 +100,6 @@ fn check_is_legal_to_move_from(bccx: @BorrowckCtxt,
                                cmt0: mc::cmt,
                                cmt: mc::cmt) -> bool {
     match cmt.cat {
-        mc::cat_implicit_self(*) |
         mc::cat_deref(_, _, mc::region_ptr(*)) |
         mc::cat_deref(_, _, mc::gc_ptr(*)) |
         mc::cat_deref(_, _, mc::unsafe_ptr(*)) => {
diff --git a/src/librustc/middle/borrowck/gather_loans/lifetime.rs b/src/librustc/middle/borrowck/gather_loans/lifetime.rs
index b315a7a2e72..1dcfc515139 100644
--- a/src/librustc/middle/borrowck/gather_loans/lifetime.rs
+++ b/src/librustc/middle/borrowck/gather_loans/lifetime.rs
@@ -68,7 +68,6 @@ impl GuaranteeLifetimeContext {
 
         match cmt.cat {
             mc::cat_rvalue(*) |
-            mc::cat_implicit_self |
             mc::cat_copied_upvar(*) |                  // L-Local
             mc::cat_local(*) |                         // L-Local
             mc::cat_arg(*) |                           // L-Local
@@ -301,7 +300,6 @@ impl GuaranteeLifetimeContext {
             }
             mc::cat_rvalue(*) |
             mc::cat_static_item |
-            mc::cat_implicit_self |
             mc::cat_copied_upvar(*) |
             mc::cat_deref(*) => {
                 false
@@ -328,7 +326,6 @@ impl GuaranteeLifetimeContext {
             mc::cat_rvalue(cleanup_scope_id) => {
                 ty::re_scope(cleanup_scope_id)
             }
-            mc::cat_implicit_self |
             mc::cat_copied_upvar(_) => {
                 ty::re_scope(self.item_scope_id)
             }
diff --git a/src/librustc/middle/borrowck/gather_loans/restrictions.rs b/src/librustc/middle/borrowck/gather_loans/restrictions.rs
index 3b518cb1590..ccfef63d9bc 100644
--- a/src/librustc/middle/borrowck/gather_loans/restrictions.rs
+++ b/src/librustc/middle/borrowck/gather_loans/restrictions.rs
@@ -115,7 +115,6 @@ impl RestrictionsContext {
 
             mc::cat_copied_upvar(*) | // FIXME(#2152) allow mutation of upvars
             mc::cat_static_item(*) |
-            mc::cat_implicit_self(*) |
             mc::cat_deref(_, _, mc::region_ptr(m_imm, _)) |
             mc::cat_deref(_, _, mc::gc_ptr(m_imm)) => {
                 // R-Deref-Imm-Borrowed
diff --git a/src/librustc/middle/borrowck/mod.rs b/src/librustc/middle/borrowck/mod.rs
index a84716bd73f..4490fe65d91 100644
--- a/src/librustc/middle/borrowck/mod.rs
+++ b/src/librustc/middle/borrowck/mod.rs
@@ -284,8 +284,7 @@ pub fn opt_loan_path(cmt: mc::cmt) -> Option<@LoanPath> {
     match cmt.cat {
         mc::cat_rvalue(*) |
         mc::cat_static_item |
-        mc::cat_copied_upvar(_) |
-        mc::cat_implicit_self => {
+        mc::cat_copied_upvar(_) => {
             None
         }
 
diff --git a/src/librustc/middle/mem_categorization.rs b/src/librustc/middle/mem_categorization.rs
index c38677adfbf..8be9a5db8bb 100644
--- a/src/librustc/middle/mem_categorization.rs
+++ b/src/librustc/middle/mem_categorization.rs
@@ -61,7 +61,6 @@ use syntax::print::pprust;
 pub enum categorization {
     cat_rvalue(ast::NodeId),           // temporary val, argument is its scope
     cat_static_item,
-    cat_implicit_self,
     cat_copied_upvar(CopiedUpvar),     // upvar copied into @fn or ~fn env
     cat_stack_upvar(cmt),              // by ref upvar from &fn
     cat_local(ast::NodeId),            // local variable
@@ -493,17 +492,11 @@ impl mem_categorization_ctxt {
             }
           }
 
-          ast::def_self(self_id, is_implicit) => {
-            let cat = if is_implicit {
-                cat_implicit_self
-            } else {
-                cat_self(self_id)
-            };
-
+          ast::def_self(self_id) => {
             @cmt_ {
                 id:id,
                 span:span,
-                cat:cat,
+                cat:cat_self(self_id),
                 mutbl: McImmutable,
                 ty:expr_ty
             }
@@ -1016,9 +1009,6 @@ impl mem_categorization_ctxt {
           cat_static_item => {
               ~"static item"
           }
-          cat_implicit_self => {
-              ~"self reference"
-          }
           cat_copied_upvar(_) => {
               ~"captured outer variable in a heap closure"
           }
@@ -1121,7 +1111,6 @@ impl cmt_ {
         match self.cat {
             cat_rvalue(*) |
             cat_static_item |
-            cat_implicit_self |
             cat_copied_upvar(*) |
             cat_local(*) |
             cat_self(*) |
@@ -1167,8 +1156,7 @@ impl cmt_ {
             }
 
             cat_copied_upvar(CopiedUpvar {onceness: ast::Many, _}) |
-            cat_static_item(*) |
-            cat_implicit_self(*) => {
+            cat_static_item(*) => {
                 Some(AliasableOther)
             }
 
@@ -1206,7 +1194,6 @@ impl Repr for categorization {
     fn repr(&self, tcx: ty::ctxt) -> ~str {
         match *self {
             cat_static_item |
-            cat_implicit_self |
             cat_rvalue(*) |
             cat_copied_upvar(*) |
             cat_local(*) |
diff --git a/src/librustc/middle/moves.rs b/src/librustc/middle/moves.rs
index 0c553843cd1..ebd9b2b2223 100644
--- a/src/librustc/middle/moves.rs
+++ b/src/librustc/middle/moves.rs
@@ -218,7 +218,7 @@ pub fn moved_variable_node_id_from_def(def: def) -> Option<NodeId> {
       def_binding(nid, _) |
       def_arg(nid, _) |
       def_local(nid, _) |
-      def_self(nid, _) => Some(nid),
+      def_self(nid) => Some(nid),
 
       _ => None
     }
diff --git a/src/librustc/middle/resolve.rs b/src/librustc/middle/resolve.rs
index 9654bf3fc01..351f4f8277a 100644
--- a/src/librustc/middle/resolve.rs
+++ b/src/librustc/middle/resolve.rs
@@ -125,7 +125,7 @@ pub enum Mutability {
 
 pub enum SelfBinding {
     NoSelfBinding,
-    HasSelfBinding(NodeId, bool /* is implicit */)
+    HasSelfBinding(NodeId)
 }
 
 struct ResolveVisitor {
@@ -3769,9 +3769,8 @@ impl Resolver {
                 NoSelfBinding => {
                     // Nothing to do.
                 }
-                HasSelfBinding(self_node_id, is_implicit) => {
-                    let def_like = dl_def(def_self(self_node_id,
-                                                   is_implicit));
+                HasSelfBinding(self_node_id) => {
+                    let def_like = dl_def(def_self(self_node_id));
                     *function_value_rib.self_binding = Some(def_like);
                 }
             }
@@ -3915,7 +3914,7 @@ impl Resolver {
         // we only have self ty if it is a non static method
         let self_binding = match method.explicit_self.node {
           sty_static => { NoSelfBinding }
-          _ => { HasSelfBinding(method.self_id, false) }
+          _ => { HasSelfBinding(method.self_id) }
         };
 
         self.resolve_function(rib_kind,
diff --git a/src/librustc/middle/trans/expr.rs b/src/librustc/middle/trans/expr.rs
index 2ce8756848f..4b31b912353 100644
--- a/src/librustc/middle/trans/expr.rs
+++ b/src/librustc/middle/trans/expr.rs
@@ -1088,7 +1088,7 @@ pub fn trans_local_var(bcx: @mut Block, def: ast::def) -> Datum {
         ast::def_local(nid, _) | ast::def_binding(nid, _) => {
             take_local(bcx, bcx.fcx.lllocals, nid)
         }
-        ast::def_self(nid, _) => {
+        ast::def_self(nid) => {
             let self_info: ValSelfData = match bcx.fcx.llself {
                 Some(ref self_info) => *self_info,
                 None => {
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index ad6bf69d55a..8f7d8ac186e 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -3094,7 +3094,7 @@ pub fn ty_param_bounds_and_ty_for_def(fcx: @mut FnCtxt,
                                    -> ty_param_bounds_and_ty {
 
     match defn {
-      ast::def_arg(nid, _) | ast::def_local(nid, _) | ast::def_self(nid, _) |
+      ast::def_arg(nid, _) | ast::def_local(nid, _) | ast::def_self(nid) |
       ast::def_binding(nid, _) => {
           let typ = fcx.local_ty(sp, nid);
           return no_params(typ);
diff --git a/src/librustc/middle/typeck/check/regionck.rs b/src/librustc/middle/typeck/check/regionck.rs
index 05f1323805b..b25d81056b0 100644
--- a/src/librustc/middle/typeck/check/regionck.rs
+++ b/src/librustc/middle/typeck/check/regionck.rs
@@ -58,7 +58,7 @@ fn encl_region_of_def(fcx: @mut FnCtxt, def: ast::def) -> ty::Region {
     let tcx = fcx.tcx();
     match def {
         def_local(node_id, _) | def_arg(node_id, _) |
-        def_self(node_id, _) | def_binding(node_id, _) => {
+        def_self(node_id) | def_binding(node_id, _) => {
             tcx.region_maps.encl_region(node_id)
         }
         def_upvar(_, subdef, closure_id, body_id) => {
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index b01c19a59c1..f09c7427ecc 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -171,7 +171,7 @@ pub enum def {
     def_static_method(/* method */ def_id,
                       /* trait */  Option<def_id>,
                       purity),
-    def_self(NodeId, bool /* is_implicit */),
+    def_self(NodeId),
     def_self_ty(/* trait id */ NodeId),
     def_mod(def_id),
     def_foreign_mod(def_id),
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index cfbe61ca65e..a39da4301ba 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -64,7 +64,7 @@ pub fn def_id_of_def(d: def) -> def_id {
       def_use(id) | def_struct(id) | def_trait(id) | def_method(id, _) => {
         id
       }
-      def_arg(id, _) | def_local(id, _) | def_self(id, _) | def_self_ty(id)
+      def_arg(id, _) | def_local(id, _) | def_self(id) | def_self_ty(id)
       | def_upvar(id, _, _, _) | def_binding(id, _) | def_region(id)
       | def_typaram_binder(id) | def_label(id) => {
         local_def(id)