diff --git a/src/libcore/result.rs b/src/libcore/result.rs
index 3957bd31a10..cb34213d974 100644
--- a/src/libcore/result.rs
+++ b/src/libcore/result.rs
@@ -108,7 +108,7 @@ fn chain_err<T: copy, U: copy, V: copy>(
     }
 }
 
-impl methods<T:copy,E:copy> for result<T,E> {
+impl extensions<T:copy, E:copy> for result<T,E> {
     fn chain<U:copy>(op: fn(T) -> result<U,E>) -> result<U,E> {
         chain(self, op)
     }
diff --git a/src/rustc/middle/infer.rs b/src/rustc/middle/infer.rs
index ec7af5ff365..157141235b3 100644
--- a/src/rustc/middle/infer.rs
+++ b/src/rustc/middle/infer.rs
@@ -5,7 +5,7 @@ import middle::ty;
 import syntax::ast;
 import syntax::ast::{ret_style};
 import util::ppaux::{ty_to_str, mt_to_str};
-import result::{result, methods, chain, chain_err, ok, err, map, map2, iter2};
+import result::{result, extensions, ok, err, map, map2, iter2};
 import ty::type_is_bot;
 
 export infer_ctxt;
@@ -85,7 +85,7 @@ fn fixup_vars(cx: infer_ctxt, a: ty::t) -> fres<ty::t> {
 impl methods for ures {
     fn then<T:copy>(f: fn() -> result<T,ty::type_err>)
         -> result<T,ty::type_err> {
-        chain(self) {|_i| f() }
+        self.chain() {|_i| f() }
     }
 }