diff --git a/src/librustc/middle/expr_use_visitor.rs b/src/librustc/middle/expr_use_visitor.rs
index 5cc7502b5128..bab954c29596 100644
--- a/src/librustc/middle/expr_use_visitor.rs
+++ b/src/librustc/middle/expr_use_visitor.rs
@@ -29,7 +29,6 @@ use middle::ty::{MethodOrigin, MethodParam, MethodTypeParam};
 use middle::ty::{MethodStatic, MethodStaticClosure};
 use util::ppaux::Repr;
 
-use std::marker;
 use syntax::{ast, ast_util};
 use syntax::ptr::P;
 use syntax::codemap::Span;
@@ -128,16 +127,14 @@ pub enum MatchMode {
     MovingMatch,
 }
 
-#[derive(PartialEq,Debug)]
-enum TrackMatchMode<T> {
+#[derive(Copy, PartialEq, Debug)]
+enum TrackMatchMode {
     Unknown,
     Definite(MatchMode),
     Conflicting,
 }
 
-impl<T> marker::Copy for TrackMatchMode<T> {}
-
-impl<T> TrackMatchMode<T> {
+impl TrackMatchMode {
     // Builds up the whole match mode for a pattern from its constituent
     // parts.  The lattice looks like this:
     //
@@ -931,7 +928,7 @@ impl<'d,'t,'tcx,TYPER:mc::Typer<'tcx>> ExprUseVisitor<'d,'t,'tcx,TYPER> {
         return true;
     }
 
-    fn arm_move_mode(&mut self, discr_cmt: mc::cmt<'tcx>, arm: &ast::Arm) -> TrackMatchMode<Span> {
+    fn arm_move_mode(&mut self, discr_cmt: mc::cmt<'tcx>, arm: &ast::Arm) -> TrackMatchMode {
         let mut mode = Unknown;
         for pat in &arm.pats {
             self.determine_pat_move_mode(discr_cmt.clone(), &**pat, &mut mode);
@@ -966,7 +963,7 @@ impl<'d,'t,'tcx,TYPER:mc::Typer<'tcx>> ExprUseVisitor<'d,'t,'tcx,TYPER> {
     fn determine_pat_move_mode(&mut self,
                                cmt_discr: mc::cmt<'tcx>,
                                pat: &ast::Pat,
-                               mode: &mut TrackMatchMode<Span>) {
+                               mode: &mut TrackMatchMode) {
         debug!("determine_pat_move_mode cmt_discr={} pat={}", cmt_discr.repr(self.tcx()),
                pat.repr(self.tcx()));
         return_if_err!(self.mc.cat_pattern(cmt_discr, pat, |_mc, cmt_pat, pat| {
diff --git a/src/librustc/middle/infer/higher_ranked/mod.rs b/src/librustc/middle/infer/higher_ranked/mod.rs
index 4469e27a5b05..a729156c88b3 100644
--- a/src/librustc/middle/infer/higher_ranked/mod.rs
+++ b/src/librustc/middle/infer/higher_ranked/mod.rs
@@ -31,7 +31,7 @@ pub trait HigherRankedRelations<'tcx> {
         where T : Combineable<'tcx>;
 }
 
-trait InferCtxtExt<'tcx> {
+trait InferCtxtExt {
     fn tainted_regions(&self, snapshot: &CombinedSnapshot, r: ty::Region) -> Vec<ty::Region>;
 
     fn region_vars_confined_to_snapshot(&self,
@@ -371,7 +371,7 @@ fn fold_regions_in<'tcx, T, F>(tcx: &ty::ctxt<'tcx>,
     }))
 }
 
-impl<'a,'tcx> InferCtxtExt<'tcx> for InferCtxt<'a,'tcx> {
+impl<'a,'tcx> InferCtxtExt for InferCtxt<'a,'tcx> {
     fn tainted_regions(&self, snapshot: &CombinedSnapshot, r: ty::Region) -> Vec<ty::Region> {
         self.region_vars.tainted(&snapshot.region_vars_snapshot, r)
     }
diff --git a/src/librustc_typeck/check/method/suggest.rs b/src/librustc_typeck/check/method/suggest.rs
index 063300a1d728..796da951439b 100644
--- a/src/librustc_typeck/check/method/suggest.rs
+++ b/src/librustc_typeck/check/method/suggest.rs
@@ -306,10 +306,10 @@ pub fn all_traits<'a>(ccx: &'a CrateCtxt) -> AllTraits<'a> {
         // Crate-local:
         //
         // meh.
-        struct Visitor<'a, 'b: 'a, 'tcx: 'a + 'b> {
+        struct Visitor<'a> {
             traits: &'a mut AllTraitsVec,
         }
-        impl<'v,'a, 'b, 'tcx> visit::Visitor<'v> for Visitor<'a, 'b, 'tcx> {
+        impl<'v, 'a> visit::Visitor<'v> for Visitor<'a> {
             fn visit_item(&mut self, i: &'v ast::Item) {
                 match i.node {
                     ast::ItemTrait(..) => {
diff --git a/src/libstd/old_io/mod.rs b/src/libstd/old_io/mod.rs
index 4bd0662232fe..9655da92e569 100644
--- a/src/libstd/old_io/mod.rs
+++ b/src/libstd/old_io/mod.rs
@@ -433,7 +433,7 @@ pub enum IoErrorKind {
 }
 
 /// A trait that lets you add a `detail` to an IoError easily
-trait UpdateIoError<T> {
+trait UpdateIoError {
     /// Returns an IoError with updated description and detail
     fn update_err<D>(self, desc: &'static str, detail: D) -> Self where
         D: FnOnce(&IoError) -> String;
@@ -446,7 +446,7 @@ trait UpdateIoError<T> {
     fn update_desc(self, desc: &'static str) -> Self;
 }
 
-impl<T> UpdateIoError<T> for IoResult<T> {
+impl<T> UpdateIoError for IoResult<T> {
     fn update_err<D>(self, desc: &'static str, detail: D) -> IoResult<T> where
         D: FnOnce(&IoError) -> String,
     {
diff --git a/src/libsyntax/std_inject.rs b/src/libsyntax/std_inject.rs
index 98c193c7e6b8..fcb1cdf216b4 100644
--- a/src/libsyntax/std_inject.rs
+++ b/src/libsyntax/std_inject.rs
@@ -45,11 +45,11 @@ fn no_prelude(attrs: &[ast::Attribute]) -> bool {
     attr::contains_name(attrs, "no_implicit_prelude")
 }
 
-struct StandardLibraryInjector<'a> {
-    alt_std_name: Option<String>
+struct StandardLibraryInjector {
+    alt_std_name: Option<String>,
 }
 
-impl<'a> fold::Folder for StandardLibraryInjector<'a> {
+impl fold::Folder for StandardLibraryInjector {
     fn fold_crate(&mut self, mut krate: ast::Crate) -> ast::Crate {
 
         // The name to use in `extern crate "name" as std;`
@@ -80,9 +80,10 @@ fn inject_crates_ref(krate: ast::Crate, alt_std_name: Option<String>) -> ast::Cr
     fold.fold_crate(krate)
 }
 
-struct PreludeInjector<'a>;
+struct PreludeInjector;
 
-impl<'a> fold::Folder for PreludeInjector<'a> {
+
+impl fold::Folder for PreludeInjector {
     fn fold_crate(&mut self, mut krate: ast::Crate) -> ast::Crate {
         // only add `use std::prelude::*;` if there wasn't a
         // `#![no_implicit_prelude]` at the crate level.