diff --git a/src/libextra/bitv.rs b/src/libextra/bitv.rs
index 834faf96eb687..96055c70f9688 100644
--- a/src/libextra/bitv.rs
+++ b/src/libextra/bitv.rs
@@ -1635,9 +1635,9 @@ mod tests {
     fn bench_btv_small_iter(b: &mut BenchHarness) {
         let bitv = Bitv::new(uint::bits, false);
         do b.iter {
-            let mut sum = 0;
+            let mut _sum = 0;
             foreach pres in bitv.iter() {
-                sum += pres as uint;
+                _sum += pres as uint;
             }
         }
     }
@@ -1646,9 +1646,9 @@ mod tests {
     fn bench_bitv_big_iter(b: &mut BenchHarness) {
         let bitv = Bitv::new(BENCH_BITS, false);
         do b.iter {
-            let mut sum = 0;
+            let mut _sum = 0;
             foreach pres in bitv.iter() {
-                sum += pres as uint;
+                _sum += pres as uint;
             }
         }
     }
@@ -1658,9 +1658,9 @@ mod tests {
         let bitv = BitvSet::from_bitv(from_fn(BENCH_BITS,
                                               |idx| {idx % 3 == 0}));
         do b.iter {
-            let mut sum = 0;
+            let mut _sum = 0;
             foreach idx in bitv.iter() {
-                sum += idx;
+                _sum += idx;
             }
         }
     }
diff --git a/src/libextra/flatpipes.rs b/src/libextra/flatpipes.rs
index 9e7294df4b7eb..b43962dae40fe 100644
--- a/src/libextra/flatpipes.rs
+++ b/src/libextra/flatpipes.rs
@@ -633,16 +633,12 @@ pub mod bytepipes {
 #[cfg(test)]
 mod test {
 
-    use flatpipes::{Flattener, Unflattener};
-    use flatpipes::bytepipes::*;
+    use flatpipes::BytePort;
     use flatpipes::pod;
     use flatpipes::serial;
     use io_util::BufReader;
-    use flatpipes::{BytePort, FlatChan, FlatPort};
 
-    use std::comm;
     use std::io::BytesWriter;
-    use std::result;
     use std::task;
 
     #[test]
@@ -727,7 +723,11 @@ mod test {
 
     // FIXME #2064: Networking doesn't work on x86
     // XXX Broken until networking support is added back
-    /*#[test]
+    /*
+    use flatpipes::{Flattener, Unflattener, FlatChan, FlatPort};
+    use flatpipes::bytepipes::*;
+
+    #[test]
     #[cfg(target_arch = "x86_64")]
     fn test_pod_tcp_stream() {
         fn reader_port(buf: TcpSocketBuf
@@ -767,6 +767,8 @@ mod test {
         port: uint) {
 
         use std::cell::Cell;
+        use std::comm;
+        use std::result;
         use net::ip;
         use net::tcp;
         use uv;
diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index a8d1a1d49d75e..3240b297abcce 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -2746,13 +2746,8 @@ pub fn check_expr_with_unifier(fcx: @mut FnCtxt,
       }
       ast::expr_vec(ref args, mutbl) => {
         let t: ty::t = fcx.infcx().next_ty_var();
-        let mut arg_is_bot = false;
-        let mut arg_is_err = false;
         foreach e in args.iter() {
             check_expr_has_type(fcx, *e, t);
-            let arg_t = fcx.expr_ty(*e);
-            arg_is_bot |= ty::type_is_bot(arg_t);
-            arg_is_err |= ty::type_is_error(arg_t);
         }
         let typ = ty::mk_evec(tcx, ty::mt {ty: t, mutbl: mutbl},
                               ty::vstore_fixed(args.len()));