fix tests, remove some warnings

src/libsyntax/ext/asm.rs

@@ -21,7 +21,6 @@ use ext::base::*;
 use parse;
 use parse::token;
 
-use core::str;
 use core::vec;
 
 enum State {

src/libsyntax/ext/pipes/liveness.rs

@@ -42,7 +42,6 @@ use core::prelude::*;
 use ext::base::ExtCtxt;
 use ext::pipes::proto::{protocol_};
 
-use core::str;
 use extra::bitv::Bitv;
 
 pub fn analyze(proto: @mut protocol_, _cx: @ExtCtxt) {

src/libsyntax/ext/tt/macro_parser.rs

@@ -24,7 +24,6 @@ use parse::token;
 
 use core::iterator::IteratorUtil;
 use core::hashmap::HashMap;
-use core::str;
 use core::uint;
 use core::vec;
 
@@ -371,14 +370,14 @@ pub fn parse(
         } else {
             if (bb_eis.len() > 0u && next_eis.len() > 0u)
                 || bb_eis.len() > 1u {
-                let nts = vec::map(bb_eis.connect(|ei| {
+                let nts = bb_eis.map(|ei| {
                     match ei.elts[ei.idx].node {
                       match_nonterminal(ref bind,ref name,_) => {
                         fmt!("%s ('%s')", *ident_to_str(name),
                              *ident_to_str(bind))
                       }
                       _ => fail!()
-                    } }), " or ");
+                    } }).connect(" or ");
                 return error(sp, fmt!(
                     "Local ambiguity: multiple parsing options: \
                      built-in NTs %s or %u other options.",