rustc: remove some copies

src/librustc/metadata/creader.rs

@@ -65,7 +65,7 @@ struct cache_entry {
     metas: @~[@ast::meta_item]
 }
 
-fn dump_crates(+crate_cache: @mut ~[cache_entry]) {
+fn dump_crates(crate_cache: @mut ~[cache_entry]) {
     debug!("resolved crates:");
     for crate_cache.each |entry| {
         debug!("cnum: %?", entry.cnum);

src/librustc/metadata/loader.rs

@@ -84,11 +84,12 @@ fn libname(cx: Context) -> (~str, ~str) {
     (str::from_slice(dll_prefix), str::from_slice(dll_suffix))
 }
 
-fn find_library_crate_aux(cx: Context,
-                          (prefix, suffix): (~str, ~str),
-                          filesearch: filesearch::FileSearch) ->
-   Option<(~str, @~[u8])> {
-    let crate_name = crate_name_from_metas(/*bad*/copy cx.metas);
+fn find_library_crate_aux(
+    cx: Context,
+    (prefix, suffix): (~str, ~str),
+    filesearch: filesearch::FileSearch
+) -> Option<(~str, @~[u8])> {
+    let crate_name = crate_name_from_metas(cx.metas);
     let prefix: ~str = prefix + *crate_name + ~"-";
     let suffix: ~str = /*bad*/copy suffix;
 
@@ -140,7 +141,7 @@ fn find_library_crate_aux(cx: Context,
     }
 }
 
-pub fn crate_name_from_metas(+metas: &[@ast::meta_item]) -> @~str {
+pub fn crate_name_from_metas(metas: &[@ast::meta_item]) -> @~str {
     let name_items = attr::find_meta_items_by_name(metas, ~"name");
     match vec::last_opt(name_items) {
         Some(i) => {

src/librustc/middle/astencode.rs

@@ -105,7 +105,7 @@ pub fn encode_inlined_item(ecx: @e::EncodeContext,
 pub fn decode_inlined_item(cdata: @cstore::crate_metadata,
                            tcx: ty::ctxt,
                            maps: Maps,
-                           +path: ast_map::path,
+                           path: ast_map::path,
                            par_doc: ebml::Doc)
                         -> Option<ast::inlined_item> {
     let dcx = @DecodeContext {

src/librustc/middle/check_match.rs

@@ -71,7 +71,7 @@ pub fn check_expr(cx: @MatchCheckCtxt, ex: @expr, &&s: (), v: visit::vt<()>) {
                                             arm.pats);
         }
 
-        check_arms(cx, (/*bad*/copy *arms));
+        check_arms(cx, *arms);
         /* Check for exhaustiveness */
          // Check for empty enum, because is_useful only works on inhabited
          // types.
@@ -108,12 +108,12 @@ pub fn check_expr(cx: @MatchCheckCtxt, ex: @expr, &&s: (), v: visit::vt<()>) {
 }
 
 // Check for unreachable patterns
-pub fn check_arms(cx: @MatchCheckCtxt, arms: ~[arm]) {
+pub fn check_arms(cx: @MatchCheckCtxt, arms: &[arm]) {
     let mut seen = ~[];
     for arms.each |arm| {
         for arm.pats.each |pat| {
             let v = ~[*pat];
-            match is_useful(cx, copy seen, v) {
+            match is_useful(cx, &seen, v) {
               not_useful => {
                 cx.tcx.sess.span_err(pat.span, ~"unreachable pattern");
               }