introduce a few copies here and there

src/libstd/rope.rs

@@ -1214,7 +1214,7 @@ mod node {
         }
 
         fn get_next_char_in_leaf(it: t) -> option<char> {
-            alt(it.leaf) {
+            alt copy it.leaf {
               option::none { ret option::none }
               option::some(aleaf) {
                 if it.leaf_byte_pos >= aleaf.byte_len {

src/rustc/middle/trans/base.rs

@@ -345,7 +345,7 @@ fn malloc_boxed_raw(bcx: block, t: ty::t,
 
     // Get the tydesc for the body:
     let lltydesc = get_tydesc(ccx, t, static_ti);
-    lazily_emit_all_tydesc_glue(ccx, static_ti);
+    lazily_emit_all_tydesc_glue(ccx, copy static_ti);
 
     // Allocate space:
     let rval = Call(bcx, ccx.upcalls.malloc, [lltydesc]);

src/rustc/middle/trans/native.rs

@@ -36,7 +36,7 @@ enum x86_64_reg_class {
     memory_class
 }
 
-fn is_sse(c: x86_64_reg_class) -> bool {
+fn is_sse(++c: x86_64_reg_class) -> bool {
     ret alt c {
         sse_fs_class | sse_fv_class |
         sse_ds_class | sse_dv_class { true }