De-mode vec::each() and many of the str iteration routines

Note that the method foo.each() is not de-moded, nor the other
vec routines.

src/libsyntax/ext/qquote.rs

@@ -228,7 +228,7 @@ fn finish<T: qq_helper>
     let mut state = active;
     let mut i = 0u, j = 0u;
     let g_len = cx.gather.len();
-    do str::chars_iter(*str) |ch| {
+    for str::chars_each(*str) |ch| {
         if (j < g_len && i == cx.gather[j].lo) {
             assert ch == '$';
             let repl = fmt!("$%u ", j);

src/libsyntax/ext/simplext.rs

@@ -211,7 +211,7 @@ pure fn follow(m: arb_depth<matchable>, idx_path: &[uint]) ->
     for vec::each(idx_path) |idx| {
         res = match res {
           leaf(_) => return res,/* end of the line */
-          seq(new_ms, _) => new_ms[idx]
+          seq(new_ms, _) => new_ms[*idx]
         }
     }
     return res;