librustc: De-@mut several instances of io::Writer.

There are a few more related to pretty printing.

src/librustc/driver/driver.rs

@@ -569,13 +569,14 @@ pub fn pretty_print_input(sess: Session,
 
     let src = sess.codemap.get_filemap(source_name(input)).src;
     let rdr = @mut MemReader::new(src.as_bytes().to_owned());
+    let stdout = io::stdout();
     pprust::print_crate(sess.codemap,
                         token::get_ident_interner(),
                         sess.span_diagnostic,
                         &crate,
                         source_name(input),
                         rdr as @mut io::Reader,
-                        @mut io::stdout() as @mut io::Writer,
+                        @mut stdout as @mut io::Writer,
                         annotation,
                         is_expanded);
 }
@@ -1080,7 +1081,7 @@ pub fn early_error(emitter: @diagnostic::Emitter, msg: &str) -> ! {
     fail!();
 }
 
-pub fn list_metadata(sess: Session, path: &Path, out: @mut io::Writer) {
+pub fn list_metadata(sess: Session, path: &Path, out: &mut io::Writer) {
     metadata::loader::list_file_metadata(
         token::get_ident_interner(),
         session::sess_os_to_meta_os(sess.targ_cfg.os), path, out);

src/librustc/lib.rs

@@ -275,8 +275,9 @@ pub fn run_compiler(args: &[~str], demitter: @diagnostic::Emitter) {
     if ls {
         match input {
           d::file_input(ref ifile) => {
+            let mut stdout = io::stdout();
             d::list_metadata(sess, &(*ifile),
-                                  @mut io::stdout() as @mut io::Writer);
+                                  &mut stdout as &mut io::Writer);
           }
           d::str_input(_) => {
             d::early_error(demitter, "can not list metadata for stdin");

src/librustc/metadata/decoder.rs

@@ -1110,7 +1110,7 @@ fn get_attributes(md: ebml::Doc) -> ~[ast::Attribute] {
 }
 
 fn list_crate_attributes(intr: @ident_interner, md: ebml::Doc, hash: &str,
-                         out: @mut io::Writer) {
+                         out: &mut io::Writer) {
     write!(out, "=Crate Attributes ({})=\n", hash);
 
     let r = get_attributes(md);
@@ -1153,7 +1153,7 @@ pub fn get_crate_deps(data: &[u8]) -> ~[CrateDep] {
     return deps;
 }
 
-fn list_crate_deps(data: &[u8], out: @mut io::Writer) {
+fn list_crate_deps(data: &[u8], out: &mut io::Writer) {
     write!(out, "=External Dependencies=\n");
 
     let r = get_crate_deps(data);
@@ -1180,7 +1180,7 @@ pub fn get_crate_vers(data: &[u8]) -> @str {
 }
 
 pub fn list_crate_metadata(intr: @ident_interner, bytes: &[u8],
-                           out: @mut io::Writer) {
+                           out: &mut io::Writer) {
     let hash = get_crate_hash(bytes);
     let md = reader::Doc(bytes);
     list_crate_attributes(intr, md, hash, out);

src/librustc/metadata/loader.rs

@@ -380,7 +380,7 @@ pub fn read_meta_section_name(os: Os) -> &'static str {
 pub fn list_file_metadata(intr: @ident_interner,
                           os: Os,
                           path: &Path,
-                          out: @mut io::Writer) {
+                          out: &mut io::Writer) {
     match get_metadata_section(os, path) {
       option::Some(bytes) => decoder::list_crate_metadata(intr,
                                                           bytes.as_slice(),