librustc: De-@mut the parse session

src/libsyntax/ext/base.rs

@@ -284,7 +284,7 @@ pub fn syntax_expander_table() -> SyntaxEnv {
 // when a macro expansion occurs, the resulting nodes have the backtrace()
 // -> expn_info of their expansion context stored into their span.
 pub struct ExtCtxt {
-    parse_sess: @mut parse::ParseSess,
+    parse_sess: @parse::ParseSess,
     cfg: ast::CrateConfig,
     backtrace: Option<@ExpnInfo>,
 
@@ -293,7 +293,7 @@ pub struct ExtCtxt {
 }
 
 impl ExtCtxt {
-    pub fn new(parse_sess: @mut parse::ParseSess, cfg: ast::CrateConfig)
+    pub fn new(parse_sess: @parse::ParseSess, cfg: ast::CrateConfig)
                -> ExtCtxt {
         ExtCtxt {
             parse_sess: parse_sess,
@@ -320,7 +320,7 @@ impl ExtCtxt {
     }
 
     pub fn codemap(&self) -> @CodeMap { self.parse_sess.cm }
-    pub fn parse_sess(&self) -> @mut parse::ParseSess { self.parse_sess }
+    pub fn parse_sess(&self) -> @parse::ParseSess { self.parse_sess }
     pub fn cfg(&self) -> ast::CrateConfig { self.cfg.clone() }
     pub fn call_site(&self) -> Span {
         match self.backtrace {

src/libsyntax/ext/expand.rs

@@ -889,7 +889,7 @@ impl ast_fold for Injector {
 
 // add a bunch of macros as though they were placed at the head of the
 // program (ick). This should run before cfg stripping.
-pub fn inject_std_macros(parse_sess: @mut parse::ParseSess,
+pub fn inject_std_macros(parse_sess: @parse::ParseSess,
                          cfg: ast::CrateConfig,
                          c: Crate)
                          -> Crate {
@@ -939,7 +939,7 @@ impl<'a> ast_fold for MacroExpander<'a> {
     }
 }
 
-pub fn expand_crate(parse_sess: @mut parse::ParseSess,
+pub fn expand_crate(parse_sess: @parse::ParseSess,
                     cfg: ast::CrateConfig,
                     c: Crate) -> Crate {
     let mut cx = ExtCtxt::new(parse_sess, cfg.clone());

src/libsyntax/ext/tt/macro_parser.rs

@@ -188,9 +188,9 @@ pub enum named_match {
 
 pub type earley_item = ~MatcherPos;
 
-pub fn nameize(p_s: @mut ParseSess, ms: &[matcher], res: &[@named_match])
+pub fn nameize(p_s: @ParseSess, ms: &[matcher], res: &[@named_match])
             -> HashMap<Ident,@named_match> {
-    fn n_rec(p_s: @mut ParseSess, m: &matcher, res: &[@named_match],
+    fn n_rec(p_s: @ParseSess, m: &matcher, res: &[@named_match],
              ret_val: &mut HashMap<Ident, @named_match>) {
         match *m {
           codemap::Spanned {node: match_tok(_), .. } => (),
@@ -222,7 +222,7 @@ pub enum parse_result {
 }
 
 pub fn parse_or_else(
-    sess: @mut ParseSess,
+    sess: @ParseSess,
     cfg: ast::CrateConfig,
     rdr: @mut reader,
     ms: ~[matcher]
@@ -243,12 +243,11 @@ pub fn token_name_eq(t1 : &Token, t2 : &Token) -> bool {
     }
 }
 
-pub fn parse(
-    sess: @mut ParseSess,
-    cfg: ast::CrateConfig,
-    rdr: @mut reader,
-    ms: &[matcher]
-) -> parse_result {
+pub fn parse(sess: @ParseSess,
+             cfg: ast::CrateConfig,
+             rdr: @mut reader,
+             ms: &[matcher])
+             -> parse_result {
     let mut cur_eis = ~[];
     cur_eis.push(initial_matcher_pos(ms.to_owned(), None, rdr.peek().sp.lo));