Deny bare trait objects in in src/libsyntax

src/libsyntax/print/pprust.rs

@@ -62,10 +62,10 @@ pub struct State<'a> {
     literals: Peekable<vec::IntoIter<comments::Literal>>,
     cur_cmnt: usize,
     boxes: Vec<pp::Breaks>,
-    ann: &'a (PpAnn+'a),
+    ann: &'a (dyn PpAnn+'a),
 }
 
-fn rust_printer<'a>(writer: Box<Write+'a>, ann: &'a PpAnn) -> State<'a> {
+fn rust_printer<'a>(writer: Box<dyn Write+'a>, ann: &'a dyn PpAnn) -> State<'a> {
     State {
         s: pp::mk_printer(writer, DEFAULT_COLUMNS),
         cm: None,
@@ -88,9 +88,9 @@ pub fn print_crate<'a>(cm: &'a CodeMap,
                        sess: &ParseSess,
                        krate: &ast::Crate,
                        filename: FileName,
-                       input: &mut Read,
-                       out: Box<Write+'a>,
-                       ann: &'a PpAnn,
+                       input: &mut dyn Read,
+                       out: Box<dyn Write+'a>,
+                       ann: &'a dyn PpAnn,
                        is_expanded: bool) -> io::Result<()> {
     let mut s = State::new_from_input(cm, sess, filename, input, out, ann, is_expanded);
 
@@ -121,9 +121,9 @@ impl<'a> State<'a> {
     pub fn new_from_input(cm: &'a CodeMap,
                           sess: &ParseSess,
                           filename: FileName,
-                          input: &mut Read,
-                          out: Box<Write+'a>,
-                          ann: &'a PpAnn,
+                          input: &mut dyn Read,
+                          out: Box<dyn Write+'a>,
+                          ann: &'a dyn PpAnn,
                           is_expanded: bool) -> State<'a> {
         let (cmnts, lits) = comments::gather_comments_and_literals(sess, filename, input);
 
@@ -139,8 +139,8 @@ impl<'a> State<'a> {
     }
 
     pub fn new(cm: &'a CodeMap,
-               out: Box<Write+'a>,
-               ann: &'a PpAnn,
+               out: Box<dyn Write+'a>,
+               ann: &'a dyn PpAnn,
                comments: Option<Vec<comments::Comment>>,
                literals: Option<Vec<comments::Literal>>) -> State<'a> {
         State {