Deny bare trait objects in src/libsyntax_ext

src/libsyntax_ext/deriving/debug.rs

@@ -23,7 +23,7 @@ pub fn expand_deriving_debug(cx: &mut ExtCtxt,
                              span: Span,
                              mitem: &MetaItem,
                              item: &Annotatable,
-                             push: &mut FnMut(Annotatable)) {
+                             push: &mut dyn FnMut(Annotatable)) {
     // &mut ::std::fmt::Formatter
     let fmtr = Ptr(Box::new(Literal(path_std!(cx, fmt::Formatter))),
                    Borrowed(None, ast::Mutability::Mutable));