Revert "Change `fold_tt` and `fold_tts` to take token trees by value (instead of by reference)"

This reverts commit 5bf7970ac70b4e7781e7b2f3816720aa62fac6fd.

1 files changed, 11 insertions, 5 deletions

diff --git a/src/libsyntax/ext/quote.rs b/src/libsyntax/ext/quote.rs
index 68527b0797d..ffc950d76dd 100644
--- a/src/libsyntax/ext/quote.rs
+++ b/src/libsyntax/ext/quote.rs
@@ -32,6 +32,7 @@ pub mod rt {
     use ext::base::ExtCtxt;
     use parse::{self, token, classify};
     use ptr::P;
+    use std::rc::Rc;
 
     use tokenstream::{self, TokenTree};
 
@@ -215,12 +216,12 @@ pub mod rt {
             if self.node.style == ast::AttrStyle::Inner {
                 r.push(TokenTree::Token(self.span, token::Not));
             }
-            r.push(TokenTree::Delimited(self.span, tokenstream::Delimited {
+            r.push(TokenTree::Delimited(self.span, Rc::new(tokenstream::Delimited {
                 delim: token::Bracket,
                 open_span: self.span,
                 tts: self.node.value.to_tokens(cx),
                 close_span: self.span,
-            }));
+            })));
             r
         }
     }
@@ -235,12 +236,12 @@ pub mod rt {
 
     impl ToTokens for () {
         fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-            vec![TokenTree::Delimited(DUMMY_SP, tokenstream::Delimited {
+            vec![TokenTree::Delimited(DUMMY_SP, Rc::new(tokenstream::Delimited {
                 delim: token::Paren,
                 open_span: DUMMY_SP,
                 tts: vec![],
                 close_span: DUMMY_SP,
-            })]
+            }))]
         }
     }
 
@@ -791,9 +792,14 @@ fn statements_mk_tt(cx: &ExtCtxt, tt: &TokenTree, matcher: bool) -> Vec<ast::Stm
                                 id_ext("tokenstream"),
                                 id_ext("SequenceRepetition")];
             let e_seq_struct = cx.expr_struct(sp, cx.path_global(sp, seq_path), fields);
+            let e_rc_new = cx.expr_call_global(sp, vec![id_ext("std"),
+                                                        id_ext("rc"),
+                                                        id_ext("Rc"),
+                                                        id_ext("new")],
+                                                   vec![e_seq_struct]);
             let e_tok = cx.expr_call(sp,
                                      mk_tt_path(cx, sp, "Sequence"),
-                                     vec!(e_sp, e_seq_struct));
+                                     vec!(e_sp, e_rc_new));
             let e_push =
                 cx.expr_method_call(sp,
                                     cx.expr_ident(sp, id_ext("tt")),