Avoid interpolated token trees.

2 files changed, 3 insertions, 17 deletions

diff --git a/src/libsyntax/ext/tt/macro_parser.rs b/src/libsyntax/ext/tt/macro_parser.rs
index 46ffc93d2ee..834ece97af5 100644
--- a/src/libsyntax/ext/tt/macro_parser.rs
+++ b/src/libsyntax/ext/tt/macro_parser.rs
@@ -480,23 +480,8 @@ fn parse_nt<'a>(p: &mut Parser<'a>, sp: Span, name: &str) -> Nonterminal {
     match name {
         "tt" => {
             p.quote_depth += 1; //but in theory, non-quoted tts might be useful
-            let mut tt = panictry!(p.parse_token_tree());
+            let tt = panictry!(p.parse_token_tree());
             p.quote_depth -= 1;
-            while let TokenTree::Token(sp, token::Interpolated(nt)) = tt {
-                if let token::NtTT(..) = *nt {
-                    match Rc::try_unwrap(nt) {
-                        Ok(token::NtTT(sub_tt)) => tt = sub_tt,
-                        Ok(_) => unreachable!(),
-                        Err(nt_rc) => match *nt_rc {
-                            token::NtTT(ref sub_tt) => tt = sub_tt.clone(),
-                            _ => unreachable!(),
-                        },
-                    }
-                } else {
-                    tt = TokenTree::Token(sp, token::Interpolated(nt.clone()));
-                    break
-                }
-            }
             return token::NtTT(tt);
         }
         _ => {}
diff --git a/src/libsyntax/ext/tt/transcribe.rs b/src/libsyntax/ext/tt/transcribe.rs
index bf6851ec1dc..38becbe7b1d 100644
--- a/src/libsyntax/ext/tt/transcribe.rs
+++ b/src/libsyntax/ext/tt/transcribe.rs
@@ -12,7 +12,7 @@ use self::LockstepIterSize::*;
 use ast::Ident;
 use errors::Handler;
 use ext::tt::macro_parser::{NamedMatch, MatchedSeq, MatchedNonterminal};
-use parse::token::{self, MatchNt, SubstNt, Token, NtIdent};
+use parse::token::{self, MatchNt, SubstNt, Token, NtIdent, NtTT};
 use syntax_pos::{Span, DUMMY_SP};
 use tokenstream::{self, TokenTree};
 use util::small_vector::SmallVector;
@@ -241,6 +241,7 @@ fn tt_next_token(r: &mut TtReader, prev_span: Span) -> Option<TokenTree> {
                             NtIdent(ref sn) => {
                                 return Some(TokenTree::Token(sn.span, token::Ident(sn.node)));
                             }
+                            NtTT(ref tt) => return Some(tt.clone()),
                             _ => {
                                 // FIXME(pcwalton): Bad copy
                                 return Some(TokenTree::Token(sp, token::Interpolated(nt.clone())));