diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 382b81e1c4d2..1704e3afc543 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -1,11 +1,11 @@
 import std::map::hashmap;
 
-import ast::{crate, expr_, expr_mac, mac_invoc};
+import ast::{crate, expr_, expr_mac, mac_invoc, mac_invoc_tt,
+             tt_delim, tt_flat};
 import fold::*;
 import ext::base::*;
 import ext::qquote::{qq_helper};
-import parse::parser;
-import parse::parse_expr_from_source_str;
+import parse::{parser, parse_expr_from_source_str, new_parser_from_tt};
 
 
 import codemap::{span, expanded_from};
@@ -49,10 +49,6 @@ fn expand_expr(exts: hashmap<str, syntax_extension>, cx: ext_ctxt,
                   }
                 }
               }
-              /*
-              mac_invoc_tt(path, body) {
-                let p = new_parser_from_tt(cx.sess, cx.cfg, )
-              }*/
               _ { cx.span_bug(mac.span, "naked syntactic bit") }
             }
           }
diff --git a/src/libsyntax/parse.rs b/src/libsyntax/parse.rs
index cd6fc0be31cd..b483e1eb9e4d 100644
--- a/src/libsyntax/parse.rs
+++ b/src/libsyntax/parse.rs
@@ -2,17 +2,14 @@
 import dvec::extensions;
 
 export parse_sess;
-export new_parse_sess;
-export new_parse_sess_special_handler;
+export new_parse_sess, new_parse_sess_special_handler;
 export next_node_id;
-export new_parser_from_file;
-export new_parser_etc_from_file;
+export new_parser_from_file, new_parser_etc_from_file;
 export new_parser_from_source_str;
-export parse_crate_from_file;
-export parse_crate_from_crate_file;
+export new_parser_from_tt;
+export parse_crate_from_file, parse_crate_from_crate_file;
 export parse_crate_from_source_str;
-export parse_expr_from_source_str;
-export parse_item_from_source_str;
+export parse_expr_from_source_str, parse_item_from_source_str;
 export parse_from_source_str;
 
 import parser::parser;
@@ -199,7 +196,7 @@ fn new_parser_from_file(sess: parse_sess, cfg: ast::crate_cfg, +path: str,
 }
 
 fn new_parser_from_tt(sess: parse_sess, cfg: ast::crate_cfg,
-                      tt: ast::token_tree) -> parser {
+                      tt: [ast::token_tree]) -> parser {
     let trdr = lexer::new_tt_reader(sess.span_diagnostic, sess.interner, tt);
     ret parser(sess, cfg, trdr as reader, parser::SOURCE_FILE)
 }
diff --git a/src/libsyntax/parse/lexer.rs b/src/libsyntax/parse/lexer.rs
index 51ab3085eaf2..ff4c9f5811e1 100644
--- a/src/libsyntax/parse/lexer.rs
+++ b/src/libsyntax/parse/lexer.rs
@@ -4,7 +4,7 @@ import diagnostic;
 import ast::{tt_delim,tt_flat};
 
 export reader, string_reader, new_string_reader, is_whitespace;
-export tt_reader, new_tt_reader;
+export tt_reader,  new_tt_reader;
 export nextch, is_eof, bump, get_str_from;
 export string_reader_as_reader, tt_reader_as_reader;
 
@@ -20,8 +20,8 @@ enum tt_frame_up { /* to break a circularity */
     tt_frame_up(option<tt_frame>)
 }
 
+#[doc = "an unzipping of `token_tree`s"]
 type tt_frame = @{
-    /* invariant: readme[idx] is always a tt_flat */
     readme: [ast::token_tree],
     mut idx: uint,
     up: tt_frame_up
@@ -37,10 +37,10 @@ type tt_reader = @{
 };
 
 fn new_tt_reader(span_diagnostic: diagnostic::span_handler,
-                 itr: @interner::interner<@str>, src: ast::token_tree)
+                 itr: @interner::interner<@str>, src: [ast::token_tree])
     -> tt_reader {
     let r = @{span_diagnostic: span_diagnostic, interner: itr,
-              mut cur: @{readme: [src], mut idx: 0u,
+              mut cur: @{readme: src, mut idx: 0u,
                          up: tt_frame_up(option::none)},
               mut cur_tok: token::EOF, /* dummy value, never read */
               mut cur_chpos: 0u /* dummy value, never read */