Beginning of support for interpolation into token trees.

src/libsyntax/parse/lexer.rs

@@ -45,7 +45,7 @@ fn new_tt_reader(span_diagnostic: diagnostic::span_handler,
               mut cur_tok: token::EOF, /* dummy value, never read */
               mut cur_chpos: 0u /* dummy value, never read */
              };
-    //tt_next_token(r); /* get cur_tok and cur_chpos set up */
+    tt_next_token(r); /* get cur_tok and cur_chpos set up */
     ret r;
 }
 

src/libsyntax/parse/token.rs

@@ -77,9 +77,25 @@ enum token {
     /* Name components */
     IDENT(str_num, bool),
     UNDERSCORE,
+
+    //ACTUALLY(whole_nonterminal),
+
     EOF,
 }
 
+#[auto_serialize]
+#[doc = "For interpolation during macro expansion."]
+enum whole_nonterminal {
+    w_item(@ast::item),
+    w_block(ast::blk),
+    w_stmt(@ast::stmt),
+    w_pat( @ast::pat),
+    w_expr(@ast::expr),
+    w_ty(  @ast::ty),
+    w_ident(ast::ident),
+    w_path(@ast::path),
+}
+
 fn binop_to_str(o: binop) -> str {
     alt o {
       PLUS { "+" }