Add new syntax for interpolation and repetition, and allow the transcription of separators.

src/libsyntax/ast.rs

@@ -379,7 +379,7 @@ enum token_tree {
     tt_delim(~[token_tree]),
     tt_flat(span, token::token),
     /* These only make sense for right-hand-sides of MBE macros*/
-    tt_dotdotdot(span, ~[token_tree]),
+    tt_dotdotdot(span, ~[token_tree], option<token::token>, bool),
     tt_interpolate(span, ident)
 }