Fix for tree_matcher

lark/tree_matcher.py

@@ -81,7 +81,8 @@ class TreeMatcher:
     def __init__(self, parser):
         # XXX TODO calling compile twice returns different results!
         assert parser.options.maybe_placeholders == False
-        self.tokens, rules, _extra = parser.grammar.compile(parser.options.start)
+        # XXX TODO: we just ignore the potential existence of a postlexer
+        self.tokens, rules, _extra = parser.grammar.compile(parser.options.start, set())
 
         self.rules_for_root = defaultdict(list)