diff --git a/parso/parser.py b/parso/parser.py
index ebf8554..df4aea4 100644
--- a/parso/parser.py
+++ b/parso/parser.py
@@ -54,24 +54,7 @@ class InternalParseError(Exception):
 
 
 class Stack(list):
-    def get_tos_nodes(self):
-        tos = self[-1]
-        return tos[2][1]
-
-    def get_tos_first_tokens(self, grammar):
-        tos = self[-1]
-        inv_tokens = dict((v, k) for k, v in grammar.tokens.items())
-        inv_keywords = dict((v, k) for k, v in grammar.keywords.items())
-        dfa, state, nodes = tos
-
-        def check():
-            for first in dfa[1]:
-                try:
-                    yield inv_keywords[first]
-                except KeyError:
-                    yield tokenize.tok_name[inv_tokens[first]]
-
-        return sorted(check())
+    pass
 
 
 class StackNode(object):