Small fix: Use OrderedSet

lark/parsers/earley.py

@@ -282,7 +282,7 @@ def parse(self, lexer, start):
         # If the parse was successful, the start
         # symbol should have been completed in the last step of the Earley cycle, and will be in
         # this column. Find the item for the start_symbol, which is the root of the SPPF tree.
-        solutions = list({n.node for n in columns[-1] if n.is_complete and n.node is not None and n.s == start_symbol and n.start == 0})
+        solutions = list(OrderedSet([n.node for n in columns[-1] if n.is_complete and n.node is not None and n.s == start_symbol and n.start == 0]))
         if not solutions:
             expected_terminals = [t.expect.name for t in to_scan]
             raise UnexpectedEOF(expected_terminals, state=frozenset(i.s for i in to_scan))