Slightly better error message (UnexpectedToken)

lark/exceptions.py

@@ -81,8 +81,8 @@ class UnexpectedToken(ParseError, UnexpectedInput):
         self.pos_in_stream = getattr(token, 'pos_in_stream', None)
 
         message = ("Unexpected token %r at line %s, column %s.\n"
-                   "Expected: %s\n"
-                   % (token, self.line, self.column, ', '.join(self.expected)))
+                   "Expected one of: \n\t* %s\n"
+                   % (token, self.line, self.column, '\n\t* '.join(self.expected)))
 
         super(UnexpectedToken, self).__init__(message)
 

lark/parsers/lalr_parser.py

@@ -45,7 +45,7 @@ class _Parser:
             try:
                 return states[state][key]
             except KeyError:
-                expected = states[state].keys()
+                expected = [s for s in states[state].keys() if s.isupper()]
                 raise UnexpectedToken(token, expected, state=state)  # TODO filter out rules from expected
 
         def reduce(rule):