class Reline::History

def check_index(index)
+= size if index < 0
ex < -2147483648 or 2147483647 < index
e RangeError.new("integer #{index} too big to convert to `int'")
istory_size is negative, history size is unlimited.
nfig.history_size.positive?
ndex < -@config.history_size or @config.history_size < index
ise RangeError.new("index=<#{index}>")
IndexError.new("index=<#{index}>") if index < 0 or size <= index