class RuboCop::Cop::Style::HashSyntax

def autocorrect_ruby19(corrector, node)
  key = node.children.first.source_range
  op = node.loc.operator
  range = Parser::Source::Range.new(key.source_buffer,
                                    key.begin_pos, op.end_pos)
  range = range_with_surrounding_space(range, :right)
  corrector.replace(range,
                    range.source.sub(/^:(.*\S)\s*=>\s*$/, '\1: '))
end