# File lib/error_highlight/core_ext.rb, line 11
def to_s
  msg = super.dup

  locs = backtrace_locations
  return msg unless locs

  loc = locs.first
  begin
    node = RubyVM::AbstractSyntaxTree.of(loc, keep_script_lines: true)
    opts = {}

    case self
    when NoMethodError, NameError
      opts[:point_type] = :name
      opts[:name] = name
    when TypeError, ArgumentError
      opts[:point_type] = :args
    end

    spot = ErrorHighlight.spot(node, **opts)

  rescue SyntaxError
  rescue SystemCallError # file not found or something
  rescue ArgumentError   # eval'ed code
  end

  if spot
    points = ErrorHighlight.formatter.message_for(spot)
    msg << points if !msg.include?(points)
  end

  msg
end