extract_callstack

# File activesupport/lib/active_support/deprecation/reporting.rb, line 140
        def extract_callstack(callstack)
          return [] if callstack.empty?

          offending_line = callstack.find { |frame|
            # Code generated with `eval` doesn't have an `absolute_path`, e.g. templates.
            path = frame.absolute_path || frame.path
            path && !ignored_callstack?(path)
          } || callstack.first

          [offending_line.path, offending_line.lineno, offending_line.label]
        end