gist for https://attonblog.blogspot.com/2020/03/set-pry-history-file-with-backward-compatibility.html

error.txt

Error loading /root/.config/pry/pryrc: undefined method `file=' for #<Pry::History:0x00005624d9ce6298>
Did you mean?  filter
/root/.config/pry/pryrc:1:in `__pry__'

new_config.rb

@history_path = File.expand_path('path/to/history')

if Pry.config.respond_to?(:history_file=)
  Pry.config.history_file = @history_path.clone
else
  Pry.config.history.file = @history_path.clone
end

remove_instance_variable(:@history_path)

old_config.rb

  Pry.config.history.file = File.expand_path('path/to/history')

warning.txt

<main>:1: warning: __FILE__ in eval may not return location in binding; use Binding#source_location instead
/usr/local/bundle/gems/pry-0.12.2/lib/pry/commands/whereami.rb:40: warning: in `eval'
<main>:1: warning: __LINE__ in eval may not return location in binding; use Binding#source_location instead
/usr/local/bundle/gems/pry-0.12.2/lib/pry/commands/whereami.rb:41: warning: in `eval'
<main>:1: warning: __FILE__ in eval may not return location in binding; use Binding#source_location instead
/usr/local/bundle/gems/pry-0.12.2/lib/pry/method/weird_method_locator.rb:88: warning: in `eval'
<main>:1: warning: __FILE__ in eval may not return location in binding; use Binding#source_location instead
/usr/local/bundle/gems/pry-0.12.2/lib/pry/method/weird_method_locator.rb:80: warning: in `eval'