Gem warnings

[knu]

The following message is shown when evaluating pp 1 in play-ruby:

Ignoring debug-1.9.1 because its extensions are not built. Try: gem pristine debug --version 1.9.1
Ignoring racc-1.7.3 because its extensions are not built. Try: gem pristine racc --version 1.7.3
Ignoring rbs-3.4.0 because its extensions are not built. Try: gem pristine rbs --version 3.4.0
1

https://ruby.github.io/play-ruby/?code=pp+1