pyenv/rbenv.d/exec/gem-rehash/rubygems_plugin.rb

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hook = lambda do |installer|
begin
# Ignore gems that aren't installed in locations that rbenv searches for binstubs
if installer.spec.executables.any? &&
[Gem.default_bindir, Gem.bindir(Gem.user_dir)].include?(installer.bin_dir)
system "rbenv", "rehash"
end
rescue
warn "rbenv: error in gem-rehash (#{$!})"
end
end
begin
Gem.post_install(&hook)
Gem.post_uninstall(&hook)
rescue
warn "rbenv: error installing gem-rehash hooks (#{$!})"
end