Maintenance Ruby 3.4 gets fixes, but no new features. Switch to Ruby 4.0 →
class method
Readline.ungetc
ungetc(c)
lib/reline.rb
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# File tmp/rubies/ruby-3.4.1/lib/reline.rb, line 502
def self.ungetc(c)
core.io_gate.ungetc(c)
end
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