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148518baa0
(https://github.com/ruby/irb/pull/934) Since commands can't be chained with methods, their return values are not intended to be used. But if IRB keeps storing command return values as the last value, and print them, users may rely on such implicit behaviour. So to avoid such confusion, this commit suppresses command's return values. It also updates some commands that currently rely on this implicit behaviour. https://github.com/ruby/irb/commit/fa96bea76f