Messing With Ruby

I’m overriding concatenation here, which completely messes up Ruby’s interactive console:

tsadok$ irb
irb(main):001:0> class String; def +(s); "no"; end; end
=> nil
irb(main):no:0> yes
irb(main):no:0> 1 + 1
irb(main):no:0> puts "hi"
irb(main):no:0> ^D
NameError: undefined local variable or method `nononono' for main:Object
no
irb(main):no:0> ^D
tsadok$

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