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Even a program of a single instruction can have bugs
The previous entry [1] reminded of the following computer joke:
> Every program has at least one bug and can be shortened by at least one
> instruction—from which, by induction, one can deduce that every program can
> be reduced to one instruction which doesn't work.
>
Only it's not a joke—it really happened! [2]
[1]
gopher://gopher.conman.org/0Phlog:2015/02/02.1
[2]
http://en.wikipedia.org/wiki/IEFBR14#Implementation
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