The expander in racket adds something equivalent to
[else (void)]
if there is no else clause. (Try an example with the Macro Stepper.) So an
explicit else clause would not change the speed of the programs.
In some cases the compiler can prove that the else part is not necessary
and drop it, Also, I think that the compiler in RacketCS can notice that it
has no side effects and also drop it if the result is ignored (but I'm not
100% sure).
Gustavo
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