[racket] [plt-edu-talk] Does a Scheme procedure "return" a value?

A Scheme procedure might return a value, or it might delegate to another
procedure (via tail recursion).  This is a key point: languages without
tail recursion cannot delegate to another procedure. They can do a limited
simulation of delegation by chaining the returns, but this adds an O(n)
space overhead to the computation and consumes stack space, which is a
finite resource (hence the limit).
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