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Begin doesn't introduce new "block" like
let, that is,
you can't place "internal define" at the beginning of forms
begin behaves as if forms
are spliced into the surrounding context.
For example, topleve expression like the following is the same
as two toplevel definitions:
(begin (define x 1) (define y 2))
Here's a trickier example:
(let () (begin (define x 2) (begin (define y 3) )) (+ x y)) == (let () (define x 2) (define y 3) (+ x y))
begin, this does creates a "block",
begin0 form is expanded as follows.
(receive tmp exp0 exp1 ... (apply values tmp))