2.24 Blocks: block
The bindings documented in this section are provided by the racket/block library, not racket/base or racket.
(block defn-or-expr ...)
Supports a mixture of expressions and mutually recursive definitions,
as in a module body. Unlike an internal-definition
context, the last defn-or-expr need not be an expression.
The result of the block form is the result of the last defn-or-expr if it is an expression, #<void> otherwise. If no defn-or-expr is provided (after flattening begin forms), the result is #<void>.
The final defn-or-expr is executed in tail position, if it is an expression.
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