A Rust program is (mostly) made up of a series of statements:
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There are a few kinds of statements in Rust. The most common two are declaring
a variable binding, and using a ; with an expression:
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Blocks are expressions too, so they can be used as values in
assignments. The last expression in the block will be assigned to the
place expression such as a local variable. However, if the last expression of the block ends with a
semicolon, the return value will be ().
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