er and return value types in the closure</span>
-->
<p><span class="caption">リスト13-7: クロージャの引数と戻り値の省略可能な型注釈を追加する</span></p>
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With type annotations added, the syntax of closures looks more similar to the
syntax of functions. The following is a vertical comparison of the syntax for
the definition of a function that adds 1 to its parameter and a closure that
has the same behavior. We’ve added some spaces to line up the relevant parts.
This illustr