p>This version is for something like <code>Enumerable#each</code> where the block is used
only in the context of this method and never again.  The Swift closure does not have
to be escaping or sendable.</p>
<p>If the method you’re calling retains the block in some way, associating it with the called
or returned object for future use, then the Swift closure must be both escaping and sendable
and you must call the method with <a href="../types/rbobjectaccess1.html?swift#callsymbolargskwargsblockretentionblo