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Don't always consider an inout_aliasable argument to have
escaped. AccessEnforcementSelection has already done that analysis and left
begin_access [dynamic] artifacts if the argument has escaped in any meaningful
way. Use that information to
Essential for supporting autoclosures that call mutating methods on span-like
things. Such as UTF8Span.UnicodeScalarIterator.skipForward():
e.g. while numSkipped < n && skipForward() != 0 { ... }