Nonescapable stdlib primitives #2657
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The proposed variant is much too limited, and it also introduces a new axis of unsafety that may better be expressed with dedicated API. We do not see any _immediate_ need for bit casting between escapable/nonescapable types, so it seems we can safely defer this work.
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This document proposes to allow
OptionalandResultto hold instances of nonescapable types, and continues the work of adding support for noncopyable and nonescapable types throughout the Swift Standard Library.