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[stdlib] Optional: Allow non-escapable wrapped types #73258

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[stdlib] Optional: Allow non-escapable wrapped types #73258

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c2db193
[stdlib] Optional: Allow non-escapable wrapped types
lorentey Apr 25, 2024
8ab9cb0
[build] Enable NonescapableTypes by default
lorentey Apr 26, 2024
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8 changes: 5 additions & 3 deletions stdlib/public/core/Optional.swift
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Expand Up @@ -118,7 +118,7 @@
/// Unconditionally unwrapping a `nil` instance with `!` triggers a runtime
/// error.
@frozen
public enum Optional<Wrapped: ~Copyable>: ~Copyable {
public enum Optional<Wrapped: ~Copyable & ~Escapable>: ~Copyable, ~Escapable {
// The compiler has special knowledge of Optional<Wrapped>, including the fact
// that it is an `enum` with cases named `none` and `some`.

Expand All @@ -132,9 +132,11 @@ public enum Optional<Wrapped: ~Copyable>: ~Copyable {
case some(Wrapped)
}

extension Optional: Copyable /* where Wrapped: Copyable */ {}
extension Optional: Copyable where Wrapped: ~Escapable {}

extension Optional: Sendable where Wrapped: ~Copyable & Sendable { }
extension Optional: Escapable where Wrapped: ~Copyable {}

extension Optional: Sendable where Wrapped: ~Copyable & ~Escapable & Sendable {}

extension Optional: _BitwiseCopyable where Wrapped: _BitwiseCopyable { }

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2 changes: 1 addition & 1 deletion utils/build_swift/build_swift/driver_arguments.py
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Expand Up @@ -1404,7 +1404,7 @@ def create_argument_parser():
help='Enable experimental Swift distributed actors.')

option('--enable-experimental-nonescapable-types', toggle_true,
default=False,
default=True,
help='Enable experimental NonescapableTypes.')

option('--enable-experimental-string-processing', toggle_true,
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