[6.2] LifetimeDependence type check: infer trivial _read accessor #82269
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This fixes a small oversight in the type checker's LifetimeDependence
inference. Allow inference on _read accessors even when 'self' is a trivial
type. This is needed because the compiler synthesizes a _read accessor even when
the user defines a getter (this is probably a mistake, but it's easire to just
fix inference at this point). There is no workaround because it defining both a
getter and '_read' is illegal!
extension UnsafeMutableRawBufferPointer {
var mutableBytes: MutableRawSpan {
@_lifetime(borrow self)
get {
unsafe MutableRawSpan(_unsafeBytes: self)
}
}
}
Fixes rdar://153346478 (Can't compile the
UnsafeMutableRawBufferPointer.mutableBytes property)
(cherry picked from commit 125a086)
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@swift-ci test |
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@swift-ci test macOS platform |
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tbkka
approved these changes
Jun 17, 2025
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(cherry picked from commit 125a086)
--- CCC ---
Explanation: This fixes a small oversight in the type checker's LifetimeDependence inference. Allow inference on _read accessors even when 'self' is a trivial type. This is needed because the compiler synthesizes a _read accessor even when the user defines a getter (this is probably a mistake, but it's easire to just fix inference at this point). There is no workaround because it defining both a getter and '_read' is illegal! Allows:
Scope: Only affects users of the supported experiment Lifetimes feature.
Radar/SR Issue: rdar://153346478 (Can't compile the UnsafeMutableRawBufferPointer.mutableBytes property)
main PR: #82268
Risk: Low
Testing: Added unit tests
Reviewer: Meghana Gupta