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caps.scala
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caps.scala
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package scala
import annotation.experimental
@experimental object caps:
class Cap // should be @erased
/** The universal capture reference (deprecated) */
@deprecated("Use `cap` instead")
val `*`: Cap = cap
/** The universal capture reference */
val cap: Cap = Cap()
given Cap = cap
/** Reach capabilities x* which appear as terms in @retains annotations are encoded
* as `caps.reachCapability(x)`. When converted to CaptureRef types in capture sets
* they are represented as `x.type @annotation.internal.reachCapability`.
*/
extension (x: Any) def reachCapability: Any = x
object unsafe:
extension [T](x: T)
/** A specific cast operation to remove a capture set.
* If argument is of type `T^C`, assume it is of type `T` instead.
* Calls to this method are treated specially by the capture checker.
*/
def unsafeAssumePure: T = x
/** If argument is of type `cs T`, converts to type `box cs T`. This
* avoids the error that would be raised when boxing `*`.
*/
@deprecated(since = "3.3")
def unsafeBox: T = x
/** If argument is of type `box cs T`, converts to type `cs T`. This
* avoids the error that would be raised when unboxing `*`.
*/
@deprecated(since = "3.3")
def unsafeUnbox: T = x
extension [T, U](f: T => U)
/** If argument is of type `box cs T`, converts to type `cs T`. This
* avoids the error that would be raised when unboxing `*`.
*/
@deprecated(since = "3.3")
def unsafeBoxFunArg: T => U = f
end unsafe