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Add testcases for use annotations and value classes

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tests
- neg-custom-args/captures
  - cc-annot-value-classes.scala
- pos-custom-args/captures
  - cc-use-iterable.scala

+28

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,18 @@`
	`1`	`+import language.experimental.captureChecking`
	`2`	`+import caps.*`
	`3`	`+`
	`4`	`+class Runner(val x: Int) extends AnyVal:`
	`5`	`+ def runOps(@use ops: List[() => Unit]): Unit =`
	`6`	`+ ops.foreach(_()) // ok`
	`7`	`+`
	`8`	`+class RunnerAlt(val x: Int):`
	`9`	`+ def runOps(@use ops: List[() => Unit]): Unit =`
	`10`	`+ ops.foreach(_()) // ok, of course`
	`11`	`+`
	`12`	`+class RunnerAltAlt(val x: Int) extends AnyVal:`
	`13`	`+ def runOps(ops: List[() => Unit]): Unit =`
	`14`	`+ ops.foreach(_()) // error, as expected`
	`15`	`+`
	`16`	`+class RunnerAltAltAlt(val x: Int):`
	`17`	`+ def runOps(ops: List[() => Unit]): Unit =`
	`18`	`+ ops.foreach(_()) // error, as expected`

Lines changed: 10 additions & 0 deletions

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`@@ -0,0 +1,10 @@`
	`1`	`+import language.experimental.captureChecking`
	`2`	`+trait IterableOnce[+T]`
	`3`	`+trait Iterable[+T] extends IterableOnce[T]:`
	`4`	`+ def flatMap[U](@caps.use f: T => IterableOnce[U]^): Iterable[U]^{this, f*}`
	`5`	`+`
	`6`	`+`
	`7`	`+class IterableOnceExtensionMethods[T](val it: IterableOnce[T]) extends AnyVal:`
	`8`	`+ def flatMap[U](@caps.use f: T => IterableOnce[U]^): IterableOnce[U]^{f*} = it match`
	`9`	`+ case it: Iterable[T] => it.flatMap(f)`
	`10`	`+`

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