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Make unchecked cases non-
@unchecked and non-unreachable
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| -- Error: tests/neg/i16451.scala:20:9 ---------------------------------------------------------------------------------- | ||
| 20 | case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Red : Color)] cannot be checked at runtime because its type arguments can't be determined from Wrapper[Color] | ||
| -- Error: tests/neg/i16451.scala:21:9 ---------------------------------------------------------------------------------- | ||
| 21 | case x: Wrapper[Color.Green.type] => None // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Green : Color)] cannot be checked at runtime because its type arguments can't be determined from Wrapper[Color] | ||
| -- Error: tests/neg/i16451.scala:28:9 ---------------------------------------------------------------------------------- | ||
| 28 | case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Red : Color)] cannot be checked at runtime because its type arguments can't be determined from Any | ||
| -- Error: tests/neg/i16451.scala:32:9 ---------------------------------------------------------------------------------- | ||
| 32 | case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Red : Color)] cannot be checked at runtime because its type arguments can't be determined from Wrapper[Color] | ||
| -- Error: tests/neg/i16451.scala:36:9 ---------------------------------------------------------------------------------- | ||
| 36 | case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Red : Color)] cannot be checked at runtime because its type arguments can't be determined from A1 | ||
| -- Error: tests/neg/i16451.scala:41:11 --------------------------------------------------------------------------------- | ||
| 41 | case x: Wrapper[Color.Red.type] => x // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Red : Color)] cannot be checked at runtime because its type arguments can't be determined from Wrapper[Color] | ||
| -- Error: tests/neg/i16451.scala:46:11 --------------------------------------------------------------------------------- | ||
| 46 | case x: Wrapper[Color.Red.type] => x // error | ||
| | ^ | ||
| |the type test for Wrapper[(Color.Red : Color)] cannot be checked at runtime because its type arguments can't be determined from Wrapper[Color] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // scalac: -Werror | ||
| enum Color: | ||
| case Red, Green | ||
| //sealed trait Color | ||
| //object Color: | ||
| // case object Red extends Color | ||
| // case object Green extends Color | ||
|
|
||
| case class Wrapper[A](value: A) | ||
| //object Wrapper: | ||
| //import scala.reflect.TypeTest | ||
| //given TypeTest[Wrapper[Color], Wrapper[Color.Red.type]] with | ||
| // def unapply(x: Wrapper[Color]): Option[x.type & Wrapper[Color.Red.type]] = | ||
| // if x.value == Color.Red then | ||
| // Some(x.asInstanceOf[x.type & Wrapper[Color.Red.type]]) | ||
| // else None | ||
|
|
||
| object Test: | ||
| def test_correct(x: Wrapper[Color]): Option[Wrapper[Color.Red.type]] = x match | ||
| case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| case x: Wrapper[Color.Green.type] => None // error | ||
|
|
||
| def test_different(x: Wrapper[Color]): Option[Wrapper[Color]] = x match | ||
| case x @ Wrapper(_: Color.Red.type) => Some(x) | ||
| case x @ Wrapper(_: Color.Green.type) => None | ||
|
|
||
| def test_any(x: Any): Option[Wrapper[Color.Red.type]] = x match | ||
| case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| case _ => None | ||
|
|
||
| def test_wrong(x: Wrapper[Color]): Option[Wrapper[Color.Red.type]] = x match | ||
| case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| case _ => None | ||
|
|
||
| def t2[A1 <: Wrapper[Color]](x: A1): Option[Wrapper[Color.Red.type]] = x match | ||
| case x: Wrapper[Color.Red.type] => Some(x) // error | ||
| case _ => None | ||
|
|
||
| def test_wrong_seq(xs: Seq[Wrapper[Color]]): Seq[Wrapper[Color.Red.type]] = | ||
| xs.collect { | ||
| case x: Wrapper[Color.Red.type] => x // error | ||
| } | ||
|
|
||
| def test_wrong_seq2(xs: Seq[Wrapper[Color]]): Seq[Wrapper[Color.Red.type]] = | ||
| xs.collect { x => x match | ||
| case x: Wrapper[Color.Red.type] => x // error | ||
| } | ||
|
|
||
| def main(args: Array[String]): Unit = | ||
| println(test_wrong_seq(Seq(Wrapper(Color.Red), Wrapper(Color.Green)))) | ||
| // outputs: List(Wrapper(Red), Wrapper(Green)) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| 4: Pattern Match |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| // scalac: -Werror | ||
| abstract class Namer: | ||
| private enum CanForward: | ||
| case Yes | ||
| case No(whyNot: String) | ||
| case Skip // for members that have never forwarders | ||
|
|
||
| class Mbr | ||
| private def canForward(mbr: Mbr): CanForward = CanForward.Yes | ||
|
|
||
| private def applyOrElse[A1 <: CanForward, B1 >: String](x: A1, default: A1 => B1): B1 = x match | ||
| case CanForward.No(whyNot @ _) => whyNot | ||
| case _ => "" | ||
|
|
||
| def addForwardersNamed(mbrs: List[Mbr]) = | ||
| val reason = mbrs.map(canForward).collect { | ||
| case CanForward.No(whyNot) => whyNot | ||
| }.headOption.getOrElse("") | ||
|
|
||
| class ClassCompleter: | ||
| def addForwardersNamed(mbrs: List[Mbr]) = | ||
| val reason = mbrs.map(canForward).collect { | ||
| case CanForward.No(whyNot) => whyNot | ||
| }.headOption.getOrElse("") | ||
|
|
||
| private def exportForwarders = | ||
| def addForwardersNamed(mbrs: List[Mbr]) = | ||
| val reason = mbrs.map(canForward).collect { | ||
| case CanForward.No(whyNot) => whyNot | ||
| }.headOption.getOrElse("") | ||
| if mbrs.size == 4 then | ||
| val reason = mbrs.map(canForward).collect { | ||
| case CanForward.No(whyNot) => whyNot | ||
| }.headOption.getOrElse("") |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| // scalac: -Werror | ||
| object DiffUtil: | ||
| private sealed trait Patch | ||
| private final case class Unmodified(str: String) extends Patch | ||
| private final case class Modified(original: String, str: String) extends Patch | ||
| private final case class Deleted(str: String) extends Patch | ||
| private final case class Inserted(str: String) extends Patch | ||
|
|
||
| private def test(diff: Array[Patch]) = | ||
| diff.collect { | ||
| case Unmodified(str) => str | ||
| case Inserted(str) => s"+$str" | ||
| case Modified(orig, str) => s"{$orig,$str}" | ||
| case Deleted(str) => s"-$str" | ||
| }.mkString |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| // scalac: -Werror | ||
|
|
||
| import java.lang.reflect.* | ||
| import scala.annotation.tailrec | ||
|
|
||
| class Test: | ||
| @tailrec private def unwrapThrowable(x: Throwable): Throwable = x match { | ||
| case _: InvocationTargetException | // thrown by reflectively invoked method or constructor | ||
| _: ExceptionInInitializerError | // thrown when running a static initializer (e.g. a scala module constructor) | ||
| _: UndeclaredThrowableException | // invocation on a proxy instance if its invocation handler's `invoke` throws an exception | ||
| _: ClassNotFoundException | // no definition for a class instantiated by name | ||
| _: NoClassDefFoundError // the definition existed when the executing class was compiled, but can no longer be found | ||
| if x.getCause != null => | ||
| unwrapThrowable(x.getCause) | ||
| case _ => x | ||
| } | ||
|
|
||
| private def unwrapHandler[T](pf: PartialFunction[Throwable, T]): PartialFunction[Throwable, T] = | ||
| pf.compose({ case ex => unwrapThrowable(ex) }) | ||
|
|
||
| def test = | ||
| unwrapHandler({ case ex => throw ex }) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| scala.List.apply[scala.PartialFunction[scala.Int, scala.Predef.String]](((x$1: scala.Int) => (x$1: @scala.unchecked) match { | ||
| scala.List.apply[scala.PartialFunction[scala.Int, scala.Predef.String]](((x$1: scala.Int) => x$1 match { | ||
| case 1 => | ||
| "x" | ||
| })) |