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author | Dmitry Petrashko <dmitry.petrashko@gmail.com> | 2015-05-12 18:30:53 +0200 |
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committer | Dmitry Petrashko <dmitry.petrashko@gmail.com> | 2015-05-12 18:30:53 +0200 |
commit | 89bacb9c25a58454ff1878e67f7ea07ffc8c269f (patch) | |
tree | 51f1ff6c66aebe1b6109b1cffcc2bb8e4cf760a3 /tests/pending/run/patmat_unapp_abstype-new.scala | |
parent | a0fa33deafbea1bf53edc068c5ed9db5592822f9 (diff) | |
download | dotty-89bacb9c25a58454ff1878e67f7ea07ffc8c269f.tar.gz dotty-89bacb9c25a58454ff1878e67f7ea07ffc8c269f.tar.bz2 dotty-89bacb9c25a58454ff1878e67f7ea07ffc8c269f.zip |
Run tests as they were in scala.
Diffstat (limited to 'tests/pending/run/patmat_unapp_abstype-new.scala')
-rw-r--r-- | tests/pending/run/patmat_unapp_abstype-new.scala | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/tests/pending/run/patmat_unapp_abstype-new.scala b/tests/pending/run/patmat_unapp_abstype-new.scala new file mode 100644 index 000000000..c2927bd12 --- /dev/null +++ b/tests/pending/run/patmat_unapp_abstype-new.scala @@ -0,0 +1,76 @@ +import reflect.{ClassTag, classTag} + +// abstract types and extractors, oh my! +trait TypesAPI { + trait Type + + type TypeRef <: Type + val TypeRef: TypeRefExtractor; trait TypeRefExtractor { + def apply(x: Int): TypeRef + def unapply(x: TypeRef): Option[(Int)] + } + + // just for illustration, should follow the same pattern as TypeRef + case class MethodType(n: Int) extends Type +} + +// user should not be exposed to the implementation +trait TypesUser extends TypesAPI { + def shouldNotCrash(tp: Type): Unit = { + tp match { + case TypeRef(x) => println("TypeRef") + case MethodType(x) => println("MethodType") + case _ => println("none of the above") + } + } +} + +trait TypesImpl extends TypesAPI { + object TypeRef extends TypeRefExtractor // this will have a bridged unapply(x: Type) = unapply(x.asInstanceOf[TypeRef]) + case class TypeRef(n: Int) extends Type // this has a bridge from TypesAPI#Type to TypesImpl#TypeRef + // --> the cast in the bridge will fail because the pattern matcher can't type test against the abstract types in TypesUser +} + +trait Foos { + trait Bar + type Foo <: Bar + trait FooExtractor { + def unapply(foo: Foo): Option[Int] + } + val Foo: FooExtractor +} + +trait RealFoos extends Foos { + class Foo(val x: Int) extends Bar + object Foo extends FooExtractor { + def unapply(foo: Foo): Option[Int] = Some(foo.x) + } +} + +trait Intermed extends Foos { + def crash(bar: Bar): Unit = + bar match { + case Foo(x) => println("Foo") + case _ => println("Bar") + } +} + +object TestUnappStaticallyKnownSynthetic extends TypesImpl with TypesUser { + def test() = { + shouldNotCrash(TypeRef(10)) // prints "TypeRef" + shouldNotCrash(MethodType(10)) // prints "MethodType" + } +} + +object TestUnappDynamicSynth extends RealFoos with Intermed { + case class NotAFoo(n: Int) extends Bar + def test() = { + crash(NotAFoo(10)) + crash(new Foo(5)) + } +} + +object Test extends App { + TestUnappStaticallyKnownSynthetic.test() + TestUnappDynamicSynth.test() +} |