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author | Paul Phillips <paulp@improving.org> | 2012-12-25 21:51:18 -0800 |
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committer | Paul Phillips <paulp@improving.org> | 2012-12-26 06:14:41 -0800 |
commit | 6084d2d948bb92c5153e0e4391c3bf80d2eafe38 (patch) | |
tree | de1978ba93b3c194e3361b00cd409cd8681e5e7b /test/files/run/patmat_unapp_abstype-old.scala | |
parent | d2a7aa4ba1c048e52affb0eb2b9167a18dc29c83 (diff) | |
download | scala-6084d2d948bb92c5153e0e4391c3bf80d2eafe38.tar.gz scala-6084d2d948bb92c5153e0e4391c3bf80d2eafe38.tar.bz2 scala-6084d2d948bb92c5153e0e4391c3bf80d2eafe38.zip |
Removed old pattern matcher.
Diffstat (limited to 'test/files/run/patmat_unapp_abstype-old.scala')
-rw-r--r-- | test/files/run/patmat_unapp_abstype-old.scala | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/test/files/run/patmat_unapp_abstype-old.scala b/test/files/run/patmat_unapp_abstype-old.scala deleted file mode 100644 index 45496f08a2..0000000000 --- a/test/files/run/patmat_unapp_abstype-old.scala +++ /dev/null @@ -1,83 +0,0 @@ -// abstract types and extractors, oh my! -trait TypesAPI { - trait Type - - // an alternative fix (implemented in the virtual pattern matcher, is to replace the isInstanceOf by a manifest-based run-time test) - // that's what typeRefMani is for - type TypeRef <: Type //; implicit def typeRefMani: Manifest[TypeRef] - 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") - // the above checks tp.isInstanceOf[TypeRef], which is erased to tp.isInstanceOf[Type] - // before calling TypeRef.unapply(tp), which will then crash unless tp.isInstanceOf[TypesImpl#TypeRef] (which is not implied by tp.isInstanceOf[Type]) - // tp.isInstanceOf[TypesImpl#TypeRef] is equivalent to classOf[TypesImpl#TypeRef].isAssignableFrom(tp.getClass) - // this is equivalent to manifest - // it is NOT equivalent to manifest[Type] <:< typeRefMani - 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 - //lazy val typeRefMani = manifest[TypeRef] -} - -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)) // should and does print "TypeRef" - // once #1697/#2337 are fixed, this should generate the correct output - shouldNotCrash(MethodType(10)) // should print "MethodType" but prints "none of the above" -- good one, pattern matcher! - } -} - -object TestUnappDynamicSynth extends RealFoos with Intermed { - case class FooToo(n: Int) extends Bar - def test() = { - crash(FooToo(10)) - crash(new Foo(5)) - } -} - -object Test extends App { - TestUnappStaticallyKnownSynthetic.test() - TestUnappDynamicSynth.test() -} |