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author | Eugene Burmako <xeno.by@gmail.com> | 2013-12-28 21:08:34 -0800 |
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committer | Eugene Burmako <xeno.by@gmail.com> | 2013-12-28 21:08:34 -0800 |
commit | 6834cc2278ad522e49493b624da95bfa00af1604 (patch) | |
tree | de1e0c9d771f24d8fac54649880f422231df88e7 | |
parent | 4fd523907af66099fc92417cbecc2e17239f11bb (diff) | |
parent | 4b9e8e34171e2162af2b1ce7faef45c31814a477 (diff) | |
download | scala-6834cc2278ad522e49493b624da95bfa00af1604.tar.gz scala-6834cc2278ad522e49493b624da95bfa00af1604.tar.bz2 scala-6834cc2278ad522e49493b624da95bfa00af1604.zip |
Merge pull request #3311 from xeno-by/topic/fine-points-of-whiteboxity-master
(master) codifies the state of the art wrt SI-8104
-rw-r--r-- | test/files/neg/t8104.check | 4 | ||||
-rw-r--r-- | test/files/neg/t8104/Macros_1.scala | 11 | ||||
-rw-r--r-- | test/files/neg/t8104/Test_2.scala | 21 | ||||
-rw-r--r-- | test/files/run/t8104.check | 1 | ||||
-rw-r--r-- | test/files/run/t8104/Macros_1.scala | 11 | ||||
-rw-r--r-- | test/files/run/t8104/Test_2.scala | 16 |
6 files changed, 64 insertions, 0 deletions
diff --git a/test/files/neg/t8104.check b/test/files/neg/t8104.check new file mode 100644 index 0000000000..69b3461bd5 --- /dev/null +++ b/test/files/neg/t8104.check @@ -0,0 +1,4 @@ +Test_2.scala:20: error: could not find implicit value for parameter e: Generic.Aux[Test.C,(Int, Int)] + implicitly[Generic.Aux[C, (Int, Int)]] + ^ +one error found diff --git a/test/files/neg/t8104/Macros_1.scala b/test/files/neg/t8104/Macros_1.scala new file mode 100644 index 0000000000..21d81a3687 --- /dev/null +++ b/test/files/neg/t8104/Macros_1.scala @@ -0,0 +1,11 @@ +import scala.reflect.macros.WhiteboxContext + +object Macros { + def impl[T](c: WhiteboxContext)(implicit T: c.WeakTypeTag[T]) = { + import c.universe._ + import definitions._ + val fields = T.tpe.declarations.toList.collect{ case x: TermSymbol if x.isVal && x.isCaseAccessor => x } + val Repr = appliedType(TupleClass(fields.length).asType.toType, fields.map(_.typeSignature)) + q"new Generic[$T]{ type Repr = $Repr }" + } +}
\ No newline at end of file diff --git a/test/files/neg/t8104/Test_2.scala b/test/files/neg/t8104/Test_2.scala new file mode 100644 index 0000000000..585f76c00f --- /dev/null +++ b/test/files/neg/t8104/Test_2.scala @@ -0,0 +1,21 @@ +trait Generic[T] { type Repr } +object Generic { + type Aux[T, Repr0] = Generic[T] { type Repr = Repr0 } + import scala.language.experimental.macros + implicit def materializeGeneric[T]: Generic[T] = macro Macros.impl[T] +} + +object Test extends App { + case class C(x: Int, y: Int) + + import scala.reflect.runtime.universe._ + def reprify[T, Repr](x: T)(implicit generic: Generic.Aux[T, Repr], tag: TypeTag[Repr]) = println(tag) + reprify(C(40, 2)) + + // this is a compilation error at the moment as explained in SI-8104 + // because matchesPt in implicit search says that depoly(<type of materializeGeneric>) isn't a subtype of Generic.Aux[C, (Int, Int)] + // which is rightfully so, because depoly only replaces type parameters, not type members with wildcard types + // however in the future we might want to relax the matchesPt check, so this might start compiling + // therefore, if you've broken this test, then you should be happy, because most likely you've just enabled an interesting use case! + implicitly[Generic.Aux[C, (Int, Int)]] +} diff --git a/test/files/run/t8104.check b/test/files/run/t8104.check new file mode 100644 index 0000000000..c2593eb199 --- /dev/null +++ b/test/files/run/t8104.check @@ -0,0 +1 @@ +TypeTag[(Int, Int)] diff --git a/test/files/run/t8104/Macros_1.scala b/test/files/run/t8104/Macros_1.scala new file mode 100644 index 0000000000..21d81a3687 --- /dev/null +++ b/test/files/run/t8104/Macros_1.scala @@ -0,0 +1,11 @@ +import scala.reflect.macros.WhiteboxContext + +object Macros { + def impl[T](c: WhiteboxContext)(implicit T: c.WeakTypeTag[T]) = { + import c.universe._ + import definitions._ + val fields = T.tpe.declarations.toList.collect{ case x: TermSymbol if x.isVal && x.isCaseAccessor => x } + val Repr = appliedType(TupleClass(fields.length).asType.toType, fields.map(_.typeSignature)) + q"new Generic[$T]{ type Repr = $Repr }" + } +}
\ No newline at end of file diff --git a/test/files/run/t8104/Test_2.scala b/test/files/run/t8104/Test_2.scala new file mode 100644 index 0000000000..630176f175 --- /dev/null +++ b/test/files/run/t8104/Test_2.scala @@ -0,0 +1,16 @@ +trait Generic[T] { type Repr } +object Generic { + type Aux[T, Repr0] = Generic[T] { type Repr = Repr0 } + import scala.language.experimental.macros + implicit def materializeGeneric[T, Repr]: Generic.Aux[T, Repr] = macro Macros.impl[T] +} + +object Test extends App { + case class C(x: Int, y: Int) + + import scala.reflect.runtime.universe._ + def reprify[T, Repr](x: T)(implicit generic: Generic.Aux[T, Repr], tag: TypeTag[Repr]) = println(tag) + reprify(C(40, 2)) + + implicitly[Generic.Aux[C, (Int, Int)]] +} |