1 files changed, 108 insertions, 0 deletions
diff --git a/tests/untried/neg-with-implicits/macro-bundle-whitebox-use-raw/Macros_1.scala b/tests/untried/neg-with-implicits/macro-bundle-whitebox-use-raw/Macros_1.scala
new file mode 100644
index 000000000..61bf73e48
--- /dev/null
+++ b/tests/untried/neg-with-implicits/macro-bundle-whitebox-use-raw/Macros_1.scala
@@ -0,0 +1,108 @@
+import scala.reflect.macros.blackbox.Context
+import scala.language.experimental.macros
+
+// whitebox use case #1: return type refinement
+
+class ReturnTypeRefinementBundle(val c: Context) {
+  import c.universe._
+  def impl = {
+    q"""
+      trait Foo {
+        def x = 2
+      }
+      new Foo {}
+    """
+  }
+}
+
+object ReturnTypeRefinement {
+  def foo: Any = macro ReturnTypeRefinementBundle.impl
+}
+
+// whitebox use case #2: fundep materialization
+
+trait FundepMaterialization[T, U] {
+  def to(t : T) : U
+  // def from(u : U) : T
+}
+
+class FundepMaterializationBundle(val c: Context) {
+  import c.universe._
+  import definitions._
+  import Flag._
+
+  def impl[T: c.WeakTypeTag, U: c.WeakTypeTag]: c.Expr[FundepMaterialization[T, U]] = {
+    val sym = c.weakTypeOf[T].typeSymbol
+    if (!sym.isClass || !sym.asClass.isCaseClass) c.abort(c.enclosingPosition, s"$sym is not a case class")
+    val fields = sym.info.decls.toList.collect{ case x: TermSymbol if x.isVal && x.isCaseAccessor => x }
+
+    def mkTpt() = {
+      val core = Ident(TupleClass(fields.length) orElse UnitClass)
+      if (fields.length == 0) core
+      else AppliedTypeTree(core, fields map (f => TypeTree(f.info)))
+    }
+
+    def mkFrom() = {
+      if (fields.length == 0) Literal(Constant(Unit))
+      else Apply(Ident(newTermName("Tuple" + fields.length)), fields map (f => Select(Ident(newTermName("f")), newTermName(f.name.toString.trim))))
+    }
+
+    val evidenceClass = ClassDef(Modifiers(FINAL), newTypeName("$anon"), List(), Template(
+      List(AppliedTypeTree(Ident(newTypeName("FundepMaterialization")), List(Ident(sym), mkTpt()))),
+      emptyValDef,
+      List(
+        DefDef(Modifiers(), termNames.CONSTRUCTOR, List(), List(List()), TypeTree(), Block(List(Apply(Select(Super(This(typeNames.EMPTY), typeNames.EMPTY), termNames.CONSTRUCTOR), List())), Literal(Constant(())))),
+        DefDef(Modifiers(), newTermName("to"), List(), List(List(ValDef(Modifiers(PARAM), newTermName("f"), Ident(sym), EmptyTree))), TypeTree(), mkFrom()))))
+    c.Expr[FundepMaterialization[T, U]](Block(List(evidenceClass), Apply(Select(New(Ident(newTypeName("$anon"))), termNames.CONSTRUCTOR), List())))
+  }
+}
+
+object FundepMaterialization {
+  implicit def materializeIso[T, U]: FundepMaterialization[T, U] = macro FundepMaterializationBundle.impl[T, U]
+}
+
+// whitebox use case #3: dynamic materialization
+
+trait DynamicMaterialization[T]
+
+class C1(val x: Int)
+class C2(val x: String)
+
+trait LowPriority {
+  implicit def lessSpecific[T]: DynamicMaterialization[T] = null
+}
+
+object DynamicMaterialization extends LowPriority {
+  implicit def moreSpecific[T]: DynamicMaterialization[T] = macro DynamicMaterializationBundle.impl[T]
+}
+
+class DynamicMaterializationBundle(val c: Context) {
+  import c.universe._
+  def impl[T: c.WeakTypeTag] = {
+    val tpe = weakTypeOf[T]
+    if (tpe.members.exists(_.info =:= typeOf[Int]))
+      c.abort(c.enclosingPosition, "I don't like classes that contain integers")
+    q"new DynamicMaterialization[$tpe]{ override def toString = ${tpe.toString} }"
+  }
+}
+
+// whitebox use case #4: extractor macros
+
+object ExtractorMacro {
+  def unapply(x: Int): Any = macro ExtractorBundle.unapplyImpl
+}
+
+class ExtractorBundle(val c: Context) {
+  import c.universe._
+  def unapplyImpl(x: Tree) = {
+    q"""
+      new {
+        class Match(x: Int) {
+          def isEmpty = false
+          def get = x
+        }
+        def unapply(x: Int) = new Match(x)
+      }.unapply($x)
+    """
+  }
+}