1 files changed, 40 insertions, 0 deletions
diff --git a/test/files/run/macro-expand-tparams-prefix/Impls_1.scala b/test/files/run/macro-expand-tparams-prefix/Impls_1.scala
new file mode 100644
index 0000000000..e92396d1b4
--- /dev/null
+++ b/test/files/run/macro-expand-tparams-prefix/Impls_1.scala
@@ -0,0 +1,40 @@
+import scala.reflect.runtime.universe._
+import scala.reflect.macros.Context
+
+object Impls1 {
+  def foo[U: c.WeakTypeTag](c: Context)(x: c.Expr[U]) = {
+    import c.universe._
+    val U = implicitly[c.WeakTypeTag[U]]
+    val body = Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(Literal(Constant(U.toString))))
+    c.Expr[Unit](body)
+  }
+}
+
+object Impls2 {
+  def foo[T: c.WeakTypeTag, U: c.WeakTypeTag](c: Context)(x: c.Expr[U]) = {
+    import c.universe._
+    val T = implicitly[c.WeakTypeTag[T]]
+    val U = implicitly[c.WeakTypeTag[U]]
+    val body = Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(Literal(Constant(T.toString + " " + U.toString))))
+    c.Expr[Unit](body)
+  }
+}
+
+object Impls345 {
+  def foo[T, U: c.WeakTypeTag, V](c: Context)(implicit T: c.WeakTypeTag[T], V: c.WeakTypeTag[V]): c.Expr[Unit] = {
+    import c.universe._
+    c.Expr(Block(List(
+      Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(Literal(Constant(T.toString)))),
+      Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(Literal(Constant(implicitly[c.WeakTypeTag[U]].toString)))),
+      Apply(Select(Ident(definitions.PredefModule), TermName("println")), List(Literal(Constant(V.toString))))),
+      Literal(Constant(()))))
+  }
+}
+
+object Macros4 {
+  class D[T] {
+    class C[U] {
+      def foo[V] = macro Impls345.foo[T, U, V]
+    }
+  }
+}