SI-5923 instantiates targs in deferred macro applications

In January I submitted a pull request that, as I thought back then,
fixes SI-5923: https://github.com/scala/scala/commit/fe60284769.
The pull request was merged, and everyone was happy that the bug got fixed.

Unfortunately, the fix was: a) incomplete, b) broke something else,
as noticed by Miles in https://groups.google.com/d/topic/scala-internals/7pA9CiiD3u8/discussion.

Now we got a real fix in 2.10.x (https://github.com/scala/scala/commit/90ac5c4e13),
and it's my pleasure to port it to master.

2 files changed, 19 insertions, 0 deletions

diff --git a/test/files/run/t5923a/Macros_1.scala b/test/files/run/t5923a/Macros_1.scala
new file mode 100644
index 0000000000..6d21362c4d
--- /dev/null
+++ b/test/files/run/t5923a/Macros_1.scala
@@ -0,0 +1,14 @@
+import scala.reflect.macros.Context
+import language.experimental.macros
+
+case class C[T](t: String)
+object C {
+  implicit def foo[T]: C[T] = macro Macros.impl[T]
+}
+
+object Macros {
+  def impl[T: c.WeakTypeTag](c: Context) = {
+    import c.universe._
+    reify(C[T](c.literal(weakTypeOf[T].toString).splice))
+  }
+}
\ No newline at end of file
diff --git a/test/files/run/t5923a/Test_2.scala b/test/files/run/t5923a/Test_2.scala
new file mode 100644
index 0000000000..001ff9aea8
--- /dev/null
+++ b/test/files/run/t5923a/Test_2.scala
@@ -0,0 +1,5 @@
+object Test extends App {
+  println(implicitly[C[Int]])
+  println(implicitly[C[String]])
+  println(implicitly[C[Nothing]])
+}
\ No newline at end of file