relaxes attachment-matching rules

It came as a surprise recently, but attachments.contains/get/update/remove
require the class of the payload to match the provided tag exactly, not
taking subclassing into account. This commit fixes the oversight.

2 files changed, 22 insertions, 0 deletions

diff --git a/test/files/pos/macro-attachments/Macros_1.scala b/test/files/pos/macro-attachments/Macros_1.scala
new file mode 100644
index 0000000000..38d05d5b85
--- /dev/null
+++ b/test/files/pos/macro-attachments/Macros_1.scala
@@ -0,0 +1,19 @@
+import scala.language.experimental.macros
+import scala.reflect.macros.whitebox.Context
+
+trait Base
+class Att extends Base
+
+object Macros {
+  def impl(c: Context) = {
+    import c.universe._
+    import c.internal._
+    import decorators._
+    val dummy = q"x"
+    dummy.updateAttachment(new Att)
+    if (dummy.attachments.get[Base].isEmpty) c.abort(c.enclosingPosition, "that's not good")
+    q"()"
+  }
+
+  def foo: Any = macro impl
+}
\ No newline at end of file
diff --git a/test/files/pos/macro-attachments/Test_2.scala b/test/files/pos/macro-attachments/Test_2.scala
new file mode 100644
index 0000000000..acfddae942
--- /dev/null
+++ b/test/files/pos/macro-attachments/Test_2.scala
@@ -0,0 +1,3 @@
+object Test extends App {
+  Macros.foo
+}
\ No newline at end of file