HIDDEN => ARTIFACT

This test is necessary in the API to tell apart useful synthetic symbols
(such as accessors) and low-level compilation artifacts (such as $outer).

However `isHidden` (as it's currently named in the compiler) is too generic.
Hence I renamed it along with the corresponding flag. Now the test says
`isArtifact` and the flag is named ARTIFACT.

Despite being an improvement over the first version, `isArtifact` is
still a bit unlucky. The name I like is `isImplementationArtifact`, but that's
a mouthful to be used in compiler hacking. Moreover, IMPLEMENTATION_ARTIFACT
looks weird.

For a discussion about related stuff see:
http://groups.google.com/group/scala-internals/browse_thread/thread/d04e762127737968
https://github.com/scala/scala/pull/1114

1 files changed, 5 insertions, 0 deletions

diff --git a/src/reflect/scala/reflect/api/Symbols.scala b/src/reflect/scala/reflect/api/Symbols.scala
index 448382973a..9846d827b7 100644
--- a/src/reflect/scala/reflect/api/Symbols.scala
+++ b/src/reflect/scala/reflect/api/Symbols.scala
@@ -67,6 +67,11 @@ trait Symbols extends base.Symbols { self: Universe =>
      */
     def isSynthetic: Boolean
 
+    /** Does this symbol represent an implementation artifact that isn't meant for public use?
+     *  Examples of such artifacts are erasure bridges and $outer fields.
+     */
+    def isImplementationArtifact: Boolean
+
     /** Does this symbol represent a local declaration or definition?
      *
      *  If yes, either `isPrivate` or `isProtected` are guaranteed to be true.