SI-5235 Correct usecase variable expansion

The bug is related to a couple of other annoyances, also fixed:
 - usecases without type params were crashing scaladoc due to a change
in the PolyTypes class (not allowing empty tparams list)
 - properly getting rid of backticks (even if the link is not valid)
 - correct linking for usecases with $Coll = `immutable.Seq`
(the symbol searching algorithm was too of restrictive, now we search
the entire ownerchain - and the empty package at the end)
 - give a warning if the type lookup fails
 - finally, added a $Coll variable to List, for some reason it wasn't
there and we were getting immutable.Seq as the result of use cases.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/partest/scala/tools/partest/ScaladocModelTest.scala b/src/partest/scala/tools/partest/ScaladocModelTest.scala
index de5354d4a0..be70a91e14 100644
--- a/src/partest/scala/tools/partest/ScaladocModelTest.scala
+++ b/src/partest/scala/tools/partest/ScaladocModelTest.scala
@@ -12,6 +12,7 @@ import scala.tools.nsc.util.CommandLineParser
 import scala.tools.nsc.doc.{Settings, DocFactory, Universe}
 import scala.tools.nsc.doc.model._
 import scala.tools.nsc.reporters.ConsoleReporter
+import scala.tools.nsc.doc.model.comment.Comment
 
 /** A class for testing scaladoc model generation
  *   - you need to specify the code in the `code` method
@@ -142,5 +143,14 @@ abstract class ScaladocModelTest extends DirectTest {
       case _ => sys.error("Error getting " + expl + ": " + list.length + " elements with this name. " +
                   "All elements in list: [" + list.mkString(", ") + "]")
     }
+
+    def extractCommentText(c: Comment) = {
+      def extractText(body: Any): String = body match {
+        case s: String  => s
+        case p: Product => p.productIterator.toList.map(extractText(_)).mkString
+        case _          => ""
+      }
+      extractText(c.body)
+    }
   }
 }