Improved @tailrec error messages to specify the...

Improved @tailrec error messages to specify the reason. In the process
fixed old bug involving tail call transformation. Closes #3275, #2018.
Review by dragos.

1 files changed, 15 insertions, 0 deletions

diff --git a/test/files/pos/bug2018.scala b/test/files/pos/bug2018.scala
new file mode 100644
index 0000000000..1736c394c9
--- /dev/null
+++ b/test/files/pos/bug2018.scala
@@ -0,0 +1,15 @@
+class A {
+  val b = new B
+
+  def getChildren = List(new A).iterator
+
+  class B {
+    private def check = true
+
+    private def getAncestor(p: A): A = {
+      val c = (p.getChildren.find(_.b.check)) match {case Some(d) => d case None => p}
+
+      if (c == p) p else c.b.getAncestor(c)
+    }
+  }
+}
\ No newline at end of file