fxied bug788

changed collection library to use type patterns

1 files changed, 20 insertions, 0 deletions

diff --git a/test/files/pos/bug788.scala b/test/files/pos/bug788.scala
new file mode 100644
index 0000000000..23ffa4a52d
--- /dev/null
+++ b/test/files/pos/bug788.scala
@@ -0,0 +1,20 @@
+package test;
+
+trait Test {
+  type Node <: NodeImpl;
+  trait NodeImpl;
+  type Expression <: Node with ExpressionImpl;
+  trait ExpressionImpl extends NodeImpl {
+    def self : Expression;
+  }
+  type Named <: Node with NamedImpl;
+  trait NamedImpl extends NodeImpl {
+    def self : Named;
+  }
+  def asExpression(e : ExpressionImpl) : Named = {
+    e match {
+    case f : NamedImpl => f.self;
+    case _ => null;
+    }
+  }
+}