2 files changed, 45 insertions, 0 deletions
diff --git a/test/files/neg/bug591.check b/test/files/neg/bug591.check
new file mode 100644
index 0000000000..9d1a090053
--- /dev/null
+++ b/test/files/neg/bug591.check
@@ -0,0 +1,4 @@
+bug591.scala:38 error: method input_= is defined twice
+    def input_=(in : Input) = {}
+    ^
+one error found
diff --git a/test/files/neg/bug591.scala b/test/files/neg/bug591.scala
new file mode 100644
index 0000000000..94d8068bb3
--- /dev/null
+++ b/test/files/neg/bug591.scala
@@ -0,0 +1,41 @@
+abstract class BaseList {
+  type Node <: BaseNode;
+
+
+  abstract class BaseNode {
+    protected def self : Node;
+    private[BaseList] def self00 = self;
+    def dirty : Unit = {}
+    def replaceWith(node : Node) = {}
+  }
+
+  implicit def baseNode2Node(bnode : BaseNode): Node = bnode.self00;
+
+
+}
+
+
+trait BaseFlow extends BaseList {
+  type Node <: BFNode;
+  type Flow <: FlowBase;
+  type Output <: OutputBase;
+  type  Input <:  InputBase;
+
+  abstract class FlowBase {
+
+  }
+  trait OutputBase extends FlowBase {
+
+  }
+  trait  InputBase extends FlowBase {
+
+  }
+
+  trait BFNode extends BaseNode {
+    private var  input : Input  = null;
+    private var output : Output = null;
+
+    def input_=(in : Input) = {}
+
+  }
+}