Added new test, see #2754

1 files changed, 39 insertions, 0 deletions

diff --git a/test/files/run/t2754.scala b/test/files/run/t2754.scala
new file mode 100644
index 0000000000..14c4f31e59
--- /dev/null
+++ b/test/files/run/t2754.scala
@@ -0,0 +1,39 @@
+object Main {
+    def main(args: Array[String]) {
+        val v: FooBarPlus[Int] = new FooBarPlusImpl()
+        v.foo += 10
+    }
+}
+
+trait Foo[P] {
+    def foo: P
+}
+
+trait FooBar[P] extends Foo[P] {
+    def bar: P
+}
+
+trait FooBarPlus[P] extends FooBar[P] {
+    override def foo: P
+    override def bar: P
+
+    def foo_=(x: P)
+    def bar_=(x: P)
+}
+
+class FooImpl extends Foo[Int] {
+    def foo = 1
+}
+
+class FooBarImpl extends FooImpl with FooBar[Int] {
+    protected var f = 0
+    protected var b = 0
+
+    override def foo = f
+    def bar = b
+}
+
+class FooBarPlusImpl extends FooBarImpl with FooBarPlus[Int] {
+    def foo_=(x: Int) { f = x }
+    def bar_=(x: Int) { b = x }
+}