Sequence->Seq

1 files changed, 30 insertions, 0 deletions

diff --git a/test/pending/pos/t1756.scala b/test/pending/pos/t1756.scala
new file mode 100644
index 0000000000..c22d5509e1
--- /dev/null
+++ b/test/pending/pos/t1756.scala
@@ -0,0 +1,30 @@
+trait Ring[T <: Ring[T]] {
+  def +(that: T): T
+  def *(that: T): T
+}
+
+class A extends Ring[A] {
+  def +(that: A) = new A
+  def *(that: A) = new A
+}
+
+class Poly[C <: Ring[C]](val c: C) extends Ring[Poly[C]] {
+  def +(that: Poly[C]) = new Poly(this.c+that.c)
+  def *(that: Poly[C]) = new Poly(this.c*that.c)
+}
+
+implicit def coef2poly[C <: Ring[C]](c: C) = new Poly(c)
+
+val a = new A
+val x = new Poly(new A)
+
+x+a // works
+a+x // works
+
+val y = new Poly(new Poly(new A))
+
+x+y*x // works
+x*y+x // works
+y*x+x // works
+
+x+x*y