From bcf53cbe913a99bb243b5782da644cf0efecc598 Mon Sep 17 00:00:00 2001
From: Paul Phillips <paulp@improving.org>
Date: Sat, 29 Oct 2011 19:34:10 +0000
Subject: Test case closes SI-4957.

No review.
---
 test/files/pos/t4957.scala | 89 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 test/files/pos/t4957.scala

diff --git a/test/files/pos/t4957.scala b/test/files/pos/t4957.scala
new file mode 100644
index 0000000000..7f037ee25d
--- /dev/null
+++ b/test/files/pos/t4957.scala
@@ -0,0 +1,89 @@
+// a.scala
+// Sat Oct 29 10:06:51 PDT 2011
+
+package simple
+
+import scala.{Double=>double, Int=>int}
+
+/**
+ * @author Christoph Radig
+ */
+
+trait Vector {
+
+        def xd: double
+        def yd: double
+}
+
+object Vector {
+
+        def apply(x: double, y: double) = Double(x, y)
+        def apply(x: int, y: int) = Int(x, y)
+
+        trait Companion[@specialized(double, int) T] {
+
+                type I <: Instance[T]
+
+                def apply(x: T, y: T): I  // I (= this.type#I) or this.I?
+
+                lazy val zero: I = apply(numeric.zero, numeric.zero)
+
+                val numeric: Numeric[T]
+        }
+
+        trait Instance[@specialized(double, int) T] extends Vector {
+
+                type C <: Companion[T]
+                def companion: C
+
+                def numeric: Numeric[T] = companion.numeric
+
+                val x: T
+                val y: T
+
+                def xd = numeric.toDouble(x)
+                def yd = numeric.toDouble(y)
+
+                def + (that: C#I): C#I = companion(numeric.plus(this.x, that.x), numeric.plus(this.y, that.y))
+                def - (that: C#I): C#I = companion(numeric.minus(this.x, that.x), numeric.minus(this.y, that.y))
+
+                /**
+                 * scalar multiplication
+                 */
+                def * (scalar: T): C#I = companion(numeric.times(this.x, scalar), numeric.times(this.y, scalar))
+        }
+
+        object Double extends Companion[double] {
+
+                type I = Double
+
+                def apply(x: double, y: double) = new Double(x, y)
+
+                val numeric = Numeric.DoubleIsFractional
+        }
+
+        final class Double(val x: double, val y: double) extends Instance[double] {
+
+                type C = Double.type
+                def companion = Double
+
+                @inline override def xd = x
+                @inline override def yd = y
+        }
+
+
+        object Int extends Companion[int] {
+
+                type I = Int
+
+                def apply(x: int, y: int) = new Int(x, y)
+
+                val numeric = Numeric.IntIsIntegral
+        }
+
+        final class Int(val x: int, val y: int) extends Instance[int] {
+
+                type C = Int.type
+                def companion = Int
+        }
+}
-- 
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