Fixes SI-5629.

Adds an additional argument to the unify method in
specialization - `tparams`. When this parameter is set
to `true`, unification is done over type parameters in
poly types as well.

Additionally, the unification in specialization now
works over type bounds.

This ensures that in the below example:

trait Foo[@specialized(Int) A] {
  def bar[B <: A](b: B) {}
}

class IntFoo extends Foo[Int] {
  override def bar[B <: Int](b: B) {}
}

the method `bar` gets correctly determined
as a method that needs a special override
for its `bar$mcI$sp`.

1 files changed, 41 insertions, 0 deletions

diff --git a/test/files/run/t5629b.scala b/test/files/run/t5629b.scala
new file mode 100644
index 0000000000..6c908081b9
--- /dev/null
+++ b/test/files/run/t5629b.scala
@@ -0,0 +1,41 @@
+
+
+
+
+
+object Test extends App {
+  
+  trait MyPF[@specialized(Int) -A] extends (A => Unit) {
+    def isDefinedAt(x: A): Boolean
+    def applyOrElse[A1 <: A](x: A1, default: A1 => Unit): Unit = {
+      println("MyPF.applyOrElse entered...")
+      if (isDefinedAt(x)) apply(x) else default(x)
+    }
+  }
+  
+  trait MySmartPF[@specialized(Int) -A] extends MyPF[A] {
+    def apply(x: A): Unit = {
+      println("MySmartPF.apply entered...")
+      applyOrElse(x, { _: Any => throw new MatchError })
+    }
+  }
+  
+  type T = Int
+  //type T = Any
+  
+  def newPF(test: T): MyPF[T] = new MySmartPF[T] {
+    def isDefinedAt(x: T): Boolean = x != test
+    override def applyOrElse[A1 <: T](x: A1, default: A1 => Unit): Unit = {
+      println("newPF.applyOrElse entered...")
+      if (x != test) { println("ok"); () } else { println("default"); default(x) } 
+    }
+  }
+  
+  val pf = newPF(1)
+  println("=== pf(1):")
+  try { pf(1) } catch { case x => println(x) }
+  println("=== pf(42):")
+  pf(42)
+  println("=== done")
+  
+}