Explicitly convert Array to immutable.Seq

The collections library doesn't do this automatically.  Seemingly,
this is because org.scalacheck.util.SerializableCanBuildFroms has
implicits that interfere.

Author: ashawley

src/main/scala/org/scalacheck/Arbitrary.scala

@@ -372,7 +372,7 @@ private[scalacheck] sealed trait ArbitraryLowPriority {
 
   implicit def arbEnum[A <: java.lang.Enum[A]](implicit A: reflect.ClassTag[A]): Arbitrary[A] = {
     val values = A.runtimeClass.getEnumConstants.asInstanceOf[Array[A]]
-    Arbitrary(Gen.oneOf(values))
+    Arbitrary(Gen.oneOf(values.to[Vector]))
   }
 
   implicit def arbPartialFunction[A: Cogen, B: Arbitrary]: Arbitrary[PartialFunction[A, B]] =

src/main/scala/org/scalacheck/Gen.scala

@@ -531,7 +531,7 @@ object Gen extends GenArities{
     }
 
   /** Picks a random value from a list */
-  def oneOf[T](t0: T, t1: T, tn: T*): Gen[T] = oneOf(t0 +: t1 +: tn)
+  def oneOf[T](t0: T, t1: T, tn: T*): Gen[T] = oneOf((t0 +: t1 +: tn).to[Vector])
 
   /** Picks a random generator from a list */
   def oneOf[T](g0: Gen[T], g1: Gen[T], gn: Gen[T]*): Gen[T] = {
@@ -708,7 +708,7 @@ object Gen extends GenArities{
           seed = s
         }
       }
-      r(Some(buf), seed)
+      r(Some(buf.to[Vector]), seed)
     }
   }
 

src/main/scala/org/scalacheck/Properties.scala

@@ -12,6 +12,7 @@ package org.scalacheck
 import org.scalacheck.rng.Seed
 
 import language.reflectiveCalls
+import collection.immutable.Seq
 
 import util.ConsoleReporter
 
@@ -41,7 +42,7 @@ class Properties(val name: String) {
 
   /** Returns all properties of this collection in a list of name/property
    *  pairs.  */
-  def properties: collection.Seq[(String,Prop)] = props
+  def properties: Seq[(String,Prop)] = props.to[Seq]
 
   /** Convenience method that checks the properties with the given parameters
    *  (or default parameters, if not specified)