[libgee] Fix compilation with vala master

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit e25a061501fc224d6667e9ebdbe8a0e569a8b5ba
Author: Maciej Piechotka <uzytkownik2 gmail com>
Date:   Fri Jan 20 14:45:03 2012 +0000

    Fix compilation with vala master

 gee/abstractcollection.vala |   10 ++++++++++
 gee/concurrentlist.vala     |    2 +-
 tests/testarraylist.vala    |    4 ++++
 3 files changed, 15 insertions(+), 1 deletions(-)
---
diff --git a/gee/abstractcollection.vala b/gee/abstractcollection.vala
index b114be1..e130fac 100644
--- a/gee/abstractcollection.vala
+++ b/gee/abstractcollection.vala
@@ -187,8 +187,13 @@ public abstract class Gee.AbstractCollection<G> : Object, Traversable<G>, Iterab
 		return array;
 	}
 
+#if VALA_0_16
+	private static float?[] to_float_array(Collection<float?> coll) {
+		float?[] array = new float?[coll.size];
+#else
 	private static float[] to_float_array(Collection<float?> coll) {
 		float[] array = new float[coll.size];
+#endif
 		int index = 0;
 		foreach (float element in coll) {
 			array[index++] = element;
@@ -196,8 +201,13 @@ public abstract class Gee.AbstractCollection<G> : Object, Traversable<G>, Iterab
 		return array;
 	}
 
+#if VALA_0_16
+	private static double?[] to_double_array(Collection<double?> coll) {
+		double?[] array = new double?[coll.size];
+#else
 	private static double[] to_double_array(Collection<double?> coll) {
 		double[] array = new double[coll.size];
+#endif
 		int index = 0;
 		foreach (double element in coll) {
 			array[index++] = element;
diff --git a/gee/concurrentlist.vala b/gee/concurrentlist.vala
index e33deb1..e57c7ec 100644
--- a/gee/concurrentlist.vala
+++ b/gee/concurrentlist.vala
@@ -408,7 +408,7 @@ public class Gee.ConcurrentList<G> : AbstractList<G> {
 #endif
 		}
 
-		public static inline bool proceed<G> (ref Node<G> prev, ref Node<G> curr, bool force = false) {
+		public static inline bool proceed<G> (ref Node<G>? prev, ref Node<G> curr, bool force = false) {
 			Node<G> next = curr.get_next ();
 			while (next != null) {
 				State next_state = next.get_state ();
diff --git a/tests/testarraylist.vala b/tests/testarraylist.vala
index b13ec30..381740e 100644
--- a/tests/testarraylist.vala
+++ b/tests/testarraylist.vala
@@ -131,7 +131,11 @@ public class ArrayListTests : BidirListTests {
 		assert (double_list.add (1.5d));
 		assert (double_list.add (2.0d));
 
+#if VALA_0_16
+		double?[] double_array = double_list.to_array ();
+#else
 		double[] double_array = double_list.to_array ();
+#endif
 		index = 0;
 		foreach (double element in double_list) {
 			assert (element == double_array[index++]);