MmapPool: (p[] is null) != (p[].ptr is null)

source/tanya/memory/mmappool.d

@@ -156,7 +156,7 @@ final class MmapPool : Allocator
 	 */
 	bool deallocate(void[] p) shared nothrow @nogc
 	{
-		if (p is null)
+		if (p.ptr is null)
 		{
 			return true;
 		}

source/tanya/memory/package.d

@@ -220,15 +220,26 @@ void dispose(T)(shared Allocator allocator, auto ref T p)
 }
 
 /// Ditto.
-void dispose(T)(shared Allocator allocator, auto ref T[] array)
+void dispose(T)(shared Allocator allocator, auto ref T[] p)
 {
-	static if (hasElaborateDestructor!(typeof(array[0])))
+	static if (hasElaborateDestructor!(typeof(p[0])))
 	{
-	foreach (ref e; array)
-	{
-	    destroy(e);
+		import std.algorithm.iteration;
+		p.each!(e => destroy(e));
 	}
-	}
-	() @trusted { allocator.deallocate(array); }();
-	array = null;
+	() @trusted { allocator.deallocate(p); }();
+	p = null;
+}
+
+unittest
+{
+	struct S
+	{
+		~this()
+		{
+		}
+	}
+	auto p = cast(S[]) defaultAllocator.allocate(S.sizeof);
+
+	defaultAllocator.dispose(p);
 }