--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/run/mini/aa4.d	Mon Jan 10 19:47:18 2011 +0100
@@ -0,0 +1,20 @@
+module aa4;
+
+void main()
+{
+    int[int] aa;
+    aa = addkey(aa,42,12);
+    int* p = haskey(aa,42);
+    assert(p && *p == 12);
+}
+
+int[int] addkey(int[int] aa, int key, int val)
+{
+    aa[key] = val;
+    return aa;
+}
+
+int* haskey(int[int] aa, int key)
+{
+    return key in aa;
+}