Promises are now refs

todo.txt

@@ -1,6 +1,20 @@
 version 0.9.6
 =============
 
+Concurrency
+-----------
+
+- document the new 'spawn' and 'parallel' statements
+- implement 'deepCopy' builtin
+- implement 'foo[1..4] = spawn(f[4..7])'
+- the disjoint checker needs to deal with 'a = spawn f(); g = spawn f()'
+- Minor: The copying of the 'ref Promise' into the thead local storage only
+  happens to work due to the write barrier's implementation
+
+
+Misc
+----
+
 - fix the bug that keeps 'defer' template from working
 - make '--implicitStatic:on' the default
 - fix the tuple unpacking in lambda bug