Next we plan to support other bluitins through eam and-or-tree controls. Example: var(X) must be transformed into wait_till_bound(X), var(X) that will fail if X is bound or waits till is leftmost in the and-or-tree before continuning... git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1588 b08c6af1-5177-4d33-ba66-4b1c6b8b522a