new liveness pass to supercede last_use / initedness

src/test/compile-fail/tstate-block-uninit.rs

@@ -0,0 +1,11 @@
+pure fn is_even(i: int) -> bool { (i%2) == 0 }
+fn even(i: int) : is_even(i) -> int { i }
+
+fn force(f: fn()) { f(); }
+
+fn main() {
+    let x: int = 4;
+    force(fn&() {
+        even(x); //! ERROR unsatisfied precondition
+    });
+}