fix warning

Author: nikomatsakis

src/rustc/middle/trans/base.rs

@@ -3856,8 +3856,7 @@ fn trans_break_cont(bcx: block, to_end: bool)
     let _icx = bcx.insn_ctxt("trans_break_cont");
     // Locate closest loop block, outputting cleanup as we go.
     let mut unwind = bcx;
-    let mut target = bcx; // FIXME---not necc. but tstate thinks it is
-    let _target = target; // FIXME---hack to shut up liveness about target
+    let mut target;
     loop {
         alt unwind.kind {
           block_scope({loop_break: some(brk), _}) {