wontcompile.java

interface Block { 
  R execute() throws X; 
}

public R time(String opName, Block block) throws X { 
     long startTime = System.nanoTime(); 
     boolean success = true; 
     try { 
       return block.execute(); 
     } catch (final Throwable ex) { 
       success = false; 
       throw ex; 
     } finally { 
       recordTiming( 
         "opName", System.nanoTime() - startTime, success ); 
     } 
}