- // MIR for `arg_src` before DestinationPropagation
+ // MIR for `arg_src` after DestinationPropagation
  
  fn arg_src(_1: i32) -> i32 {
      debug x => _1;
      let mut _0: i32;
      let _2: i32;
      scope 1 {
-         debug y => _2;
+         debug y => _0;
      }
  
      bb0: {
-         StorageLive(_2);
-         _2 = copy _1;
+         nop;
+         _0 = copy _1;
          _1 = const 123_i32;
-         _0 = copy _2;
-         StorageDead(_2);
+         nop;
+         nop;
          return;
      }
  }