- // MIR for `foo` before CopyPropagation
+ // MIR for `foo` after CopyPropagation
  
  fn foo(_1: u8) -> () {
      debug x => _1;                       // in scope 0 at $DIR/copy_propagation_arg.rs:9:8: 9:13
      let mut _0: ();                      // return place in scope 0 at $DIR/copy_propagation_arg.rs:9:19: 9:19
      let mut _2: u8;                      // in scope 0 at $DIR/copy_propagation_arg.rs:11:9: 11:17
      let mut _3: u8;                      // in scope 0 at $DIR/copy_propagation_arg.rs:11:15: 11:16
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $DIR/copy_propagation_arg.rs:11:9: 11:17
          StorageLive(_3);                 // scope 0 at $DIR/copy_propagation_arg.rs:11:15: 11:16
          _3 = _1;                         // scope 0 at $DIR/copy_propagation_arg.rs:11:15: 11:16
          _2 = const dummy(move _3) -> bb1; // scope 0 at $DIR/copy_propagation_arg.rs:11:9: 11:17
                                           // ty::Const
                                           // + ty: fn(u8) -> u8 {dummy}
                                           // + val: Value(Scalar(<ZST>))
                                           // mir::Constant
                                           // + span: $DIR/copy_propagation_arg.rs:11:9: 11:14
                                           // + literal: Const { ty: fn(u8) -> u8 {dummy}, val: Value(Scalar(<ZST>)) }
      }
  
      bb1: {
          StorageDead(_3);                 // scope 0 at $DIR/copy_propagation_arg.rs:11:16: 11:17
          _1 = move _2;                    // scope 0 at $DIR/copy_propagation_arg.rs:11:5: 11:17
          StorageDead(_2);                 // scope 0 at $DIR/copy_propagation_arg.rs:11:16: 11:17
          _0 = const ();                   // scope 0 at $DIR/copy_propagation_arg.rs:9:19: 12:2
                                           // ty::Const
                                           // + ty: ()
                                           // + val: Value(Scalar(<ZST>))
                                           // mir::Constant
                                           // + span: $DIR/copy_propagation_arg.rs:9:19: 12:2
                                           // + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
          return;                          // scope 0 at $DIR/copy_propagation_arg.rs:12:2: 12:2
      }
  }