- // MIR for `main` before DestinationPropagation
+ // MIR for `main` after DestinationPropagation
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/union.rs:8:11: 8:11
      let _1: main::Un;                    // in scope 0 at $DIR/union.rs:13:9: 13:11
      let mut _2: u32;                     // in scope 0 at $DIR/union.rs:13:23: 13:28
      let _3: ();                          // in scope 0 at $DIR/union.rs:15:5: 15:27
      let mut _4: u32;                     // in scope 0 at $DIR/union.rs:15:10: 15:26
      scope 1 {
          debug un => _1;                  // in scope 1 at $DIR/union.rs:13:9: 13:11
          scope 2 {
          }
          scope 3 (inlined std::mem::drop::<u32>) { // at $DIR/union.rs:15:5: 15:27
              debug _x => _4;              // in scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL
          }
      }
  
      bb0: {
-         StorageLive(_1);                 // scope 0 at $DIR/union.rs:13:9: 13:11
-         StorageLive(_2);                 // scope 0 at $DIR/union.rs:13:23: 13:28
-         _2 = val() -> bb1;               // scope 0 at $DIR/union.rs:13:23: 13:28
+         nop;                             // scope 0 at $DIR/union.rs:13:9: 13:11
+         nop;                             // scope 0 at $DIR/union.rs:13:23: 13:28
+         (_1.0: u32) = val() -> bb1;      // scope 0 at $DIR/union.rs:13:23: 13:28
                                           // mir::Constant
                                           // + span: $DIR/union.rs:13:23: 13:26
                                           // + literal: Const { ty: fn() -> u32 {val}, val: Value(Scalar(<ZST>)) }
      }
  
      bb1: {
-         (_1.0: u32) = move _2;           // scope 0 at $DIR/union.rs:13:14: 13:30
-         StorageDead(_2);                 // scope 0 at $DIR/union.rs:13:29: 13:30
+         nop;                             // scope 0 at $DIR/union.rs:13:14: 13:30
+         nop;                             // scope 0 at $DIR/union.rs:13:29: 13:30
          StorageLive(_3);                 // scope 1 at $DIR/union.rs:15:5: 15:27
          StorageLive(_4);                 // scope 1 at $DIR/union.rs:15:10: 15:26
          _4 = (_1.0: u32);                // scope 2 at $DIR/union.rs:15:19: 15:24
          StorageDead(_4);                 // scope 1 at $DIR/union.rs:15:26: 15:27
          StorageDead(_3);                 // scope 1 at $DIR/union.rs:15:27: 15:28
-         StorageDead(_1);                 // scope 0 at $DIR/union.rs:16:1: 16:2
+         nop;                             // scope 0 at $DIR/union.rs:16:1: 16:2
          return;                          // scope 0 at $DIR/union.rs:16:2: 16:2
      }
  }