- // MIR for `foo` before CopyProp
+ // MIR for `foo` after CopyProp
  
  fn foo() -> i32 {
      let mut _0: i32;                     // return place in scope 0 at $DIR/branch.rs:+0:13: +0:16
      let _1: i32;                         // in scope 0 at $DIR/branch.rs:+1:9: +1:10
      let mut _3: bool;                    // in scope 0 at $DIR/branch.rs:+3:16: +3:22
      let _4: i32;                         // in scope 0 at $DIR/branch.rs:+6:9: +6:14
      scope 1 {
          debug x => _1;                   // in scope 1 at $DIR/branch.rs:+1:9: +1:10
          let _2: i32;                     // in scope 1 at $DIR/branch.rs:+3:9: +3:10
          scope 2 {
              debug y => _2;               // in scope 2 at $DIR/branch.rs:+3:9: +3:10
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/branch.rs:+1:9: +1:10
          _1 = val() -> bb1;               // scope 0 at $DIR/branch.rs:+1:13: +1:18
                                           // mir::Constant
                                           // + span: $DIR/branch.rs:13:13: 13:16
                                           // + literal: Const { ty: fn() -> i32 {val}, val: Value(<ZST>) }
      }
  
      bb1: {
          StorageLive(_2);                 // scope 1 at $DIR/branch.rs:+3:9: +3:10
          StorageLive(_3);                 // scope 1 at $DIR/branch.rs:+3:16: +3:22
          _3 = cond() -> bb2;              // scope 1 at $DIR/branch.rs:+3:16: +3:22
                                           // mir::Constant
                                           // + span: $DIR/branch.rs:15:16: 15:20
                                           // + literal: Const { ty: fn() -> bool {cond}, val: Value(<ZST>) }
      }
  
      bb2: {
          switchInt(move _3) -> [0: bb4, otherwise: bb3]; // scope 1 at $DIR/branch.rs:+3:16: +3:22
      }
  
      bb3: {
          _2 = _1;                         // scope 1 at $DIR/branch.rs:+4:9: +4:10
          goto -> bb6;                     // scope 1 at $DIR/branch.rs:+3:13: +8:6
      }
  
      bb4: {
          StorageLive(_4);                 // scope 1 at $DIR/branch.rs:+6:9: +6:14
          _4 = val() -> bb5;               // scope 1 at $DIR/branch.rs:+6:9: +6:14
                                           // mir::Constant
                                           // + span: $DIR/branch.rs:18:9: 18:12
                                           // + literal: Const { ty: fn() -> i32 {val}, val: Value(<ZST>) }
      }
  
      bb5: {
          StorageDead(_4);                 // scope 1 at $DIR/branch.rs:+6:14: +6:15
          _2 = _1;                         // scope 1 at $DIR/branch.rs:+7:9: +7:10
          goto -> bb6;                     // scope 1 at $DIR/branch.rs:+3:13: +8:6
      }
  
      bb6: {
          StorageDead(_3);                 // scope 1 at $DIR/branch.rs:+8:5: +8:6
          _0 = _2;                         // scope 2 at $DIR/branch.rs:+10:5: +10:6
          StorageDead(_2);                 // scope 1 at $DIR/branch.rs:+11:1: +11:2
          StorageDead(_1);                 // scope 0 at $DIR/branch.rs:+11:1: +11:2
          return;                          // scope 0 at $DIR/branch.rs:+11:2: +11:2
      }
  }