- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/mutable_variable_unprop_assign.rs:4:11: 4:11
      let _1: i32;                         // in scope 0 at $DIR/mutable_variable_unprop_assign.rs:5:9: 5:10
      let mut _3: i32;                     // in scope 0 at $DIR/mutable_variable_unprop_assign.rs:7:11: 7:12
      scope 1 {
          debug a => _1;                   // in scope 1 at $DIR/mutable_variable_unprop_assign.rs:5:9: 5:10
          let mut _2: (i32, i32);          // in scope 1 at $DIR/mutable_variable_unprop_assign.rs:6:9: 6:14
          scope 2 {
              debug x => _2;               // in scope 2 at $DIR/mutable_variable_unprop_assign.rs:6:9: 6:14
              let _4: i32;                 // in scope 2 at $DIR/mutable_variable_unprop_assign.rs:8:9: 8:10
              scope 3 {
                  debug y => _4;           // in scope 3 at $DIR/mutable_variable_unprop_assign.rs:8:9: 8:10
                  let _5: i32;             // in scope 3 at $DIR/mutable_variable_unprop_assign.rs:9:9: 9:10
                  scope 4 {
                      debug z => _5;       // in scope 4 at $DIR/mutable_variable_unprop_assign.rs:9:9: 9:10
                  }
              }
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/mutable_variable_unprop_assign.rs:5:9: 5:10
          _1 = foo() -> bb1;               // scope 0 at $DIR/mutable_variable_unprop_assign.rs:5:13: 5:18
                                           // mir::Constant
                                           // + span: $DIR/mutable_variable_unprop_assign.rs:5:13: 5:16
                                           // + literal: Const { ty: fn() -> i32 {foo}, val: Value(Scalar(<ZST>)) }
      }
  
      bb1: {
          StorageLive(_2);                 // scope 1 at $DIR/mutable_variable_unprop_assign.rs:6:9: 6:14
          (_2.0: i32) = const 1_i32;       // scope 1 at $DIR/mutable_variable_unprop_assign.rs:6:29: 6:35
          (_2.1: i32) = const 2_i32;       // scope 1 at $DIR/mutable_variable_unprop_assign.rs:6:29: 6:35
          StorageLive(_3);                 // scope 2 at $DIR/mutable_variable_unprop_assign.rs:7:11: 7:12
          _3 = _1;                         // scope 2 at $DIR/mutable_variable_unprop_assign.rs:7:11: 7:12
          (_2.1: i32) = move _3;           // scope 2 at $DIR/mutable_variable_unprop_assign.rs:7:5: 7:12
          StorageDead(_3);                 // scope 2 at $DIR/mutable_variable_unprop_assign.rs:7:11: 7:12
          StorageLive(_4);                 // scope 2 at $DIR/mutable_variable_unprop_assign.rs:8:9: 8:10
          _4 = (_2.1: i32);                // scope 2 at $DIR/mutable_variable_unprop_assign.rs:8:13: 8:16
          StorageLive(_5);                 // scope 3 at $DIR/mutable_variable_unprop_assign.rs:9:9: 9:10
          _5 = (_2.0: i32);                // scope 3 at $DIR/mutable_variable_unprop_assign.rs:9:13: 9:16
          nop;                             // scope 0 at $DIR/mutable_variable_unprop_assign.rs:4:11: 10:2
          StorageDead(_5);                 // scope 3 at $DIR/mutable_variable_unprop_assign.rs:10:1: 10:2
          StorageDead(_4);                 // scope 2 at $DIR/mutable_variable_unprop_assign.rs:10:1: 10:2
          StorageDead(_2);                 // scope 1 at $DIR/mutable_variable_unprop_assign.rs:10:1: 10:2
          StorageDead(_1);                 // scope 0 at $DIR/mutable_variable_unprop_assign.rs:10:1: 10:2
          return;                          // scope 0 at $DIR/mutable_variable_unprop_assign.rs:10:2: 10:2
      }
  }