- // MIR for `main` before SimplifyArmIdentity
+ // MIR for `main` after SimplifyArmIdentity
  
  fn main() -> () {
      let mut _0: ();                      // return place in scope 0 at $DIR/simplify-arm-identity.rs:17:11: 17:11
      let _1: Src;                         // in scope 0 at $DIR/simplify-arm-identity.rs:18:9: 18:10
      let mut _2: Dst;                     // in scope 0 at $DIR/simplify-arm-identity.rs:19:18: 22:6
      let mut _3: isize;                   // in scope 0 at $DIR/simplify-arm-identity.rs:20:9: 20:20
      let mut _5: u8;                      // in scope 0 at $DIR/simplify-arm-identity.rs:20:33: 20:34
      scope 1 {
          debug e => _1;                   // in scope 1 at $DIR/simplify-arm-identity.rs:18:9: 18:10
          let _4: u8;                      // in scope 1 at $DIR/simplify-arm-identity.rs:20:18: 20:19
          scope 2 {
          }
          scope 3 {
              debug x => _4;               // in scope 3 at $DIR/simplify-arm-identity.rs:20:18: 20:19
          }
      }
  
      bb0: {
          StorageLive(_1);                 // scope 0 at $DIR/simplify-arm-identity.rs:18:9: 18:10
          ((_1 as Foo).0: u8) = const 0_u8; // scope 0 at $DIR/simplify-arm-identity.rs:18:18: 18:29
          discriminant(_1) = 0;            // scope 0 at $DIR/simplify-arm-identity.rs:18:18: 18:29
          StorageLive(_2);                 // scope 1 at $DIR/simplify-arm-identity.rs:19:18: 22:6
          _3 = const 0_isize;              // scope 1 at $DIR/simplify-arm-identity.rs:20:9: 20:20
          goto -> bb3;                     // scope 1 at $DIR/simplify-arm-identity.rs:20:9: 20:20
      }
  
      bb1: {
          ((_2 as Foo).0: u8) = const 0_u8; // scope 1 at $DIR/simplify-arm-identity.rs:21:21: 21:32
          discriminant(_2) = 0;            // scope 1 at $DIR/simplify-arm-identity.rs:21:21: 21:32
          goto -> bb4;                     // scope 1 at $DIR/simplify-arm-identity.rs:19:18: 22:6
      }
  
      bb2: {
          unreachable;                     // scope 1 at $DIR/simplify-arm-identity.rs:19:24: 19:25
      }
  
      bb3: {
          StorageLive(_4);                 // scope 1 at $DIR/simplify-arm-identity.rs:20:18: 20:19
          _4 = ((_1 as Foo).0: u8);        // scope 1 at $DIR/simplify-arm-identity.rs:20:18: 20:19
          StorageLive(_5);                 // scope 3 at $DIR/simplify-arm-identity.rs:20:33: 20:34
          _5 = _4;                         // scope 3 at $DIR/simplify-arm-identity.rs:20:33: 20:34
          ((_2 as Foo).0: u8) = move _5;   // scope 3 at $DIR/simplify-arm-identity.rs:20:24: 20:35
          discriminant(_2) = 0;            // scope 3 at $DIR/simplify-arm-identity.rs:20:24: 20:35
          StorageDead(_5);                 // scope 3 at $DIR/simplify-arm-identity.rs:20:34: 20:35
          StorageDead(_4);                 // scope 1 at $DIR/simplify-arm-identity.rs:20:34: 20:35
          goto -> bb4;                     // scope 1 at $DIR/simplify-arm-identity.rs:19:18: 22:6
      }
  
      bb4: {
          StorageDead(_2);                 // scope 1 at $DIR/simplify-arm-identity.rs:22:6: 22:7
          nop;                             // scope 0 at $DIR/simplify-arm-identity.rs:17:11: 23:2
          StorageDead(_1);                 // scope 0 at $DIR/simplify-arm-identity.rs:23:1: 23:2
          return;                          // scope 0 at $DIR/simplify-arm-identity.rs:23:2: 23:2
      }
  }