- // MIR for `too_complex` before ConstProp
+ // MIR for `too_complex` after ConstProp
  
  fn too_complex(_1: Result<i32, usize>) -> Option<i32> {
      debug x => _1;                       // in scope 0 at $DIR/separate_const_switch.rs:9:16: 9:17
      let mut _0: std::option::Option<i32>; // return place in scope 0 at $DIR/separate_const_switch.rs:9:42: 9:53
      let mut _2: std::ops::ControlFlow<usize, i32>; // in scope 0 at $DIR/separate_const_switch.rs:14:11: 19:6
      let mut _3: isize;                   // in scope 0 at $DIR/separate_const_switch.rs:16:13: 16:18
      let _4: i32;                         // in scope 0 at $DIR/separate_const_switch.rs:16:16: 16:17
      let mut _5: i32;                     // in scope 0 at $DIR/separate_const_switch.rs:16:44: 16:45
      let _6: usize;                       // in scope 0 at $DIR/separate_const_switch.rs:17:17: 17:18
      let mut _7: usize;                   // in scope 0 at $DIR/separate_const_switch.rs:17:42: 17:43
      let mut _8: isize;                   // in scope 0 at $DIR/separate_const_switch.rs:20:9: 20:33
      let _9: i32;                         // in scope 0 at $DIR/separate_const_switch.rs:20:31: 20:32
      let mut _10: i32;                    // in scope 0 at $DIR/separate_const_switch.rs:20:42: 20:43
      let _11: usize;                      // in scope 0 at $DIR/separate_const_switch.rs:21:28: 21:29
      scope 1 {
          debug v => _4;                   // in scope 1 at $DIR/separate_const_switch.rs:16:16: 16:17
      }
      scope 2 {
          debug r => _6;                   // in scope 2 at $DIR/separate_const_switch.rs:17:17: 17:18
      }
      scope 3 {
          debug v => _9;                   // in scope 3 at $DIR/separate_const_switch.rs:20:31: 20:32
      }
      scope 4 {
          debug r => _11;                  // in scope 4 at $DIR/separate_const_switch.rs:21:28: 21:29
      }
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $DIR/separate_const_switch.rs:14:11: 19:6
          _3 = discriminant(_1);           // scope 0 at $DIR/separate_const_switch.rs:15:15: 15:16
          switchInt(move _3) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/separate_const_switch.rs:15:9: 15:16
      }
  
      bb1: {
          StorageLive(_6);                 // scope 0 at $DIR/separate_const_switch.rs:17:17: 17:18
          _6 = ((_1 as Err).0: usize);     // scope 0 at $DIR/separate_const_switch.rs:17:17: 17:18
          StorageLive(_7);                 // scope 2 at $DIR/separate_const_switch.rs:17:42: 17:43
          _7 = _6;                         // scope 2 at $DIR/separate_const_switch.rs:17:42: 17:43
          Deinit(_2);                      // scope 2 at $DIR/separate_const_switch.rs:17:23: 17:44
          ((_2 as Break).0: usize) = move _7; // scope 2 at $DIR/separate_const_switch.rs:17:23: 17:44
          discriminant(_2) = 1;            // scope 2 at $DIR/separate_const_switch.rs:17:23: 17:44
          StorageDead(_7);                 // scope 2 at $DIR/separate_const_switch.rs:17:43: 17:44
          StorageDead(_6);                 // scope 0 at $DIR/separate_const_switch.rs:17:43: 17:44
-         _8 = discriminant(_2);           // scope 0 at $DIR/separate_const_switch.rs:14:11: 19:6
-         switchInt(move _8) -> [0_isize: bb4, otherwise: bb3]; // scope 0 at $DIR/separate_const_switch.rs:14:5: 19:6
+         _8 = const 1_isize;              // scope 0 at $DIR/separate_const_switch.rs:14:11: 19:6
+         switchInt(const 1_isize) -> [0_isize: bb4, otherwise: bb3]; // scope 0 at $DIR/separate_const_switch.rs:14:5: 19:6
      }
  
      bb2: {
          StorageLive(_4);                 // scope 0 at $DIR/separate_const_switch.rs:16:16: 16:17
          _4 = ((_1 as Ok).0: i32);        // scope 0 at $DIR/separate_const_switch.rs:16:16: 16:17
          StorageLive(_5);                 // scope 1 at $DIR/separate_const_switch.rs:16:44: 16:45
          _5 = _4;                         // scope 1 at $DIR/separate_const_switch.rs:16:44: 16:45
          Deinit(_2);                      // scope 1 at $DIR/separate_const_switch.rs:16:22: 16:46
          ((_2 as Continue).0: i32) = move _5; // scope 1 at $DIR/separate_const_switch.rs:16:22: 16:46
          discriminant(_2) = 0;            // scope 1 at $DIR/separate_const_switch.rs:16:22: 16:46
          StorageDead(_5);                 // scope 1 at $DIR/separate_const_switch.rs:16:45: 16:46
          StorageDead(_4);                 // scope 0 at $DIR/separate_const_switch.rs:16:45: 16:46
-         _8 = discriminant(_2);           // scope 0 at $DIR/separate_const_switch.rs:14:11: 19:6
-         switchInt(move _8) -> [0_isize: bb4, otherwise: bb3]; // scope 0 at $DIR/separate_const_switch.rs:14:5: 19:6
+         _8 = const 0_isize;              // scope 0 at $DIR/separate_const_switch.rs:14:11: 19:6
+         switchInt(const 0_isize) -> [0_isize: bb4, otherwise: bb3]; // scope 0 at $DIR/separate_const_switch.rs:14:5: 19:6
      }
  
      bb3: {
          StorageLive(_11);                // scope 0 at $DIR/separate_const_switch.rs:21:28: 21:29
          _11 = ((_2 as Break).0: usize);  // scope 0 at $DIR/separate_const_switch.rs:21:28: 21:29
          Deinit(_0);                      // scope 4 at $DIR/separate_const_switch.rs:21:34: 21:38
          discriminant(_0) = 0;            // scope 4 at $DIR/separate_const_switch.rs:21:34: 21:38
          StorageDead(_11);                // scope 0 at $DIR/separate_const_switch.rs:21:37: 21:38
          goto -> bb5;                     // scope 0 at $DIR/separate_const_switch.rs:21:37: 21:38
      }
  
      bb4: {
          StorageLive(_9);                 // scope 0 at $DIR/separate_const_switch.rs:20:31: 20:32
          _9 = ((_2 as Continue).0: i32);  // scope 0 at $DIR/separate_const_switch.rs:20:31: 20:32
          StorageLive(_10);                // scope 3 at $DIR/separate_const_switch.rs:20:42: 20:43
          _10 = _9;                        // scope 3 at $DIR/separate_const_switch.rs:20:42: 20:43
          Deinit(_0);                      // scope 3 at $DIR/separate_const_switch.rs:20:37: 20:44
          ((_0 as Some).0: i32) = move _10; // scope 3 at $DIR/separate_const_switch.rs:20:37: 20:44
          discriminant(_0) = 1;            // scope 3 at $DIR/separate_const_switch.rs:20:37: 20:44
          StorageDead(_10);                // scope 3 at $DIR/separate_const_switch.rs:20:43: 20:44
          StorageDead(_9);                 // scope 0 at $DIR/separate_const_switch.rs:20:43: 20:44
          goto -> bb5;                     // scope 0 at $DIR/separate_const_switch.rs:20:43: 20:44
      }
  
      bb5: {
          StorageDead(_2);                 // scope 0 at $DIR/separate_const_switch.rs:23:1: 23:2
          return;                          // scope 0 at $DIR/separate_const_switch.rs:23:2: 23:2
      }
  }