- // MIR for `multiple` before DataflowConstProp
+ // MIR for `multiple` after DataflowConstProp
  
  fn multiple(_1: bool, _2: u8) -> () {
      debug x => _1;
      debug i => _2;
      let mut _0: ();
      let _3: std::option::Option<u8>;
      let mut _4: bool;
      let mut _5: u8;
      let mut _7: isize;
      scope 1 {
          debug e => _3;
          let _6: u8;
          let _8: u8;
          scope 2 {
              debug x2 => _6;
              let _9: u8;
              scope 4 {
                  debug y => _9;
              }
          }
          scope 3 {
              debug i => _8;
          }
      }
  
      bb0: {
          StorageLive(_3);
          StorageLive(_4);
          _4 = copy _1;
          switchInt(move _4) -> [0: bb2, otherwise: bb1];
      }
  
      bb1: {
          StorageLive(_5);
          _5 = copy _2;
          _3 = Option::<u8>::Some(move _5);
          StorageDead(_5);
          goto -> bb3;
      }
  
      bb2: {
          _3 = Option::<u8>::None;
          goto -> bb3;
      }
  
      bb3: {
          StorageDead(_4);
          StorageLive(_6);
          _7 = discriminant(_3);
          switchInt(move _7) -> [0: bb5, 1: bb6, otherwise: bb4];
      }
  
      bb4: {
          unreachable;
      }
  
      bb5: {
          _6 = const 0_u8;
          goto -> bb7;
      }
  
      bb6: {
          StorageLive(_8);
          _8 = copy ((_3 as Some).0: u8);
          _6 = copy _8;
          StorageDead(_8);
          goto -> bb7;
      }
  
      bb7: {
          StorageLive(_9);
          _9 = copy _6;
          _0 = const ();
          StorageDead(_9);
          StorageDead(_6);
          StorageDead(_3);
          return;
      }
  }