- // MIR for `dont_opt` before RemoveUnneededDrops
+ // MIR for `dont_opt` after RemoveUnneededDrops
  
  fn dont_opt(_1: Vec<bool>) -> () {
      debug x => _1;                       // in scope 0 at $DIR/remove_unneeded_drops.rs:+0:13: +0:14
      let mut _0: ();                      // return place in scope 0 at $DIR/remove_unneeded_drops.rs:+0:27: +0:27
      let _2: ();                          // in scope 0 at $DIR/remove_unneeded_drops.rs:+1:5: +1:12
      let mut _3: std::vec::Vec<bool>;     // in scope 0 at $DIR/remove_unneeded_drops.rs:+1:10: +1:11
      scope 1 (inlined std::mem::drop::<Vec<bool>>) { // at $DIR/remove_unneeded_drops.rs:9:5: 9:12
          debug _x => _3;                  // in scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL
      }
  
      bb0: {
          StorageLive(_2);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:5: +1:12
          StorageLive(_3);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:10: +1:11
          _3 = move _1;                    // scope 0 at $DIR/remove_unneeded_drops.rs:+1:10: +1:11
          drop(_3) -> [return: bb2, unwind: bb1]; // scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL
      }
  
      bb1 (cleanup): {
          resume;                          // scope 0 at $DIR/remove_unneeded_drops.rs:+0:1: +2:2
      }
  
      bb2: {
          StorageDead(_3);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:11: +1:12
          StorageDead(_2);                 // scope 0 at $DIR/remove_unneeded_drops.rs:+1:12: +1:13
          nop;                             // scope 0 at $DIR/remove_unneeded_drops.rs:+0:27: +2:2
          return;                          // scope 0 at $DIR/remove_unneeded_drops.rs:+2:2: +2:2
      }
  }