- // MIR for `test` before GVN
+ // MIR for `test` after GVN
  
  fn test() -> () {
      let mut _0: ();
      let _1: &std::boxed::Box<()>;
      let _2: &std::boxed::Box<()>;
      let _3: std::boxed::Box<()>;
      let mut _6: *const ();
      let mut _8: *const [()];
      let mut _9: std::boxed::Box<()>;
      let mut _10: *const ();
      let mut _11: usize;
      scope 1 {
          debug vp_ctx => _1;
          let _4: *const ();
          scope 2 {
              debug slf => _10;
              let _5: *const [()];
              scope 3 {
                  debug bytes => _5;
                  let _7: *mut ();
                  scope 4 {
                      debug _x => _7;
                  }
                  scope 7 (inlined foo) {
                  }
              }
              scope 5 (inlined slice_from_raw_parts::<()>) {
                  scope 6 (inlined std::ptr::from_raw_parts::<[()], ()>) {
                  }
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
          StorageLive(_2);
          StorageLive(_3);
          _3 = Box::<()>::new(const ()) -> [return: bb1, unwind continue];
      }
  
      bb1: {
          _2 = &_3;
          _1 = copy _2;
          StorageDead(_2);
          StorageLive(_4);
-         _9 = deref_copy _3;
+         _9 = copy _3;
          _10 = copy ((_9.0: std::ptr::Unique<()>).0: std::ptr::NonNull<()>) as *const () (Transmute);
          _4 = copy _10;
-         StorageLive(_5);
+         nop;
          StorageLive(_6);
-         _6 = copy _4;
+         _6 = copy _10;
          StorageLive(_11);
          _11 = const 1_usize;
-         _5 = *const [()] from (copy _6, copy _11);
+         _5 = *const [()] from (copy _10, const 1_usize);
          StorageDead(_11);
          StorageDead(_6);
          StorageLive(_7);
          StorageLive(_8);
          _8 = copy _5;
-         _7 = copy _8 as *mut () (PtrToPtr);
+         _7 = copy ((_9.0: std::ptr::Unique<()>).0: std::ptr::NonNull<()>) as *mut () (Transmute);
          StorageDead(_8);
          StorageDead(_7);
-         StorageDead(_5);
+         nop;
          StorageDead(_4);
          drop(_3) -> [return: bb2, unwind: bb3];
      }
  
      bb2: {
          StorageDead(_3);
          StorageDead(_1);
          return;
      }
  
      bb3 (cleanup): {
          resume;
      }
  }