- // MIR for `foo` before ScalarReplacementOfAggregates
+ // MIR for `foo` after ScalarReplacementOfAggregates
  
  fn foo() -> () {
      let mut _0: ();
      let _1: Foo<T>;
      let mut _2: std::result::Result<std::boxed::Box<dyn std::fmt::Display>, <T as Err>::Err>;
      let mut _3: std::boxed::Box<dyn std::fmt::Display>;
      let mut _4: std::boxed::Box<u32>;
      let mut _7: isize;
      let _9: ();
      let _10: ();
      let mut _11: std::fmt::Arguments<'_>;
      let mut _13: &std::boxed::Box<dyn std::fmt::Display>;
      let mut _14: &u32;
      let mut _16: core::fmt::rt::Argument<'_>;
      let mut _17: &std::boxed::Box<dyn std::fmt::Display>;
      let mut _18: core::fmt::rt::Argument<'_>;
      let mut _19: &u32;
      let mut _20: &[&str; 3];
      let _21: &[&str; 3];
      let _22: [&str; 3];
      let mut _23: &[core::fmt::rt::Argument<'_>; 2];
      let _24: &[core::fmt::rt::Argument<'_>; 2];
      let mut _26: &std::boxed::Box<dyn std::fmt::Display>;
      let mut _27: &u32;
      let mut _28: bool;
      let mut _29: isize;
      let mut _30: isize;
      let mut _31: isize;
+     let _32: std::result::Result<std::boxed::Box<dyn std::fmt::Display>, <T as Err>::Err>;
+     let _33: u32;
      scope 1 {
-         debug foo => _1;
+         debug ((foo: Foo<T>).0: std::result::Result<std::boxed::Box<dyn std::fmt::Display>, <T as Err>::Err>) => _32;
+         debug ((foo: Foo<T>).1: u32) => _33;
          let _5: std::result::Result<std::boxed::Box<dyn std::fmt::Display>, <T as Err>::Err>;
          scope 2 {
              debug x => _5;
              let _6: u32;
              scope 3 {
                  debug y => _6;
                  scope 4 {
                      debug x => _8;
                      let _8: std::boxed::Box<dyn std::fmt::Display>;
                      let _12: (&std::boxed::Box<dyn std::fmt::Display>, &u32);
+                     let _34: &std::boxed::Box<dyn std::fmt::Display>;
+                     let _35: &u32;
                      scope 5 {
-                         debug args => _12;
+                         debug ((args: (&Box<dyn std::fmt::Display>, &u32)).0: &std::boxed::Box<dyn std::fmt::Display>) => _34;
+                         debug ((args: (&Box<dyn std::fmt::Display>, &u32)).1: &u32) => _35;
                          let _15: [core::fmt::rt::Argument<'_>; 2];
                          scope 6 {
                              debug args => _15;
                              let mut _25: &[&str; 3];
                          }
                      }
                  }
              }
          }
      }
  
      bb0: {
          _28 = const false;
-         StorageLive(_1);
+         StorageLive(_32);
+         StorageLive(_33);
+         nop;
          StorageLive(_2);
          StorageLive(_3);
          StorageLive(_4);
          _4 = Box::<u32>::new(const 5_u32) -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
          _3 = move _4 as std::boxed::Box<dyn std::fmt::Display> (PointerCoercion(Unsize, Implicit));
          StorageDead(_4);
          _2 = Result::<Box<dyn std::fmt::Display>, <T as Err>::Err>::Ok(move _3);
          StorageDead(_3);
-         _1 = Foo::<T> { x: move _2, y: const 7_u32 };
+         _32 = move _2;
+         _33 = const 7_u32;
+         nop;
          StorageDead(_2);
          StorageLive(_5);
          _28 = const true;
-         _5 = move (_1.0: std::result::Result<std::boxed::Box<dyn std::fmt::Display>, <T as Err>::Err>);
+         _5 = move _32;
          StorageLive(_6);
-         _6 = copy (_1.1: u32);
+         _6 = copy _33;
          _7 = discriminant(_5);
          switchInt(move _7) -> [0: bb2, otherwise: bb7];
      }
  
      bb2: {
          StorageLive(_8);
          _8 = move ((_5 as Ok).0: std::boxed::Box<dyn std::fmt::Display>);
          StorageLive(_9);
          StorageLive(_10);
          StorageLive(_11);
-         StorageLive(_12);
+         StorageLive(_34);
+         StorageLive(_35);
+         nop;
          StorageLive(_13);
          _13 = &_8;
          StorageLive(_14);
          _14 = &_6;
-         _12 = (move _13, move _14);
+         _34 = move _13;
+         _35 = move _14;
+         nop;
          StorageDead(_14);
          StorageDead(_13);
          StorageLive(_15);
          StorageLive(_16);
          StorageLive(_17);
-         _26 = deref_copy (_12.0: &std::boxed::Box<dyn std::fmt::Display>);
+         _26 = deref_copy _34;
          _17 = &(*_26);
          _16 = core::fmt::rt::Argument::<'_>::new_display::<Box<dyn std::fmt::Display>>(move _17) -> [return: bb3, unwind unreachable];
      }
  
      bb3: {
          StorageDead(_17);
          StorageLive(_18);
          StorageLive(_19);
-         _27 = deref_copy (_12.1: &u32);
+         _27 = deref_copy _35;
          _19 = &(*_27);
          _18 = core::fmt::rt::Argument::<'_>::new_display::<u32>(move _19) -> [return: bb4, unwind unreachable];
      }
  
      bb4: {
          StorageDead(_19);
          _15 = [move _16, move _18];
          StorageDead(_18);
          StorageDead(_16);
          StorageLive(_20);
          StorageLive(_21);
          _25 = const foo::<T>::promoted[0];
          _21 = &(*_25);
          _20 = &(*_21);
          StorageLive(_23);
          StorageLive(_24);
          _24 = &_15;
          _23 = &(*_24);
          _11 = core::fmt::rt::<impl Arguments<'_>>::new_v1::<3, 2>(move _20, move _23) -> [return: bb5, unwind unreachable];
      }
  
      bb5: {
          StorageDead(_24);
          StorageDead(_23);
          StorageDead(_21);
          StorageDead(_20);
          _10 = _eprint(move _11) -> [return: bb6, unwind unreachable];
      }
  
      bb6: {
          StorageDead(_11);
          StorageDead(_15);
-         StorageDead(_12);
+         StorageDead(_34);
+         StorageDead(_35);
+         nop;
          StorageDead(_10);
          _9 = const ();
          StorageDead(_9);
          _0 = const ();
          drop(_8) -> [return: bb8, unwind unreachable];
      }
  
      bb7: {
          _0 = const ();
          goto -> bb9;
      }
  
      bb8: {
          StorageDead(_8);
          goto -> bb9;
      }
  
      bb9: {
          StorageDead(_6);
          _29 = discriminant(_5);
          switchInt(move _29) -> [0: bb10, otherwise: bb11];
      }
  
      bb10: {
          _28 = const false;
          StorageDead(_5);
-         StorageDead(_1);
+         StorageDead(_32);
+         StorageDead(_33);
+         nop;
          return;
      }
  
      bb11: {
          drop(_5) -> [return: bb10, unwind unreachable];
      }
  }