- // MIR for `main` before GVN
+ // MIR for `main` after GVN
  
  fn main() -> () {
      let mut _0: ();
      let mut _1: i32;
  
      bb0: {
          StorageLive(_1);
          _1 = const 1_i32;
-         switchInt(copy _1) -> [1: bb2, otherwise: bb1];
+         switchInt(const 1_i32) -> [1: bb2, otherwise: bb1];
      }
  
      bb1: {
          _0 = foo(const -1_i32) -> [return: bb3, unwind unreachable];
      }
  
      bb2: {
          _0 = foo(const 0_i32) -> [return: bb3, unwind unreachable];
      }
  
      bb3: {
          StorageDead(_1);
          return;
      }
  }