- // MIR for `main` before GVN
+ // MIR for `main` after GVN
  
  fn main() -> () {
      let mut _0: ();
      let _1: char;
      let mut _2: main::InvalidChar;
      let mut _4: E;
      let mut _5: main::InvalidTag;
      let mut _7: Empty;
      let mut _8: main::NoVariants;
      scope 1 {
          debug _invalid_char => _1;
          let _3: [E; 1];
          scope 2 {
              debug _invalid_tag => _3;
              let _6: [Empty; 1];
              scope 3 {
                  debug _enum_without_variants => const [ZeroSized: Empty];
                  let _9: main::Str<"���">;
                  scope 4 {
                      debug _non_utf8_str => const Str::<"���">;
                  }
              }
          }
      }
  
      bb0: {
          StorageLive(_1);
          StorageLive(_2);
          _2 = InvalidChar { int: const 1114113_u32 };
          _1 = copy (_2.1: char);
          StorageDead(_2);
          StorageLive(_3);
          StorageLive(_4);
          StorageLive(_5);
          _5 = InvalidTag { int: const 4_u32 };
          _4 = copy (_5.1: E);
          _3 = [move _4];
          StorageDead(_4);
          StorageDead(_5);
          nop;
          nop;
          StorageLive(_8);
          _8 = NoVariants { int: const 0_u32 };
          nop;
          nop;
          nop;
          StorageDead(_8);
          nop;
          nop;
          nop;
          nop;
          StorageDead(_3);
          StorageDead(_1);
          return;
      }
  }