- // MIR for `float_to_exponential_common` before ConstProp
+ // MIR for `float_to_exponential_common` after ConstProp
  
  fn float_to_exponential_common(_1: &mut Formatter<'_>, _2: &T, _3: bool) -> Result<(), std::fmt::Error> {
      debug fmt => _1;
      debug num => _2;
      debug upper => _3;
      let mut _0: std::result::Result<(), std::fmt::Error>;
      let _4: bool;
      let mut _5: &std::fmt::Formatter<'_>;
      let mut _7: std::option::Option<usize>;
      let mut _8: &std::fmt::Formatter<'_>;
      let mut _9: isize;
      let mut _11: &mut std::fmt::Formatter<'_>;
      let mut _12: &T;
      let mut _13: core::num::flt2dec::Sign;
      let mut _14: u32;
      let mut _15: u32;
      let mut _16: usize;
      let mut _17: bool;
      let mut _18: &mut std::fmt::Formatter<'_>;
      let mut _19: &T;
      let mut _20: core::num::flt2dec::Sign;
      let mut _21: bool;
      scope 1 {
          debug force_sign => _4;
          let _6: core::num::flt2dec::Sign;
          scope 2 {
              debug sign => _6;
              scope 3 {
                  debug precision => _10;
                  let _10: usize;
              }
          }
      }
  
      bb0: {
          StorageLive(_4);
          StorageLive(_5);
          _5 = &(*_1);
          _4 = Formatter::<'_>::sign_plus(move _5) -> [return: bb1, unwind unreachable];
      }
  
      bb1: {
          StorageDead(_5);
          StorageLive(_6);
          switchInt(_4) -> [0: bb3, otherwise: bb2];
      }
  
      bb2: {
-         _6 = MinusPlus;
+         _6 = const MinusPlus;
          goto -> bb4;
      }
  
      bb3: {
-         _6 = Minus;
+         _6 = const Minus;
          goto -> bb4;
      }
  
      bb4: {
          StorageLive(_7);
          StorageLive(_8);
          _8 = &(*_1);
          _7 = Formatter::<'_>::precision(move _8) -> [return: bb5, unwind unreachable];
      }
  
      bb5: {
          StorageDead(_8);
          _9 = discriminant(_7);
          switchInt(move _9) -> [1: bb6, otherwise: bb8];
      }
  
      bb6: {
          _10 = ((_7 as Some).0: usize);
          StorageLive(_13);
          _13 = _6;
          StorageLive(_14);
          StorageLive(_15);
          _15 = _10 as u32 (IntToInt);
          _14 = Add(move _15, const 1_u32);
          StorageDead(_15);
          _0 = float_to_exponential_common_exact::<T>(_1, _2, move _13, move _14, _3) -> [return: bb7, unwind unreachable];
      }
  
      bb7: {
          StorageDead(_14);
          StorageDead(_13);
          goto -> bb10;
      }
  
      bb8: {
          StorageLive(_20);
          _20 = _6;
          _0 = float_to_exponential_common_shortest::<T>(_1, _2, move _20, _3) -> [return: bb9, unwind unreachable];
      }
  
      bb9: {
          StorageDead(_20);
          goto -> bb10;
      }
  
      bb10: {
          StorageDead(_6);
          StorageDead(_4);
          StorageDead(_7);
          return;
      }
  }