[Compiler.IR] [init]
    def sefFn (x_1 : obj) (x_2 : obj) : obj :=
      case x_1 : obj of
      Lean.Expr.app._impl →
        let x_3 : u64 := sproj[2, 0] x_1;
        let x_4 : obj := proj[0] x_1;
        let x_5 : obj := proj[1] x_1;
        block_6 (x_7 : u8) :=
          case x_7 : u8 of
          Bool.false →
            let x_8 : obj := Lean.Expr.app._override x_2 x_5;
            ret x_8
          Bool.true →
            ret x_1;
        let x_9 : usize := ptrAddrUnsafe ◾ x_4;
        let x_10 : usize := ptrAddrUnsafe ◾ x_2;
        let x_11 : u8 := USize.decEq x_9 x_10;
        case x_11 : u8 of
        Bool.false →
          jmp block_6 x_11
        Bool.true →
          let x_12 : usize := ptrAddrUnsafe ◾ x_5;
          let x_13 : u8 := USize.decEq x_12 x_12;
          jmp block_6 x_13
      default →
        ret x_1