Class BoundVar

gil/std.impl.hpp:103–113

};

template <typename Name, typename Value> struct BoundVar {
  Name name;
  Value value;

  constexpr operator Value() const noexcept { return value; }
  constexpr auto operator&() const noexcept { return Ref{name}; }
  constexpr auto operator*() const noexcept { return value; }
  constexpr auto operator[](auto... params) const noexcept {
    return Var{bundle::Bundle{name, params...}};
  }
};

template <typename Var, typename Expr> struct Assign {
  Var var;