Crash when inheriting with local_storage

[ArekPiekarz]

The following usage of derived te::poly with local_storage ends with a crash instead of printing "Circle":

#include "external/te/include/te.hpp"
#include <iostream>

struct Drawable : te::poly<Drawable, te::local_storage<16>> {
  using te::poly<Drawable, te::local_storage<16>>::poly;

  void draw(std::ostream &out) const {
    te::call([](auto const &self, auto &out) { self.draw(out); }, *this, out);
  }
};

struct Circle {
  void draw(std::ostream &out) const {
    out << "Circle\n";
  }
};

void draw(Drawable const &drawable) { drawable.draw(std::cout); }

int main() {
  draw(Circle{});
}

When we modify Circle to print its copy constructor:

struct Circle {
    Circle() = default;
    Circle(const Circle&) { std::cout << "Circle(const Circle&) ctor\n"; }
  void draw(std::ostream &out) const {
    out << "Circle\n";
  }
};

we get spammed with Circle(const Circle&) ctor in the console until it crashes.

Am I doing something wrong or is there a bug in te?

Environment OS: Ubuntu 17.10 x64 Compiler: GCC 7.2 x64